python复制代码x = [3,6,2,1,7,9]
x.sort()
print(x)
#输出为：[1,2,4,6,7,9]

python复制代码x = [4, 6, 2, 1, 7, 9]
y = x[:]
y.sort()
print(y)  # [1, 2, 4, 6, 7, 9]
print(x)  # [4, 6, 2, 1, 7, 9]

python复制代码x =[4, 6, 2, 1, 7, 9]
y = sorted(x)
print (y) #[1, 2, 4, 6, 7, 9]
print (x) #[4, 6, 2, 1, 7, 9]
#sorted返回一个有序的副本，并且类型总是列表，如下：
print (sorted('Python')) #['P', 'h', 'n', 'o', 't', 'y']

python复制代码x = ['mmm', 'mm', 'mm', 'm' ]
x.sort(key = len)
print (x) # ['m', 'mm', 'mm', 'mmm']

python复制代码y = [3, 2, 8 ,0 , 1]
y.sort(reverse = True)
print (y) #[8, 3, 2, 1, 0]
#True为倒序排列，False为正序排列

python复制代码l1 = [1,3,5,-2,-4,-6]
l2 = sorted(l1,key=abs)
print(l1)
print(l2)

python复制代码l = [[1,2],[3,4,5,6],(7,),'123']
print(sorted(l,key=len))

python复制代码a = [5,2,1,9,6]        
     
    >>> sorted(a)                  #将a从小到大排序,不影响a本身结构 
    [1, 2, 5, 6, 9] 
     
    >>> sorted(a,reverse = True)   #将a从大到小排序,不影响a本身结构 
    [9, 6, 5, 2, 1] 
     
    >>> a.sort()                   #将a从小到大排序,影响a本身结构 
    >>> a 
    [1, 2, 5, 6, 9] 
     
    >>> a.sort(reverse = True)     #将a从大到小排序,影响a本身结构 
    >>> a 
    [9, 6, 5, 2, 1] 
     
    注意，a.sort() 已改变其结构，b = a.sort() 是错误的写法! 

    >>> b = ['aa','BB','bb','zz','CC'] 
    >>> sorted(b) 
    ['BB', 'CC', 'aa', 'bb', 'zz']    #按列表中元素每个字母的ascii码从小到大排序,如果要从大到小,请用sorted(b,reverse=True)下同 
     
    >>> c =['CCC', 'bb', 'ffff', 'z']  
    >>> sorted(c,key=len)             #按列表的元素的长度排序 
    ['z', 'bb', 'CCC', 'ffff'] 
     
    >>> d =['CCC', 'bb', 'ffff', 'z'] 
    >>> sorted(d,key = str.lower )    #将列表中的每个元素变为小写，再按每个元素中的每个字母的ascii码从小到大排序 
    ['bb', 'CCC', 'ffff', 'z'] 
     
    >>> def lastchar(s): 
           return s[-1] 
    >>> e = ['abc','b','AAz','ef'] 
    >>> sorted(e,key = lastchar)      #自定义函数排序,lastchar为函数名，这个函数返回列表e中每个元素的最后一个字母 
    ['b', 'abc', 'ef', 'AAz']         #sorted(e,key=lastchar)作用就是 按列表e中每个元素的最后一个字母的ascii码从小到大排序 
     
    >>> f = [{'name':'abc','age':20},{'name':'def','age':30},{'name':'ghi','age':25}]     #列表中的元素为字典 
    >>> def age(s): 
           return s['age'] 
    >>> ff = sorted(f,key = age)      #自定义函数按列表f中字典的age从小到大排序  
     
    [{'age': 20, 'name': 'abc'}, {'age': 25, 'name': 'ghi'}, {'age': 30, 'name': 'def'}] 
     
    >>> f2 = sorted(f,key = lambda x:x['age'])    #如果觉得上面定义一个函数代码不美观，可以用lambda的形式来定义函数,效果同上

xml复制代码<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-actuator</artifactId>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

    <dependency>
        <groupId>io.micrometer</groupId>
        <artifactId>micrometer-registry-prometheus</artifactId>
    </dependency>
</dependencies>

yaml复制代码spring:
  application:
    name: prometheus-example
management:
  endpoints:
    web:
      exposure:
        include: "*"
  metrics:
    tags:
      application: ${spring.application.name}

java复制代码package com.git.hui.boot.prometheus.interceptor;

import io.prometheus.client.CollectorRegistry;
import io.prometheus.client.Counter;
import io.prometheus.client.Gauge;
import io.prometheus.client.Histogram;
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

