java复制代码/**
 *示例代码
 */
public class HelloLoader {
    public static void main(String[] args) {
        System.out.println("Hello World!");
    }
}

java复制代码clazz.getClassLoader()

java复制代码	Thread.currentThread().getContextClassLoader()

java复制代码ClassLoader.getSystemClassLoader()

java复制代码DriverManager.getCallerClassLoader()

java复制代码package java.lang;

/**
 * @Description 这是我们自己定义的Stirng，和java官方的String同包同名
 * @Author XiaoLin
 * @Date 2021/8/28 16:14
 */
public class String {
    // 在对象初始化之前就会执行
  static {
    System.out.println("我是XiaoLin定义的String");
  }
  
}

java复制代码package cn.linstudy;

/**
 * @Description
 * @Author XiaoLin
 * @Date 2021/8/28 16:15
 */
public class TestString {

  public static void main(String[] args) {
    java.lang.String str = new java.lang.String();
    System.out.println("我是XiaoLin");
  }
}

java复制代码package java.lang;

/**
 * @Description 这是我们自己定义的Stirng，和java官方的String同包同名
 * @Author XiaoLin
 * @Date 2021/8/28 16:14
 */
public class String {
  static {
    System.out.println("我是XiaoLin定义的String");
  }

  public static void main(String[] args) {
    System.out.println("Hello XiaoLin");
  }
}

java复制代码package java.lang;

/**
 * @Description
 * @Author XiaoLin
 * @Date 2021/8/28 16:34
 */
public class SweetCode {

  public static void main(String[] args) {
    System.out.println("Hello SweetCode");
  }
}

typescript复制代码public class Product {
    ArrayList<String> parts = new ArrayList<String>();

    public void add(String part) {
        parts.add(part);
    }

    public void show() {
        System.out.println(parts);
    }
}

c复制代码PFS_PAGE_SIZE  // 每个page的大小, global_thread_container中默认为256
PFS_PAGE_COUNT // page的最大个数，global_thread_container中默认为256

class PFS_buffer_scalable_container {
  PFS_cacheline_atomic_size_t m_monotonic;            // 单调递增的原子变量，用于无锁选择page
  PFS_cacheline_atomic_size_t m_max_page_index;       // 当前已分配的最大page index
  size_t m_max_page_count;                            // 最大page个数，超过后将不再分配新page
  std::atomic<array_type *> m_pages[PFS_PAGE_COUNT];  // page数组
  native_mutex_t m_critical_section;                  // 创建新page时需要的一把锁
}

ini复制代码value_type *allocate(pfs_dirty_state *dirty_state) {
  current_page_count = m_max_page_index.m_size_t.load();
  
  monotonic = m_monotonic.m_size_t.load();
  monotonic_max = monotonic + current_page_count;
  while (monotonic < monotonic_max) {
    index = monotonic % current_page_count;
    array = m_pages[index].load();
    pfs = array->allocate(dirty_state);
    if  (pfs) {
      // 分配成功返回
      return pfs;
    } else {
      // 分配失败，尝试下一个page， 
      // 因为m_monotonic是并发累加的，这里有可能本地monotonic变量并不是线性递增的，有可能是从1 直接变为 3或更大，
      // 所以当前while循环并不是严格轮训所有page，很大可能是跳着尝试，换者说这里并发访问下大家一起轮训所有的page。
      // 这个算法其实是有些问题的，会导致某些page被跳过忽略，从而加剧扩容新page的几率，后面会详细分析。
      monotonic = m_monotonic.m_size_t++;
    }
  }
  
  // 轮训所有Page后没有分配成功，如果没有达到上限的话，开始扩容page
  while (current_page_count < m_max_page_count) {
    // 因为是并发访问，为了避免同时去创建新page，这里有一个把同步锁，也是整个PFS内存分配唯一的锁
    native_mutex_lock(&m_critical_section);
    // 拿锁成功，如果array已经不为null，说明已经被其它线程创建成功
    array = m_pages[current_page_count].load();
    if (array == nullptr) {
      // 抢到了创建page的责任
      m_allocator->alloc_array(array);
      m_pages[current_page_count].store(array);
      ++m_max_page_index.m_size_t;
    }
    native_mutex_unlock(&m_critical_section);
    
    // 在新的page中再次尝试分配
    pfs = array->allocate(dirty_state);
    if (pfs) {
      // 分配成功并返回
      return pfs;
    }
    // 分配失败，继续尝试创建新的page直到上限
  }
}

arduino复制代码class PFS_buffer_default_array {
PFS_cacheline_atomic_size_t m_monotonic;      // 单调递增原子变量，用来选择free的record
size_t m_max;                                 // record的最大个数
T *m_ptr;                                     // record对应的PFS对象，比如PFS_thread
}

ini复制代码value_type *allocate(pfs_dirty_state *dirty_state) {
  // 从m_monotonic记录的位置开始尝试轮序查找
  monotonic = m_monotonic.m_size_t++;
  monotonic_max = monotonic + m_max;

  while (monotonic < monotonic_max) {
    index = monotonic % m_max;
    pfs = m_ptr + index;
  
