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多线程Lesson

demo01

Race

package com.kaung.demo01;

//模拟龟兔赛跑
public class Race implements  Runnable{

    //胜利者
    private  static String winner;

    @Override
    public void run() {
        for (int i = 1; i <= 100; i++) {

            //模拟兔子休息
            if (Thread.currentThread().getName().equals("兔子====") && i%16==0){
                try {
                    Thread.sleep(1);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }

            //判断比赛是否结束
            boolean flag = gameOver(i);
            //如果比赛结束了就停止程序
            if (flag){
                break;
            }

            System.out.println(Thread.currentThread().getName()+"跑了"+i+"步");
        }
    }

    //判断是否完成比赛
    private boolean gameOver(int steps){
        //判断是否有胜利者
        if (winner != null){//已经存在胜利者了
            return true;
        }{
            if (steps>=100){
                winner = Thread.currentThread().getName();
                System.out.println("winner is"+winner);
                return true;
            }
        }
        return  false;
    }


    public static void main(String[] args) {
        Race race = new Race();

        new Thread(race,"兔子====").start();
        new Thread(race,"乌龟").start();
    }

}

tt1

package com.kaung.demo01;

//创建线程方式1:继承Thread类, 重写run()方法, 调用start开启线程

//总结:注意, 线程开启不一定立即执行, 由CPU调度执行
public class TestThread1 extends Thread{
    @Override
    public void run() {
        //run方法线程体
        for (int i = 0; i < 20; i++) {
            System.out.println("我在看代码------------"+i);
        }
    }

    public static void main(String[] args) {
        //main线程, 主线程

        //创建一个线程对象
        TestThread1 thread1 = new TestThread1();

        //调用strat()方法开启线程
        thread1.start();

        for (int i = 0; i < 20; i++) {
            System.out.println("我在学习多线程"+i);
        }
    }
}

tt2

package com.kaung.demo01;

import org.apache.commons.io.FileUtils;

import java.io.File;
import java.io.IOException;
import java.net.URL;

//练习Thread,实现多线程同步下载图片
public class TestThread2 implements Runnable{

    private String url;//网络图片地址
    private String name;//保存的文件名

    public TestThread2(String url,String name){
        this.url = url;
        this.name = name;
    }

    //下载图片线程的执行体
    @Override
    public void run() {
        WebDownloader webDownloader = new WebDownloader();
        webDownloader.downloader(url,name);
        System.out.println("下载了文件名为"+name);
    }

    public static void main(String[] args) {
        TestThread2 t1 = new TestThread2("https://i1.hdslb.com/bfs/face/020995d8827b560809e2fbbc44febc23af57f16a.jpg","1.jpg");
        TestThread2 t2 = new TestThread2("https://i0.hdslb.com/bfs/feed-admin/e5b4755551c8b687550c40884e135fb8490c5f4e.jpg","2.jpg");
        TestThread2 t3 = new TestThread2("https://i0.hdslb.com/bfs/sycp/creative_img/202104/302897bde429a86ca8bbd50029fb1eed.jpg","3.jpg");

        new Thread(t1).start();
        new Thread(t2).start();
        new Thread(t3).start();


    }


}

//下载器
class WebDownloader{

    //下载方法
    public void downloader(String url,String name){
        try {
            FileUtils.copyURLToFile(new URL(url),new File(name));
        } catch (IOException e) {
            e.printStackTrace();
            System.out.println("IO异常,downloader方法出现问题");
        }
    }
}

tt3

package com.kaung.demo01;


//创建线程方式2: 实现runnable接口,重写run方法,执行线程需要丢入runnable接口实现类,调用start方法.
public class TestThread3 implements Runnable{
    @Override
    public void run() {

        for (int i = 0; i < 20; i++) {
            System.out.println("我在看代码------------"+i);
        }
    }

    public static void main(String[] args) {
        //创建runnable接口的实现类对象
        TestThread3 testThread3 = new TestThread3();
        //创建线程对象,通过线程对象来开启我们的线程,代理
        //Thread thread = new Thread(testThread3);
        //thread.start();

        new Thread(testThread3).start();

        for (int i = 0; i < 20; i++) {
            System.out.println("我在学习多线程"+i);
        }
    }
}

tt4

package com.kaung.demo01;

//多个线程同时操作同一个对象
//买火车票的例子

//发现问题: 多个线程操作同一个资源的情况下,线程不安全,数据紊乱.
public class TestThread4 implements Runnable{

    //票数
    private int ticketNums = 10;

    @Override
    public void run() {
        while (true){
            if (ticketNums<=0){
                break;
            }
            //模拟延时
            try {
                Thread.sleep(200);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            System.out.println(Thread.currentThread().getName()+"拿到了第"+ticketNums--+"票");
        }
    }

    public static void main(String[] args) {
        TestThread4 ticket = new TestThread4();

        new Thread(ticket,"小明").start();
        new Thread(ticket,"老师").start();
        new Thread(ticket,"黄牛党").start();
    }
}

demo02

tc

package com.kaung.demo02;

import com.kaung.demo01.TestThread2;
import org.apache.commons.io.FileUtils;

import java.io.File;
import java.io.IOException;
import java.net.URL;
import java.util.concurrent.*;

//线程创建方式三: 实现callable接口
/*
callable优点:
1.可以定义返回值
2.可以抛出异常
 */
public class TestCallable implements Callable<Boolean> {

    private String url;//网络图片地址
    private String name;//保存的文件名

    public TestCallable(String url,String name){
        this.url = url;
        this.name = name;
    }