/**
 * @author yihui
 * @date 2021/11/09
 */
@Component
public class PrometheusComponent implements ApplicationContextAware {
    private static PrometheusComponent instance;


    /**
     * 请求总数
     */
    private Counter reqCounter;

    /**
     * 正在请求的http数量
     */
    private Gauge duringReqGauge;

    /**
     * 直方图，请求分布情况
     */
    private Histogram reqLatencyHistogram;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        instance = this;
        CollectorRegistry collectorRegistry = applicationContext.getBean(CollectorRegistry.class);
        // 这里指定SpringBoot容器的CollectorRegistry，如果使用默认的会导致无法收集
        reqCounter = Counter.build().name("demo_rest_req_total").labelNames("path", "method", "code")
                .help("总的请求计数").register(collectorRegistry);
        duringReqGauge = Gauge.build()
                .name("demo_rest_inprogress_req").labelNames("path", "method")
                .help("正在处理的请求数").register(collectorRegistry);
        reqLatencyHistogram = Histogram.build().labelNames("path", "method", "code")
                .name("demo_rest_requests_latency_seconds_histogram").help("请求耗时分布")
                .register(collectorRegistry);
    }

    public static PrometheusComponent getInstance() {
        return instance;
    }

    public Counter counter() {
        return reqCounter;
    }

    public Gauge gauge() {
        return duringReqGauge;
    }

    public Histogram histogram() {
        return reqLatencyHistogram;
    }
}

java复制代码public class PrometheusInterceptor extends HandlerInterceptorAdapter {

    private ThreadLocal<Histogram.Timer> timerThreadLocal = new ThreadLocal<>();

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        // 正在处理的请求量
        PrometheusComponent.getInstance().gauge().labels(request.getRequestURI(), request.getMethod()).inc();

        timerThreadLocal.set(PrometheusComponent.getInstance().histogram()
                .labels(request.getRequestURI(), request.getMethod(), String.valueOf(response.getStatus()))
                .startTimer());
        return super.preHandle(request, response, handler);
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        String uri = request.getRequestURI();
        String method = request.getMethod();
        int status = response.getStatus();
        // count 请求计数，标签分别为 请求路径，请求方法，response http code
        // 请求应用总量:  sum(demo_rest_req_total)
        // 每秒http请求量: sum(rate(demo_rest_req_total[1m])
        // 请求topk的url:  topk(10, sum(demo_rest_req_total) by (path))
        PrometheusComponent.getInstance().counter().labels(uri, method, String.valueOf(status)).inc();

        // 请求完毕，计数器-1
        PrometheusComponent.getInstance().gauge().labels(uri, method).dec();

        // 直方图统计
        Histogram.Timer timer = timerThreadLocal.get();
        if (timer != null) {
            timer.observeDuration();
            timerThreadLocal.remove();
        }
        super.afterCompletion(request, response, handler, ex);
    }
}

java复制代码@RestController
@SpringBootApplication
public class Application implements WebMvcConfigurer {
    private Random random = new Random();

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new PrometheusInterceptor()).addPathPatterns("/**");
    }

    @GetMapping(path = "hello")
    public String hello(String name) {
        int sleep = random.nextInt(200);
        try {
            Thread.sleep(sleep);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        return "hello sleep: " + sleep + " for " + name;
    }

    public static void main(String[] args) {
        SpringApplication.run(Application.class);
    }

    @Bean
    MeterRegistryCustomizer<MeterRegistry> configurer(@Value("${spring.application.name}") String applicationName) {
        return (registry) -> registry.config().commonTags("application", applicationName);
    }

}

arduino复制代码curl http://127.0.0.1:8080/ping

bash复制代码curl http://127.0.0.1:8080/v1/id/test

bash复制代码curl http://127.0.0.1:8080/v1/snowid

bash复制代码grpcurl -plaintext -d '{"tag":"test"}' -import-path $HOME/src/id-maker/internal/controller/rpc/proto -proto segment.proto localhost:50051 proto.Gid/GetId

bash复制代码grpcurl -plaintext -import-path $HOME/src/id-maker/internal/controller/rpc/proto -proto segment.proto localhost:50051 proto.Gid/GetSnowId

ruby复制代码# Run MySQL
$ make compose-up

# Run app with migrations
$ make run

scss复制代码HTTP > usecase
       usecase > repository (Postgres)
       usecase < repository (Postgres)
HTTP < usecase

sql复制代码Error attempting to get column 'id' from result set. Cause:    
com.mysql.jdbc.exceptions.jdbc4.MySQLDataException: '2.156220742E9' in column '1' is outside valid range for the datatype INTEGER.