    // m_lock是pfs_lock结构，free/dirty/allocated三状态是由这个数据结构来维护的
    // 后面会详细介绍它如何实现原子状态迁移的
    if (pfs->m_lock.free_to_dirty(dirty_state)) {
      return pfs;
    }
    // 当前record不为free,原子变量++尝试下一个
    monotonic = m_monotonic.m_size_t++;
  }
}

objectivec复制代码// 下面3个宏主要就是用来位操作的，方便操作state或version
#define VERSION_MASK 0xFFFFFFFC
#define STATE_MASK 0x00000003
#define VERSION_INC 4

bool free_to_dirty(pfs_dirty_state *copy_ptr) {
  uint32 old_val = m_version_state.load();

  // 判断当前state是否为FREE，如果不是，直接返回失败
  if ((old_val & STATE_MASK) != PFS_LOCK_FREE) {
    return false;
  }

  uint32 new_val = (old_val & VERSION_MASK) + PFS_LOCK_DIRTY;

  // 当前state为free，尝试将state修改为dirty，atomic_compare_exchange_strong属于乐观锁，多个线程可能同时
  // 修改该原子变量，但只有1个修改成功。
  bool pass =
      atomic_compare_exchange_strong(&m_version_state, &old_val, new_val);

  if (pass) {
    // free to dirty 成功
    copy_ptr->m_version_state = new_val;
  }

  return pass;
}

void dirty_to_allocated(const pfs_dirty_state *copy) {
  /* Make sure the record was DIRTY. */
  assert((copy->m_version_state & STATE_MASK) == PFS_LOCK_DIRTY);
  /* Increment the version, set the ALLOCATED state */
  uint32 new_val = (copy->m_version_state & VERSION_MASK) + VERSION_INC +
                   PFS_LOCK_ALLOCATED;

  m_version_state.store(new_val);
}

scss复制代码struct pfs_lock {
  void allocated_to_free(void) {
    /*
      If this record is not in the ALLOCATED state and the caller is trying
      to free it, this is a bug: the caller is confused,
      and potentially damaging data owned by another thread or object.
    */
    uint32 copy = copy_version_state();
    /* Make sure the record was ALLOCATED. */
    assert(((copy & STATE_MASK) == PFS_LOCK_ALLOCATED));
    /* Keep the same version, set the FREE state */
    uint32 new_val = (copy & VERSION_MASK) + PFS_LOCK_FREE;

    m_version_state.store(new_val);
  }
}

ini复制代码while (monotonic < monotonic_max) {
    index = monotonic % current_page_count;
    array = m_pages[index].load();
    pfs = array->allocate(dirty_state);
    if  (pfs) {
       // 记录分配成功的index
       m_monotonic.m_size_t.store(index);
      return pfs;
    } else {
      // 局部变量递增，避免掉并发累加而跳过某些pages
      monotonic++;
    }
  }

ini复制代码# 创建虚拟网络
resource "azurerm_virtual_network" "vnet" {
    name                = "myTFVnet"
    address_space       = ["10.0.0.0/16"]
    location            = "westus2"
    resource_group_name = azurerm_resource_group.rg.name
}

bash复制代码#预览部署计划，查看改变项
$terraform plan

bash复制代码#应用部署计划
$terraform apply

bash复制代码$terraform show

go复制代码var var_name *var-type

go复制代码var ip *int        /* 指向整型*/
var fp *float32    /* 指向浮点型 */

go复制代码func main() {
   var a int= 20   /* 声明实际变量 */
   var ip *int        /* 声明指针变量 */

   ip = &a  /* 指针变量的存储地址 */
   fmt.Printf("a 变量的地址是: %x\n", &a  )
   /* 指针变量的存储地址 */
   fmt.Printf("ip 变量的存储地址: %x\n", ip )
   /* 使用指针访问值 */
   fmt.Printf("*ip 变量的值: %d\n", *ip )
}

go复制代码a 变量的地址是: 20818a220
ip 变量的存储地址: 20818a220
*ip 变量的值: 20

go复制代码type name int8
type first struct {
	a int
	b bool
	name
}

func main() {
	a := new(first)
	a.a = 1
	a.name = 11
	fmt.Println(a.b, a.a, a.name)
}

go复制代码false 1 11

go复制代码type name int8
type first struct {
	a int
	b bool
	name
}

func main() {
	var a = first{1, false, 2}
	var b *first = &a
	fmt.Println(a.b, a.a, a.name, &a, b.a, &b, (*b).a)
}

go复制代码false 1 2 &{1 false 2} 1 0xc042068018 1

go复制代码ptr := &v    // v的类型为T       取v的地址   其实就是把v的地址引用给了ptr,此时v和ptr指向了同一块内存地址,任一变量值的修改都会影响另一个变量的值

go复制代码func main() {
   var a int = 10   
   fmt.Printf("变量a的地址: %x\n", &a  )
   b := &a
   fmt.Printf("变量b: %v\n", b  )
   fmt.Printf("变量b的地址: %v\n", &b  )
}