mysql复制代码CREATE TABLE `t_test`
(
    `id`               int(11) unsigned NOT NULL AUTO_INCREMENT COMMENT '主键',
    `biz_field`        varchar(255)     NOT NULL DEFAULT '' COMMENT '业务字段',
    `biz_field_unique` varchar(255)     NOT NULL DEFAULT '' COMMENT '业务字段（有唯一索引）',
    PRIMARY KEY (`id`),
    UNIQUE KEY `udx_t_test_biz_field_unique` (`biz_field_unique`)
) ENGINE = InnoDB
  AUTO_INCREMENT = 1
  DEFAULT CHARSET = utf8mb4 COMMENT ='测试表'

mysql复制代码<select id="getAllTest" resultType="TestPo">
    SELECT * FROM t_test
    WHERE biz_field = #{bizValue}
</select>

mysql复制代码<insert id="insertTest" parameterType="TestPo">
    -- 此处虽然有写id，但代码中 #{id} 未被赋值，所以一直都是用自增id
    INSERT INTO t_test(id, biz_field, biz_field_unique)
    VALUES (#{id}, #{bizField}, #{bizFieldUnique})
    ON DUPLICATE KEY
    UPDATE
        biz_field = #{bizField}
</insert>

kotlin复制代码//kotlin
class TestPo(
    /**
     * 主键id
     */
    var id: Int = 0,

    /**
     * 业务字段
     */
    var bizField: String = "",

    /**
     * 业务字段（有唯一索引）
     */
    var bizFieldUnique: String = ""
)

sql复制代码原文：'2.156220742E9' in column '1' is outside valid range for the datatype INTEGER.
译文：第一列的值 '2.156220742E9' 超出 INTEGER 类型的取值范围。

kotlin复制代码//kotlin
class TestPo(
    /**
     * 主键id，移除字段后，即使 select 出该字段，也不会报错
     */
    //var id: Int = 0,
    
    ...
)

mysql复制代码<select id="getAllTest" resultType="TestPo">
    --将select * 改成具体的字段，不包括有问题的字段id         
    SELECT biz_field,biz_field_unique 
    FROM t_test
    WHERE biz_field = #{bizValue}
</select>

kotlin复制代码//kotlin
class TestPo(
    /**
     * 主键id
     */
    var id: Long = 0
    
    ...

)

mysql复制代码sql-> select count(1) from t_test;
res-> 50000

mysql复制代码//伪代码
var data = "select * from t_test where biz_field_unique = uniqueValue"
if (data == null){
    "insert into t_test(biz_field, biz_field_unique) values ('value','uniqueValue')"
}else{
    "update t_test set biz_field = value where  biz_field_unique = uniqueValue"
}

mysql复制代码//伪代码
transaction.open //打开事务
var data = "select * from t_test where biz_field_unique = uniqueValue;"
if (data == null){
    "insert into t_test(biz_field, biz_field_unique) values ('value','uniqueValue');"
}else{
    "update t_test set biz_field = value where  biz_field_unique = uniqueValue;"
}
transaction.commit //提交事务

mysql复制代码//伪代码
transaction.open //打开事务
//select 语句加入 for update
var data = "select * from t_test where biz_field_unique = uniqueValue for update;" 
if (data == null){
    "insert into t_test(biz_field, biz_field_unique) values ('value','uniqueValue');"
}else{
    "update t_test set biz_field = value where  biz_field_unique = uniqueValue;"
}
transaction.commit //提交事务

mysql复制代码//伪代码
distributeLock.lock //获取分布式锁
var data = "select * from t_test where biz_field_unique = uniqueValue;"
if (data == null){
    "insert into t_test(biz_field, biz_field_unique) values ('value','uniqueValue');"
}else{
    "update t_test set biz_field = value where  biz_field_unique = uniqueValue;"
}
distributeLock.unlock //释放分布式锁

mysql复制代码//伪代码
//select 执行次数 21亿 100%
var data = "select * from t_test where biz_field_unique = uniqueValue;"
if (data == null){
    //insert 执行次数 5w 0.0024%
    "insert into t_test(biz_field, biz_field_unique) values ('value','uniqueValue');"
}else{
    //update 执行次数 21亿-5w 99.9976%
    "update t_test set biz_field = value where  biz_field_unique = uniqueValue;"
}

mysql复制代码//伪代码
//select
var data = "select * from t_test where biz_field_unique = uniqueValue;"
if (data == null){
    //insert into on duplicate key update
    "insert into t_test(biz_field, biz_field_unique) values ('value','uniqueValue') on duplicate key update biz_field = value;"
}else{
    //update
    "update t_test set biz_field = value where  biz_field_unique = uniqueValue;"
}

java复制代码public boolean tryLock(long waitTime, long leaseTime, TimeUnit unit)

scss复制代码RFuture<RedissonLockEntry> subscribeFuture = subscribe(threadId);
if (!subscribeFuture.await(time, TimeUnit.MILLISECONDS)) {
    if (!subscribeFuture.cancel(false)) {
        subscribeFuture.onComplete((res, e) -> {
            if (e == null) {
                unsubscribe(subscribeFuture, threadId);
            }
        });
    }
    acquireFailed(threadId);
    return false;
}

ini复制代码protected RFuture<Boolean> unlockInnerAsync(long threadId) {
    return commandExecutor.evalWriteAsync(getName(), LongCodec.INSTANCE, RedisCommands.EVAL_BOOLEAN,
            "if (redis.call('hexists', KEYS[1], ARGV[3]) == 0) then " +
                "return nil;" +
            "end; " +
            "local counter = redis.call('hincrby', KEYS[1], ARGV[3], -1); " +
            "if (counter > 0) then " +
                "redis.call('pexpire', KEYS[1], ARGV[2]); " +
                "return 0; " +
            "else " +
                "redis.call('del', KEYS[1]); " +
                "redis.call('publish', KEYS[2], ARGV[1]); " +
                "return 1; "+
            "end; " +
            "return nil;",
            Arrays.<Object>asList(getName(), getChannelName()), LockPubSub.UNLOCK_MESSAGE, internalLockLeaseTime, getLockName(threadId));

}

java复制代码/**
     * 导入表结构（保存）
     */
    @PreAuthorize("@ss.hasPermi('tool:gen:import')")
    @Log(title = "代码生成", businessType = BusinessType.IMPORT)
    @PostMapping("/importTable")
    public AjaxResult importTableSave(String tables)
    {
        // 通过调试，字符串tables格式为："my_user,table_name_1,table_name_2...."
        String[] tableNames = Convert.toStrArray(tables);
        // tableNames: ["my_user", "table_name_1", "table_name_2"]
        // 查询表信息
        List<GenTable> tableList = genTableService.selectDbTableListByNames(tableNames);
        // 见下图
        genTableService.importGenTable(tableList);
        return AjaxResult.success();
    }

sql复制代码SELECT
	table_name,
	table_comment,
	create_time,
	update_time
FROM
	information_schema. TABLES
WHERE
	table_name NOT LIKE 'qrtz_%'
AND table_name NOT LIKE 'gen_%'
AND table_schema = (SELECT DATABASE())
AND table_name IN ('my_user')

java复制代码/**
     * 导入表结构
     * 
     * @param tableList 导入表列表
     */
    @Override
    @Transactional
    public void importGenTable(List<GenTable> tableList)
    {
        // tableList: [{my_user表的信息}]
        // admin
        String operName = SecurityUtils.getUsername();
        try
        {
            for (GenTable table : tableList)
            {
                String tableName = table.getTableName(); // tableName: my_user
                GenUtils.initTable(table, operName);
                int row = genTableMapper.insertGenTable(table);
                if (row > 0)
                {
                    // 保存列信息
                    List<GenTableColumn> genTableColumns = genTableColumnMapper.selectDbTableColumnsByName(tableName);
                    for (GenTableColumn column : genTableColumns)
                    {
                        GenUtils.initColumnField(column, table);
                        genTableColumnMapper.insertGenTableColumn(column);
                    }
                }
            }
        }
        catch (Exception e)
        {
            throw new ServiceException("导入失败：" + e.getMessage());
        }
    }