less复制代码变量a的地址: 0x20818a220
变量b: 0x20818a220
变量b的地址: 0x263e94530

go复制代码func main() {
	//指针取值
	a := 10
	b := &a // 取变量a的地址，将指针保存到b中
	fmt.Printf("type of b:%T\n", b)
	c := *b // 指针取值（根据指针去内存取值）
	fmt.Printf("type of c:%T\n", c)
	fmt.Printf("value of c:%v\n", c)
}

go复制代码type of b:*int
type of c:int
value of c:10

go复制代码func change(val *int) {  
    *val = 55
}
func main() {  
    a := 58
    fmt.Println("value of a before function call is",a)
    b := &a
    change(b)
    fmt.Println("value of a after function call is", a)
}

go复制代码value of a before function call is 58  
value of a after function call is 55

go复制代码func modify(arr *[3]int) {  
    (*arr)[0] = 90
}

func main() {  
    a := [3]int{89, 90, 91}
    modify(&a)
    fmt.Println(a)
}

csharp复制代码[90 90 91]

go复制代码func modify(arr *[3]int) {  
    arr[0] = 90
}

func main() {  
    a := [3]int{89, 90, 91}
    modify(&a)
    fmt.Println(a)
}

csharp复制代码[90 90 91]

go复制代码func modify(sls []int) {  
    sls[0] = 90
}

func main() {  
    a := [3]int{89, 90, 91}
    modify(a[:])
    fmt.Println(a)
}

csharp复制代码[90 90 91]

go复制代码func main() {
	b := [...]int{109, 110, 111} p := &b p++ 
}

nvalid operation: p++ (non-numeric type *[3]int)

go复制代码const MAX int = 3

func main() {
   a := []int{10,100,200}
   var i int
   var ptr [MAX]*int;

   for  i = 0; i < MAX; i++ {
      ptr[i] = &a[i] /* 整数地址赋值给指针数组 */
   }

   for  i = 0; i < MAX; i++ {
      fmt.Printf("a[%d] = %d\n", i,*ptr[i] )
   } 
}
结果
a[0] = 10
a[1] = 100
a[2] = 200

go复制代码func main() {

   var a int
   var ptr *int
   var pptr **int

   a = 3000

   /* 指针 ptr 地址 */
   ptr = &a

   /* 指向指针 ptr 地址 */
   pptr = &ptr

   /* 获取 pptr 的值 */
   fmt.Printf("变量 a = %d\n", a )
   fmt.Printf("指针变量 *ptr = %d\n", *ptr )
   fmt.Printf("指向指针的指针变量 **pptr = %d\n", **pptr)
}
结果
变量 a = 3000
指针变量 *ptr = 3000
指向指针的指针变量 **pptr = 3000

go复制代码package main

import "fmt"

func main() {
   /* 定义局部变量 */
   var a int = 100
   var b int= 200

   fmt.Printf("交换前 a 的值 : %d\n", a )
   fmt.Printf("交换前 b 的值 : %d\n", b )

   /* 调用函数用于交换值
   * &a 指向 a 变量的地址
   * &b 指向 b 变量的地址
   */
   swap(&a, &b);

   fmt.Printf("交换后 a 的值 : %d\n", a )
   fmt.Printf("交换后 b 的值 : %d\n", b )
}

func swap(x *int, y *int) {
   var temp int
   temp = *x    /* 保存 x 地址的值 */
   *x = *y      /* 将 y 赋值给 x */
   *y = temp    /* 将 temp 赋值给 y */
}
结果
交换前 a 的值 : 100
交换前 b 的值 : 200
交换后 a 的值 : 200
交换后 b 的值 : 100

go复制代码if(ptr != nil)     /* ptr 不是空指针 */
if(ptr == nil)    /* ptr 是空指针 */

go复制代码func main() {
   var sp *string
   *sp = "张三"
   fmt.Println(*sp)
}

go复制代码panic: runtime error: invalid memory address or nil pointer dereference

go复制代码func main() {
   var s string
   fmt.Printf("%p\n",&s)
}

go复制代码// The new built-in function allocates memory. The first argument is a type,
// not a value, and the value returned is a pointer to a newly
// allocated zero value of that type.
func new(Type) *Type

go复制代码func main() {
	a := new(int)
	b := new(bool)
	fmt.Printf("%T\n", a) // *int
	fmt.Printf("%T\n", b) // *bool
	fmt.Println(*a)       // 0
	fmt.Println(*b)       // false
}

go复制代码func make(t Type, size ...IntegerType) Type

go复制代码// makemap implements Go map creation for make(map[k]v, hint).
func makemap(t *maptype, hint int, h *hmap) *hmap{
  //省略无关代码
}