sql复制代码SELECT
	column_name,
	(
		CASE
		WHEN (
			is_nullable = 'no' && column_key != 'PRI'
		) THEN
			'1'
		ELSE
			NULL
		END
	) AS is_required,
	(
		CASE
		WHEN column_key = 'PRI' THEN
			'1'
		ELSE
			'0'
		END
	) AS is_pk,
	ordinal_position AS sort,
	column_comment,
	(
		CASE
		WHEN extra = 'auto_increment' THEN
			'1'
		ELSE
			'0'
		END
	) AS is_increment,
	column_type
FROM
	information_schema. COLUMNS
WHERE
	table_schema = (SELECT DATABASE())
AND table_name = 'my_user'
	ORDER BY
		ordinal_position

复制代码 我本人项目需要的是 php5.6 的版本 并且是laravel的项目 运行在homestead的集成环境中

bash复制代码 wget  http://pecl.php.net/get/mongo-1.6.16.tgz  （此扩展适用于 php5.6） 下载路径为 /var/bin 下载（下载路径可以自己定义）

复制代码 sudo tar -zxvf mongo-1.6.16.tgz （加不加sudo需要看自己用户的权限 有权限就不需要加）

bash复制代码 cd mongo-1.6.16

arduino复制代码 sudo /usr/bin/phpize5.6     (这里写的路径是自己环境中的 phpize 文件所在的路径，我的环境是通过homestead进行搭建的所以 phpize 文件在这个目录下并且有对应的版本号),
 如果不知道自己的 phpize 文件所在的位置 可以通过命令进行查找  find / -name phpize

javascript复制代码 sudo ./configure --with-php-config=/usr/bin/php-config5.6  （这里的路径也是自己环境下文件所有位置的路径，也可以通过上面的方法进行查找）

go复制代码 sudo make  或者 sudo make install

bash复制代码 cd /etc/php/5.6/fpm/  （本人环境下的php安装路径，根据自己的安装位置进行切换）

复制代码 sudo vim php.ini

ini复制代码 extension = "mongo.so" (如果你是高版本的php，这里应该是 mongodb.so，我的版本是php5.6 )

复制代码 sudo service php5.6-fpm restart   （运行自己相应版本的文件）

java复制代码interface IMessage{
	public void print();
}
class MessageImpl implements IMessage{//定义接口实现类
	public void print(){
		System.out.println("Hello World");
	}
}
class Demo{
	public static void get(IMessage msg){//接受接口对象
		msg.print();
	}
}
public class TestDemo1{
	public static void main(String args[]){
		IMessage msg = new MessageImpl();//子类为接口实例化
		Demo.get(msg);//传递msg对象
	}
}

java复制代码interface IMessage{
	public void print();
}
class Demo{
	public static void get(IMessage msg){//接受接口对象
		msg.print();
	}
}
public class TestDemo1{
	public static void main(String args[]){
		IMessage msg = new IMessage(){//匿名内部类
			public void print(){
				System.out.println("hello,world!");
			}
		};
		Demo.get(msg);//传递msg对象
	}
}

java复制代码abstract class Message{
	public void print(){
		System.out.print(this.getInfo());
	}
	public abstract String getInfo();
}
class Demo{
	public static void get(Message msg){//接受接口对象
		msg.print();
	}
}
public class TestDemo1{
	public static void main(String args[]){
		Demo.get(new Message(){
			public String getInfo(){
				return "www.baidu.com";
			}
		});//传递msg对象
	}
}

java复制代码class Person{
	private String name;
	private int age;
	public Person(String name, int age){
		this.name = name;
		this.age = age;
	}
	public String toString(){
		return "name = " + this.name + ",age = " + this.age ;
	}
}

public class TestDemo2{
	public static void main(String args[]){
		Person p = new Person("zsr",18);
		System.out.print(p.toString());
	}
}

java复制代码class Person{
	private String name;
	private int age;
	public Person(String name, int age){
		this.name = name;
		this.age = age;
	}
	public boolean equals(Object anObject){
		if(anObject == null){
			return false;
		}
		if(this == anObject){
			return true;
		}
		//判断anObject的实例是不是Person
		if( !(anObject instanceof Person)){
			return false;
		}
		//必须将Object类型变为Person类型后才可以调用name和age属性
		Person per = (Person) anObject;
		return this.name.equals(per.name) && this.age == per.age;
	}
	public String toString(){//覆写Object类方法
		return "name = " + this.name + ",age = " + this.age ;
	}
}