go复制代码// A header for a Go map.
type hmap struct {
   // Note: the format of the hmap is also encoded in cmd/compile/internal/gc/reflect.go.
   // Make sure this stays in sync with the compiler's definition.
   count     int // # live cells == size of map.  Must be first (used by len() builtin)
   flags     uint8
   B         uint8  // log_2 of # of buckets (can hold up to loadFactor * 2^B items)
   noverflow uint16 // approximate number of overflow buckets; see incrnoverflow for details
   hash0     uint32 // hash seed
   buckets    unsafe.Pointer // array of 2^B Buckets. may be nil if count==0.
   oldbuckets unsafe.Pointer // previous bucket array of half the size, non-nil only when growing
   nevacuate  uintptr        // progress counter for evacuation (buckets less than this have been evacuated)
   extra *mapextra // optional fields
}

go复制代码m:=make(map[string]int,10)

xml复制代码<!DOCTYPE html>

<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>(自适应手机版)黄色响应式车行汽车租赁网站模板 二手车销售出租公司网站</title>
    <meta name="keywords" content="汽车租赁模板,二手车网站模板" />
  
</head>

<body>
    <header class="index-header">
        <div class="index-head">
            <div class="wd1200"> <a href="/518/" class="logo"> <img src="/518/style/images/logo.png" alt="(自适应手机版)黄色响应式车行汽车租赁网站模板 二手车销售出租公司网站模板下载 - AB模板网"> </a>
                <ul class="nav">
                    <li><a href="/518/index.html" target="_self">首 页</a> </li>

                    <li><a href="/518/about/">关于我们</a></li>

                    <li><a href="/518/car/">车辆展示</a></li>

                    <li><a href="/518/news/">新闻资讯</a></li>

                    <li><a href="/518/case/">客户案例</a></li>

                    <li><a href="/518/siji/">专业司机</a></li>

                    <li><a href="/518/yuyue/">在线预约</a></li>

                    <li><a href="/518/contact/">联系我们</a></li>

                </ul>

                <!-- 手机端导航 -->

                <div class="m-header"> <span class="box"> <span class="line line1"></span> <span class="line line2"></span> <span class="line line3"></span> </span>
                </div>
                <div class="m-header-menu">
                    <div class="m-menu-top f-cb"> <a href="/518/" class="fl title"><img src="/518/style/images/logo2.png" alt="(自适应手机版)黄色响应式车行汽车租赁网站模板 二手车销售出租公司网站模板下载 - AB模板网" /></a> <span class="fr close"></span> </div>
                    <div class="m-header-list">
                        <ul>
                            <li> <a class="col-box" href="/S437/" target="_self"> <span class="tit">首 页</span> </a> </li>

                            <li> <a class="col-box" href="/518/about/" target="_self"> <span class="tit">关于我们</span> </a> </li>

                            <li> <a class="col-box" href="/518/car/" target="_self"> <span class="tit">车辆展示</span> </a> </li>

                            <li> <a class="col-box" href="/518/news/" target="_self"> <span class="tit">新闻资讯</span> </a> </li>

                            <li> <a class="col-box" href="/518/case/" target="_self"> <span class="tit">客户案例</span> </a> </li>

                            <li> <a class="col-box" href="/518/siji/" target="_self"> <span class="tit">专业司机</span> </a> </li>

                            <li> <a class="col-box" href="/518/yuyue/" target="_self"> <span class="tit">在线预约</span> </a> </li>

                            <li> <a class="col-box" href="/518/contact/" target="_self"> <span class="tit">联系我们</span> </a> </li>

                        </ul>
                    </div>
                    <div class="m-header-menu-sub">
                        <div class="boxs"></div>
                        <div class="boxs"></div>
                        <div class="boxs"></div>
                        <div class="boxs"></div>
                        <div class="boxs"></div>
                        <div class="boxs"></div>
                        <div class="boxs"></div>
                    </div>
                </div>
                <div class="m-shadow"></div>

                <!-- 手机端导航 -->

            </div>
        </div>
        <div class="swiper-container index-banner-swiper">
            <div class="swiper-wrapper">
                <div class="swiper-slide"> <img src="/518/uploads/allimg/210729/1-210H92019370-L.jpg" alt="幻灯片3"> </div>
                <div class="swiper-slide"> <img src="/518/uploads/allimg/210729/1-210H92019230-L.jpg" alt="幻灯片2"> </div>
                <div class="swiper-slide"> <img src="/518/uploads/allimg/210729/1-210H9201Z70-L.jpg" alt="幻灯片1"> </div>

            </div>
            <div class="swiper-pagination"></div>
        </div>
    </header>
    <div class="index-search wow bounceInUp">
        <div class="wd1200">
            <div class="key"> <img src="/518/style/images/icon_hot.png" alt="" class="icon">
                <div class="word"> <span class="title">搜索关键词：</span>
                    <div>