public class TestDemo3{
	public static void main(String args[]){
		Person per1 = new Person("zsr",18);
		Person per2 = new Person("zsr",18);
		//true
		System.out.println(per1.equals(per2));
		//false
		System.out.println(per1.equals("Hello,world!"));
	}
}

java复制代码public class TestDemo4{
	public static void main(String args[]){
		Object obj = new int []{1,3,4};
		int data [] = (int [])obj;//向下转型
		for(int i = 0 ;i < data.length ; i++){
			System.out.println(data[i]);
		}
	}
}

java复制代码interface Message{}
class MessageImpl implements Message{//定义接口子类
	public String toString(){
		return "Hello World";
	}
}
public class TestDemo5{
	public static void main(String args[]){
		Message msg = new MessageImpl();//向上转型
		Object obj = msg;//向上转型
		Message temp = (Message) obj;//向下转型
		System.out.println(temp);//toString()
	}
}

java复制代码class MyInt{
	private int num;//基本类
	public MyInt(int num){
		this.num=num;
	}
	public int intValue(){
		return this.num;
	}
}
public class TestDemo6{
	public static void main(String args[]){
		Object obj = new MyInt(10);//子类自动变为Object父类对象
		MyInt temp = (MyInt) obj;//向下转型
		int result = temp.intValue();
		System.out.println(result*result);
	}
}

java复制代码public class TestDemo{
	public static void main(String args[]){
		Integer var = new Integer(10);//装箱
		int result = var.intValue();//拆箱
		System.out.println(result*result);
	}
}

java复制代码public class TestDemo{
	public static void main(String args[]){
		Double var = new Double(10.0);//装箱
		double result = var.doubleValue();//拆箱
		System.out.println(result*result);
	}
}

java复制代码public class TestDemo{
	public static void main(String args[]){
		Integer var = 10;//自动装箱
		int result = var;//自动拆箱
        //可以直接利用包装类进行对象操作
		System.out.println(++var*result);//自动进行数学运算
	}
}

java复制代码public class TestDemo{
	public static void main(String args[]){
		Integer x = new Integer(10);//新空间
		Integer y = 10;//入池
		Integer z = 10;
		System.out.println(x==y);//false
		System.out.println(x==z);//false
		System.out.println(y==z);//ture
		System.out.println(x.equals(y));//ture
	}
}

java复制代码public class TestDemo{
	public static void main(String args[]){
		String str = "16";
		int result = Integer.parseInt(str);//String ——>int
		System.out.println(result*result);
	}
}

java复制代码public class TestDemo{
	public static void main(String args[]){
		String str = "16.";
		double result = Double.parsedouble(str);//String ——>int
		System.out.println(result*result);
	}
}

java复制代码public class TestDemo{
	public static void main(String args[]){
		String str = "true";
		boolean result = Boolean.parseboolean(str);//String ——>int
		System.out.println(result);
	}
}

java复制代码public class TestDemo{
	public static void main(String args[]){
		int num = 100;
		String str = num+"";//int——>String //会产生垃圾
		System.out.println(str.length());
	}
}
//会有垃圾产生

java复制代码public class BaoZhuangLei{
	public static void main(String args[]){
		int num = 100;
		String str =String.valueOf(num);//int——>String
		System.out.println(str.length());
	}
}

java复制代码package cn.mldn.demo;//定义包
public class Hello{
	public static void main(String args[]){
		System.out.println("Hello World");
	}
}

java复制代码//定义一个Message
package cn.mldn.util;//打包
class Massage{
	public String print(){
		return "Hello World";
	}
}

java复制代码//定义另外一个类使用Message类
package cn.mldn.text;//打包
import cn.mldn.util.Message;//导入包
public class Text{
	public static void main(String args[]){
		Massage msg = new cn.mldn.util.Massage();
		System.out.println(msg.print());
	}
}

java复制代码Text.java:5: 错误: Massage在cn.mldn.util中不是公共的; 无法从外部程序包中对其进行
访问
                Massage msg = new cn.mldn.util.Massage();
                ^

java复制代码package cn.mldn.util;//打包
public class Massage{
	public String print(){
		return "Hello World";
	}
}

java复制代码package cn.mldn.text;//打包
import cn.mldn.util.*;//导入包
public class Text{
	public static void main(String args[]){
		Massage msg = new cn.mldn.util.Massage();
		System.out.println(msg.print());
	}
}

java复制代码package cn.mldn.text;//打包
import cn.mldn.util.*;//导入包
import cn.mldn.info.*;//导入包
public class Text{
	public static void main(String args[]){
		Message msg = new cn.mldn.util.Message();
		System.out.println(msg.print());
	}
}
/*
Text.java:6: 错误: 对Message的引用不明确, cn.mldn.info中的类 cn.mldn.info.Messag
e和cn.mldn.util中的类 cn.mldn.util.Message都匹配
                Message msg = new cn.mldn.util.Message();
                ^
*/

java复制代码package cn.mldn.text;//打包
import cn.mldn.util.*;//导入包
import cn.mldn.info.*;//导入包
public class Text{
	public static void main(String args[]){
		cn.mldn.util.Message msg = new cn.mldn.util.Message();
		System.out.println(msg.print());
	}
}

java复制代码package cn.sxau.demo.a;
public class Info {
//protected权限
	protected String str = "www.baidu.com";

}

java复制代码package cn.sxau.demo.a;
import cn.sxau.demo.a.Info;
public class SubInfo extends Info{
	public void print(){
		System.out.println(super.str);
	}
}

java复制代码package cn.sxau.testab;
import cn.sxau.demo.a.SubInfo;
public class TestInfo{
	public static void main(String args[]){
		new SubInfo().print();
	}
}

java复制代码package cn.sxau.testab;
import cn.sxau.demo.a.Info;
public class TestInfo{
	public static void main(String args[]){
		System.out.println(new Info().str);
	}
}
/*
F:\java\javabase\day09>javac -d . TestInfo.java
TestInfo.java:5: 错误: str 在 Info 中是 protected 访问控制
                System.out.println(new Info().str);
                                             ^
1 个错误
*/

java复制代码package cn.sxau.util;//打包
public class Message{
	public String print(){
		return "hello world";
	}
}

java复制代码//定义一个测试类 调用my.jar
package cn.sxau.test;
public class MyTest{
	public static void main(String args[]){
		cn.sxau.util.Message msg = new cn.sxau.util.Message();
		System.out.println(msg.print());
	}
}
/*
执行
F:\java\javabase\day09>java cn.sxau.test.MyTest
hello world
*/

xml复制代码<definitions id="definitions"
  targetNamespace="http://flowable.org/bpmn20"
  xmlns:flowable="http://flowable.org/bpmn"
  xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL">

    <process id="financialReport" name="Monthly financial report reminder process">

      <startEvent id="theStart" />

      <sequenceFlow id="flow1" sourceRef="theStart" targetRef="writeReportTask" />

      <userTask id="writeReportTask" name="Write monthly financial report" >
        <documentation>
          Write monthly financial report for publication to shareholders.
        </documentation>
        <potentialOwner>
          <resourceAssignmentExpression>
            <formalExpression>accountancy</formalExpression>
          </resourceAssignmentExpression>
        </potentialOwner>
      </userTask>

      <sequenceFlow id="flow2" sourceRef="writeReportTask" targetRef="verifyReportTask" />

      <userTask id="verifyReportTask" name="Verify monthly financial report" >
        <documentation>
          Verify monthly financial report composed by the accountancy department.
          This financial report is going to be sent to all the company shareholders.
        </documentation>
        <potentialOwner>
          <resourceAssignmentExpression>
            <formalExpression>management</formalExpression>
          </resourceAssignmentExpression>
        </potentialOwner>
      </userTask>