                        <a href='/518/car/c1/'>豪华型</a>

                        <a href='/518/car/c2/'>舒适型</a>

                        <a href='/518/car/c3/'>经济型</a>

                        <a href='/518/car/c4/'>越野SUV</a>

                        <a href='/518/car/c5/'>客车型</a>

                    </div>
                </div>
            </div>
            <form name="formsearch" action="/518/plus/search.php">
                <div class="search-box">
                    <div class="input">
                        <input type="text" name="q" id="kw" placeholder="请输入关键词" />
                    </div>
                    <div class="button">
                        <button type="submit"> <img src="/518/style/images/icon_search.png" alt=""> </button>
                    </div>
                </div>
            </form>
        </div>
    </div>
    <div class="index-show">
        <div class="wd1200">
            <div class="index-Title">
                <div class="title wow slideInUp">车辆展示</div>
                <div class="intro wow slideInUp">给予客户清晰完美的用车解决方案！</div>
                <div class="line wow slideInUp"></div>
            </div>
            <div class="show-nav wow slideInUp">
                <ul>
                    <li class="li-active"> <a href="/518/car/">全部车型</a> </li>

                    <li><a href="/518/car/c1/">豪华型</a></li>

                    <li><a href="/518/car/c2/">舒适型</a></li>

                    <li><a href="/518/car/c3/">经济型</a></li>

                    <li><a href="/518/car/c4/">越野SUV</a></li>

                    <li><a href="/518/car/c5/">客车型</a></li>

                </ul>
            </div>
            <div class="show-contain">
                <div class="show-box wow slideInUp">
                    <div class="picture"> <img src="/518/uploads/allimg/210730/1-162L31146-F30.jpg" alt="迈巴赫"> </div>
                    <div class="info">
                        <div class="name">迈巴赫</div>
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                        <div class="photo"><img src='/518/uploads/allimg/210730/1-162L31146-6317.jpg'><img src='/518/uploads/allimg/210730/1-162L31146-2637.jpg'><img src='/518/uploads/allimg/210730/1-162L31146-F30.jpg'></div>
                        <div class="bot"> <a href="/518/car/c1/23.html" class="detail">查看详细+</a>
                            <div>￥<strong>1200</strong>/天</div>
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                    </div>
                </div>

                <div class="show-car wow slideInUp">
                    <a href="/518/car/c3/22.html" class="car-item">
                        <div class="tu"> <img src="/518/uploads/allimg/210730/1-162L30923-9619.jpg" alt="宝马7系"> </div>
                        <div class="info"> <span>宝马7系</span>
                            <div>￥<strong>800</strong>/天</div>
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                        <div class="info"> <span>奔驰S级</span>
                            <div>￥<strong>800</strong>/天</div>
                        </div>
                    </a>
                    <a href="/518/car/c1/1.html" class="car-item">
                        <div class="tu"> <img src="/518/uploads/allimg/210728/1-162JP205-5921.jpg" alt="奥迪"> </div>
                        <div class="info"> <span>奥迪</span>
                            <div>￥<strong>600</strong>/天</div>
                        </div>
                    </a>

                </div>
            </div>
        </div>
    </div>
    <div class="index-reason">
        <div class="index-Title">
            <div class="title wow slideInUp">选择我们的 <strong style="color: #3186E0 ;">四大理由</strong></div>
            <div class="intro wow slideInUp">给予客户清晰完美的解决方案！</div>
            <div class="line wow slideInUp"></div>
        </div>
        <div class="reason-nav wd1200 wow slideInUp">
            <ul>
                <li class='li-active'>
                    <div class="sanjiao"></div>
                    <img src="/518/style/images/ly1.png" alt="" class="icon icon1"> <img src="/518/style/images/ly1_h.png" alt="" class="icon icon2">
                    <div class="word">
                        <div class="title">实力雄厚</div>
                        <div class="intro">16年租车经验</div>
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                    <img src="/518/style/images/ly2.png" alt="" class="icon icon1"> <img src="/518/style/images/ly2_h.png" alt="" class="icon icon2">
                    <div class="word">
                        <div class="title">质高价优</div>
                        <div class="intro">合理的价格</div>
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                <li>
                    <div class="sanjiao"></div>
                    <img src="/518/style/images/ly3.png" alt="" class="icon icon1"> <img src="/518/style/images/ly3_h.png" alt="" class="icon icon2">
                    <div class="word">
                        <div class="title">完善服务</div>
                        <div class="intro">优质服务体系</div>
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                    <img src="/518/style/images/ly4.png" alt="" class="icon icon1"> <img src="/518/style/images/ly4_h.png" alt="" class="icon icon2">
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            <div class="wd1200">Copyright &copy; 2021 通用企业汽车租赁有限公司<a href="https://beian.miit.gov.cn/" target="_blank" rel="nofollow">苏ICP12345678</a> <a href="/sitemap.xml" target="_blank">XML地图</a></div>
        </div>
    </footer>
    <img src="/518/style/images/go-top.png" alt="" id="go-top">
    <script src="/518/style/js/swiper.min.js"></script>
    <script src="/518/style/js/common.js"></script>
    <script src="/518/style/js/wow.js"></script>
    <script>
        $(function() {
            $('#tj2').click(function() {
                //alert(1)
                if ($('#name2').val() == '') {
                    alert('请输入您的姓名！');
                    $("#name2").focus();
                    return false;
                }
                if ($("#tel2").val() == "") {
                    alert("请输入你的手机！");
                    $("#tel2").focus();
                    return false;
                }
                if (!$("#tel2").val().match(/^(((13[0-9]{1})|(14[0-9]{1})|(15[0-9]{1})|(16[0-9]{1})|(17[0-9]{1})|(18[0-9]{1})|(19[0-9]{1}))+\d{8})$/)) {
                    alert("手机号码格式不正确！");
                    $("#tel2").focus();
                    return false;
                }
            })
        })
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    <script type="text/javascript">
        (function() {

            $("#marquee4").kxbdMarquee({
                direction: "up",
                isEqual: false
            });

        })();
    </script>
</body>

</html>

css复制代码header .index-head .wd1200 {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

header .index-head .wd1200 .logo img {
    height: 65px;
}

header .index-head .wd1200 .nav {
    display: flex;
    align-items: center;
}

header .index-head .wd1200 .nav li {
    height: 90px;
    padding: 0 20px;
    border-bottom: 3px solid transparent;
    transition: 0.3s;
}

header .index-head .wd1200 .nav li a {
    font-size: 16px;
    transition: 0.3s;
    color: #fff
}

header .index-head .wd1200 .nav .li-active {
    border-bottom: 3px solid #3186E0;
}

java复制代码 package com.lizba.p3;

/**
 * <p>
 *		同步方法和同步代码块示例代码
 * </p>
 *
 * @Author: Liziba
 * @Date: 2021/6/15 22:13
 */
public class Synchronized {

    public static void main(String[] args) {

        // 同步代码块
        synchronized (Synchronized.class) {

        }
        // 静态方法
        method();
    }

    public static synchronized void method() {}

}

arduino复制代码javap -v Synchronized.class

scss复制代码// 使用while循环检测变量的值
while (flag) {
		// 防止一直执行，未满足条件进行短暂睡眠
		Thread.sleep(1000);
}
doSomething();

java复制代码public final native void notify();
public final native void notifyAll();
public final void wait() throws InterruptedException
public final native void wait(long timeout) throws InterruptedException;
public final void wait(long timeout, int nanos) throws InterruptedException

java复制代码package com.lizba.p3;

import com.lizba.p2.SleepUtil;

import java.text.SimpleDateFormat;
import java.util.Date;

/**
 * <p>
 *		wait()和notify()/notifyAll()示例代码
 * </p>
 *
 * @Author: Liziba
 * @Date: 2021/6/15 23:28
 */
public class WaitNotify {

    static boolean flag = true;
    static Object lock = new Object();
    static final SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss");

    public static void main(String[] args) {
        Thread waitThread = new Thread(new Wait(), "waitThread");
        waitThread.start();
        SleepUtil.sleepSecond(1);
        Thread notifyThread = new Thread(new Notify(), "notifyThread");
        notifyThread.start();
    }


    /**
     * wait线程，当条件不满足时wait()
     */
    static class Wait implements Runnable{

        @Override
        public void run() {
            // 加锁
            synchronized(lock) {
                // 当条件不满足时，继续wait
                while (flag) {
                    System.out.println(Thread.currentThread()
                            + " flag is true. wait at " +sdf.format(new Date()));
                    try {
                        // 此操作会释放锁
                        lock.wait();
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }

                // 满足条件是完成工作
                System.out.println(Thread.currentThread()
                        + " flag is false. finished at " + sdf.format(new Date()));
            }
        }
    }

    static class Notify implements Runnable {

        @Override
        public void run() {
            // 加锁
            synchronized (lock) {
                // 获取到锁或通知等待在锁上的线程
                // 通知不会释放锁，直到当前线程执行完释放lock锁后，waitThread才能从wait方法返回
                System.out.println(Thread.currentThread()
                        + "hold lock. notify at " + sdf.format(new Date()));
                lock.notifyAll();
                flag = false;
                SleepUtil.sleepSecond(5);
            }
            // 再次加锁
            synchronized (lock) {
                System.out.println(Thread.currentThread()
                        + "hold lock again. notify at " + sdf.format(new Date()));
                SleepUtil.sleepSecond(5);
            }
        }
    }

}

scss复制代码// 示例等待方伪代码
synchronized(对象) {
	while(条件不满足) {
    	对象.wait();
    }
    // ToDo...
}

scss复制代码// 示例通知方伪代码
synchronized(对象) {
    改变条件
    对象.notifyAll();
}

java复制代码package com.lizba.p3;

import java.io.IOException;
import java.io.PipedReader;
import java.io.PipedWriter;

/**
 * <p>
 *      管道流
 * </p>
 *
 * @Author: Liziba
 * @Date: 2021/6/16 21:07
 */
public class Piped {

    public static void main(String[] args) throws IOException {
        PipedWriter out = new PipedWriter();
        PipedReader in = new PipedReader();
        // 输入输出流连接（不连接会报错）
        out.connect(in);
        Thread printThread = new Thread(new Print(in), "PrintThread");
        printThread.start();