      <sequenceFlow id="flow3" sourceRef="verifyReportTask" targetRef="theEnd" />

      <endEvent id="theEnd" />

    </process>

</definitions>

java复制代码package org.flowable;

import org.flowable.engine.*;
import org.flowable.engine.history.HistoricActivityInstance;
import org.flowable.engine.impl.cfg.StandaloneProcessEngineConfiguration;
import org.flowable.engine.repository.Deployment;
import org.flowable.engine.runtime.ProcessInstance;
import org.flowable.task.api.Task;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class FinancialReport {
    public static void main(String[] args) {
        // 1. 流程引擎
        // 1.1 流程引擎 配置
        ProcessEngineConfiguration cfg = new StandaloneProcessEngineConfiguration()
                .setJdbcUrl("jdbc:h2:~/flowable-db/engine-db;AUTO_SERVER=TRUE;AUTO_SERVER_PORT=9093;DB_CLOSE_DELAY=-1")
                .setJdbcUsername("flowable")
                .setJdbcPassword("flowable")
                .setJdbcDriver("org.h2.Driver")
                .setDatabaseSchemaUpdate(ProcessEngineConfiguration.DB_SCHEMA_UPDATE_TRUE);
        // 1.2 构建流程引擎
        ProcessEngine processEngine = cfg.buildProcessEngine();

        // 2. 流程定义
        // 2.1 将 流程定义文件 部署到 流程引擎 中
        RepositoryService repositoryService = processEngine.getRepositoryService();
        Deployment deployment = repositoryService.createDeployment()
                .addClasspathResource("FinancialReportProcess.bpmn20.xml")
                .deploy();
        
    }
}

bash复制代码java -jar flowable-ui.war

java复制代码package org.flowable;

import org.flowable.engine.*;
import org.flowable.engine.history.HistoricActivityInstance;
import org.flowable.engine.history.HistoricProcessInstance;
import org.flowable.engine.impl.cfg.StandaloneProcessEngineConfiguration;
import org.flowable.engine.repository.Deployment;
import org.flowable.engine.runtime.ProcessInstance;
import org.flowable.task.api.Task;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class FinancialReport {
    public static void main(String[] args) {
        // 1. 流程引擎
        // 1.1 流程引擎 配置
        ProcessEngineConfiguration cfg = new StandaloneProcessEngineConfiguration()
                .setJdbcUrl("jdbc:h2:~/flowable-db/engine-db;AUTO_SERVER=TRUE;AUTO_SERVER_PORT=9093;DB_CLOSE_DELAY=-1")
                .setJdbcUsername("flowable")
                .setJdbcPassword("flowable")
                .setJdbcDriver("org.h2.Driver")
                .setDatabaseSchemaUpdate(ProcessEngineConfiguration.DB_SCHEMA_UPDATE_TRUE);
        // 1.2 构建流程引擎
        ProcessEngine processEngine = cfg.buildProcessEngine();

        // 2. 流程定义
        // 2.1 将 流程定义文件 部署到 流程引擎 中
//        RepositoryService repositoryService = processEngine.getRepositoryService();
//        Deployment deployment = repositoryService.createDeployment()
//                .addClasspathResource("FinancialReportProcess.bpmn20.xml")
//                .deploy();
        // 3. 启动流程
        RuntimeService runtimeService = processEngine.getRuntimeService();
        String procId = runtimeService.startProcessInstanceByKey("financialReport").getId();

        // 4. 领取任务
        TaskService taskService = processEngine.getTaskService();
        List<Task> tasks = taskService.createTaskQuery().taskCandidateGroup("accountancy").list();
        for (Task task : tasks) {
            System.out.println("Following task is available for accountancy group: " + task.getName());

            // claim it
            taskService.claim(task.getId(), "jalon");
        }

        // 查看领取的任务
        tasks = taskService.createTaskQuery().taskAssignee("jalon").list();
        for (Task task : tasks) {
            System.out.println("Task for jalon: " + task.getName());

            // Complete the task
            taskService.complete(task.getId());
        }

        System.out.println("Number of tasks for jalon: "
                + taskService.createTaskQuery().taskAssignee("jalon").count());

        // 5. 经理领取任务
        tasks = taskService.createTaskQuery().taskCandidateGroup("management").list();
        for (Task task : tasks) {
            System.out.println("Following task is available for management group: " + task.getName());
            taskService.claim(task.getId(), "tangyuan");
        }

        // 6. 完成任务
        for (Task task : tasks) {
            taskService.complete(task.getId());
        }

        // 7. 查看任务是否完成
        HistoryService historyService = processEngine.getHistoryService();
        HistoricProcessInstance historicProcessInstance =
                historyService.createHistoricProcessInstanceQuery().processInstanceId(procId).singleResult();
        System.out.println("Process instance end time: " + historicProcessInstance.getEndTime());
    }
}