        // 输入
        int receive = 0;
        try {
            while ((receive = System.in.read()) != -1) {
                out.write(receive);
            }
        } finally {
            out.close();
        }
    }



    /**
     * 单个字符读取并输出
     *
     */
    static class Print implements Runnable {
        private PipedReader in;

        public Print(PipedReader in) {
            this.in = in;
        }

        @Override
        public void run() {
            int receive = 0;
            try {
                 while (true) {
                     // 单个字符读取
                    if ((receive = in.read()) != -1){
                        System.out.print((char)receive);
                    }
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

}

shell复制代码##　输入
hello liziba
##　输出
hello liziba

java复制代码public final void join() throws InterruptedException
// 下面两个具有超时等待，线程再给定的时间没有返回，那么超时的方法会返回
public final synchronized void join(long millis, int nanos)
public final synchronized void join(long millis)

java复制代码package com.lizba.p3;

import com.lizba.p2.SleepUtil;

import java.util.concurrent.TimeUnit;

/**
 * <p>
 *     join()等待通知机制
 * </p>
 *
 * @Author: Liziba
 * @Date: 2021/6/16 21:25
 */
public class Join {

    public static void main(String[] args) {
        // 前一个线程
        Thread previous = Thread.currentThread();
        for (int i = 0; i < 10; i++) {
            Thread t = new Thread(new Domino(previous), String.valueOf(i));
            t.start();
            previous = t;
        }
        SleepUtil.sleepSecond(5);
        System.out.println(Thread.currentThread().getName() + " end.");

    }

    static class Domino implements Runnable {
        private Thread thread;

        public Domino(Thread thread) {
            this.thread = thread;
        }

        @Override
        public void run() {
            try {
                thread.join();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            System.out.println(Thread.currentThread().getName() + " end.");
        }
    }

}

arduino复制代码 public final synchronized void join(long millis)
    throws InterruptedException {
        long base = System.currentTimeMillis();
        long now = 0;

        if (millis < 0) {
            throw new IllegalArgumentException("timeout value is negative");
        }
		// 超时等待时间未设置则为0，也就是join()方法
        if (millis == 0) {
            // 判断当前线程是否终止
            while (isAlive()) {
                // 如果未终止，继续wait()
                wait(0);
            }
        } else {
             // 判断当前线程是否终止
            while (isAlive()) {
                long delay = millis - now;
                // 判断超时等待时间是否已经到了，如果到了则返回
                if (delay <= 0) {
                    break;
                }
                // 否则继续等待，计算新的时间传入
                wait(delay);
                now = System.currentTimeMillis() - base;
            }
        }
    }


// 尝试判断当前线程时候已经执行完毕（是否还活着）
public final native boolean isAlive();

typescript复制代码package com.lizba.p3;

import com.lizba.p2.SleepUtil;

/**
 * <p>
 *
 * </p>
 *
 * @Author: Liziba
 * @Date: 2021/6/16 22:04
 */
public class Profiler {

    private static final ThreadLocal<Long> TIME_THREAD_LOCAL = new ThreadLocal<Long>() {
        @Override
        protected Long initialValue() {
            return System.currentTimeMillis();
        }
    };


    public static final void begin() {
        TIME_THREAD_LOCAL.set(System.currentTimeMillis());
    }

    public static final Long end() {
        return System.currentTimeMillis() - TIME_THREAD_LOCAL.get();
    }


    public static void main(String[] args) {
        Profiler.begin();
        SleepUtil.sleepSecond(1);
        System.out.println("Cost: " + Profiler.end());
    }
}

bash复制代码wget https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v1.0.0/deploy/static/provider/baremetal/deploy.yaml

bash复制代码kubectl apply -f v1.0.0-deploy.yaml

bash复制代码#查看相关pod状态
kubectl get pods -n ingress-nginx -owide
#查看service
kubectl get service -n ingress-nginx

yaml复制代码apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-deployment
spec:
  selector:
    matchLabels:
      app: backend
  replicas: 3
  template:
    metadata:
      labels:
        app: backend
    spec:
      containers:
      - name: nginx
        image: nginx:latest
        resources:
          limits:
            memory: "128Mi"
            cpu: "128m"
        ports:
        - containerPort: 80

yaml复制代码apiVersion: v1
kind: Service
metadata:
  name: nginx-service
spec:
  #定义后端pod标签为app=backend
  selector:
    app: backend
  ports:
  #service端口号
  - port: 80
    #pod的端口号
    targetPort: 80

bash复制代码kubectl apply -f nginx-service.yaml
kubectl apply -f nginx-nodeport-service.yaml

bash复制代码#查看service状况
kubectl get svc
#访问服务
curl http://10.96.45.195

yaml复制代码apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: nodeport-ingress
  namespace: default
spec:
  rules:
  - host: aa.bb.cc
    http:
      paths:
      - pathType: Prefix
        path: /
        backend:
          service:
            name: nginx-service
            port:
              number: 80

bash复制代码#创建ingress资源
kubectl apply -f nodeport-ingress.yaml
#检查ingress资源
kubectl get ingress

bash复制代码#第一种方案可以在对应Node上设置host文件
echo '172.21.122.231 aa.bb.cc' >> /etc/hosts
curl aa.bb.cc:32368
#使用curl方式
curl -v http://172.21.122.231:32368 -H 'host: aa.bb.cc'

bash复制代码kubectl delete -f v.1.0.0-deploy.yaml
kubectl delete -f nginx-nodeport-service.yaml
kubectl delete -f nodeport-ingress.yaml

bash复制代码kubectl label nodes demo-work-1 ingress=nginx

yaml复制代码apiVersion: apps/v1
kind: DaemonSet
metadata:
  labels:
    helm.sh/chart: ingress-nginx-4.0.1
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/instance: ingress-nginx
    app.kubernetes.io/version: 1.0.0
    app.kubernetes.io/managed-by: Helm
    app.kubernetes.io/component: controller
  name: ingress-nginx-controller
  namespace: ingress-nginx
spec:
  selector:
    matchLabels:
      app.kubernetes.io/name: ingress-nginx
      app.kubernetes.io/instance: ingress-nginx
      app.kubernetes.io/component: controller
  revisionHistoryLimit: 10
  minReadySeconds: 0
  template:
    metadata:
      labels:
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/instance: ingress-nginx
        app.kubernetes.io/component: controller
    spec:
      dnsPolicy: ClusterFirst
      containers:
        - name: controller
          image: willdockerhub/ingress-nginx-controller:v1.0.0
          imagePullPolicy: IfNotPresent
          lifecycle:
            preStop:
              exec:
                command:
                  - /wait-shutdown
          args:
            - /nginx-ingress-controller
            - --election-id=ingress-controller-leader
            - --controller-class=k8s.io/ingress-nginx
            - --configmap=$(POD_NAMESPACE)/ingress-nginx-controller
            - --validating-webhook=:8443
            - --validating-webhook-certificate=/usr/local/certificates/cert
            - --validating-webhook-key=/usr/local/certificates/key
            - --watch-ingress-without-class=true  # 新增
          securityContext:
            capabilities:
              drop:
                - ALL
              add:
                - NET_BIND_SERVICE
            runAsUser: 101
            allowPrivilegeEscalation: true
          env:
            - name: POD_NAME
              valueFrom:
                fieldRef:
                  fieldPath: metadata.name
            - name: POD_NAMESPACE
              valueFrom:
                fieldRef:
                  fieldPath: metadata.namespace
            - name: LD_PRELOAD
              value: /usr/local/lib/libmimalloc.so
          livenessProbe:
            failureThreshold: 5
            httpGet:
              path: /healthz
              port: 10254
              scheme: HTTP
            initialDelaySeconds: 10
            periodSeconds: 10
            successThreshold: 1
            timeoutSeconds: 1
          readinessProbe:
            failureThreshold: 3
            httpGet:
              path: /healthz
              port: 10254
              scheme: HTTP
            initialDelaySeconds: 10
            periodSeconds: 10
            successThreshold: 1
            timeoutSeconds: 1
          ports:
            - name: http
              containerPort: 80
              protocol: TCP
            - name: https
              containerPort: 443
              protocol: TCP
            - name: webhook
              containerPort: 8443
              protocol: TCP
          volumeMounts:
            - name: webhook-cert
              mountPath: /usr/local/certificates/
              readOnly: true
          resources:
            requests:
              cpu: 100m
              memory: 90Mi
      nodeSelector:
        ingress: nginx
      hostNetwork: true
      serviceAccountName: ingress-nginx
      terminationGracePeriodSeconds: 300
      volumes:
        - name: webhook-cert
          secret:
            secretName: ingress-nginx-admission

bash复制代码#部署ingress-nginx
kubectl apply -f v1.0.0-deploy.yaml
#查看相关pod状态
kubectl get pods -n ingress-nginx -owide
#查看service
kubectl get service -n ingress-nginx

yaml复制代码apiVersion: v1
kind: Service
metadata:
  name: nginx-service
spec:
  #定义后端pod标签为app=backend
  selector:
    app: backend
  ports:
  #service端口号
  - port: 80
    #pod的端口号
    targetPort: 80

bash复制代码#创建nginx-service
kubectl apply -f nginx-service.yaml
#检查资源状况
kubectl get svc
#资源的绑定情况
kubectl describe service nginx-service
#通过curl访问
curl 10.96.53.148

yaml复制代码apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: nodeport-ingress
  namespace: default
spec:
  rules:
  - host: aa.bb.cc
    http:
      paths:
      - pathType: Prefix
        path: /
        backend:
          service:
            name: nginx-service
            port:
              number: 80

bash复制代码#创建ingress
kubectl apply -f hostnetwork-ingress.yaml
#检查ingress资源
kubectl get ingress

bash复制代码curl -v http://172.21.122.231 -H 'host: aa.bb.cc'