    //下载图片线程的执行体
    @Override
    public Boolean call() {
        WebDownloader webDownloader = new WebDownloader();
        webDownloader.downloader(url,name);
        System.out.println("下载了文件名为"+name);
        return true;
    }

    public static void main(String[] args) throws ExecutionException, InterruptedException {
        TestCallable t1 = new TestCallable("https://i1.hdslb.com/bfs/face/020995d8827b560809e2fbbc44febc23af57f16a.jpg","1.jpg");
        TestCallable t2 = new TestCallable("https://i0.hdslb.com/bfs/feed-admin/e5b4755551c8b687550c40884e135fb8490c5f4e.jpg","2.jpg");
        TestCallable t3 = new TestCallable("https://i0.hdslb.com/bfs/sycp/creative_img/202104/302897bde429a86ca8bbd50029fb1eed.jpg","3.jpg");

        //创建执行服务
        ExecutorService ser = Executors.newFixedThreadPool(3);
        //提交执行
        Future<Boolean> r1 = ser.submit(t1);
        Future<Boolean> r2 = ser.submit(t2);
        Future<Boolean> r3 = ser.submit(t3);
        //获取结果
        boolean rs1 = r1.get();
        boolean rs2 = r2.get();
        boolean rs3 = r3.get();

        System.out.println(rs1);
        System.out.println(rs2);
        System.out.println(rs3);

        //关闭服务
        ser.shutdownNow();

    }


}

//下载器
class WebDownloader{

    //下载方法
    public void downloader(String url,String name){
        try {
            FileUtils.copyURLToFile(new URL(url),new File(name));
        } catch (IOException e) {
            e.printStackTrace();
            System.out.println("IO异常,downloader方法出现问题");
        }
    }
}

gaoji

1

package com.kaung.gaoji;

import java.util.concurrent.locks.ReentrantLock;

//测试Lock锁
public class TestLock {
    public static void main(String[] args) {


        TestLock2 testLock2 = new TestLock2();

        new Thread(testLock2).start();
        new Thread(testLock2).start();
        new Thread(testLock2).start();
    }
}

class TestLock2 implements Runnable{

    int ticketNums = 10;

    //定义一个lock锁
    private final ReentrantLock lock = new ReentrantLock();

    @Override
    public void run() {
        while (true){
            try {
                lock.lock();//加锁
                if (ticketNums>0){
                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    System.out.println(ticketNums--);
                }else{
                    break;
                }

            } finally {
                //解锁
                lock.unlock();
            }
        }
    }
}

2

package com.kaung.gaoji;

///测试生产者消费者模型-->利用缓冲区解决:管程法

//生产者,消费者,产品,缓冲区
public class TestPC {
    public static void main(String[] args) {
        SynContainer container = new SynContainer();

        new Productor(container).start();
        new Consumer(container).start();
    }
}

//生产者
class Productor extends Thread{
    SynContainer container;

    public Productor(SynContainer container) {
        this.container = container;
    }

    //生产


    @Override
    public void run() {
        for (int i = 0; i < 100; i++) {
            System.out.println("生产了"+i+"只鸡");
            try {
                container.push(new Chicken(i));
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}

//消费者
class Consumer extends Thread{
    SynContainer container;

    public Consumer(SynContainer container) {
        this.container = container;
    }

    //消费


    @Override
    public void run() {
        for (int i = 0; i < 100; i++) {
            try {
                System.out.println("消费了---->"+container.pop().id+"只鸡");
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}

//产品
class Chicken{
    int id;//产品编号

    public Chicken(int id) {
        this.id = id;
    }
}

//缓冲区
class SynContainer{

    //需要一个容器大小
    Chicken[] chickens = new Chicken[10];
    //容器计数器
    int count = 0;

    //生产者放入产品
    public synchronized void push(Chicken chicken) throws InterruptedException {
        //如果容器满了就需要等待消费者消费
        if (count== chickens.length){
            //通知消费者消费,生产者等待
            this.wait();
        }

        //如果没有满,我们就需要丢入产品
        chickens[count] = chicken;
        count++;

        //可以通知消费者消费了.
        this.notifyAll();
    }

    //消费者消费产品
    public synchronized Chicken pop() throws InterruptedException {
        //判断能否消费
        if(count==0){
            //等待生产者生产,消费者等待
            this.wait();
        }

        //如果可以消费
        count--;
        Chicken chicken = chickens[count];

        //吃完了,通知生产者生产
        this.notifyAll();

        return chicken;
    }


}

3

package com.kaung.gaoji;

//测试生产者消费者问题2:信号灯法,标志位解决
public class TestPc2 {

    public static void main(String[] args) {
        TV tv = new TV();
        new Player(tv).start();
        new Watcher(tv).start();
    }

}

//生产者-->演员
class Player extends Thread{
    TV tv;
    public Player(TV tv){
        this.tv = tv;
    }

    @Override
    public void run() {
        for (int i = 0; i < 20; i++) {
            if (i%2==0){
                this.tv.play("快乐大本营播放中");
            }else{
                this.tv.play("抖音,记录美好生活");
            }
        }
    }
}

//消费者-->观众
class Watcher extends Thread{
    TV tv;
    public Watcher(TV tv){
        this.tv = tv;
    }

    @Override
    public void run() {
        for (int i = 0; i < 20; i++) {
            tv.watch();
        }
    }
}

//产品-->节目
class TV{
    //演员表演,观众等待 T
    //观众观看,演员等待 F
    String voice;//表演的节目
    boolean flag = true;

    //表演
    public  synchronized void play(String voice){

        if (flag==false){
            try {
                this.wait();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }

        System.out.println("演员表演了:"+voice);
        //通知观众观看
        this.notifyAll();//通知唤醒
        this.voice = voice;
        this.flag = !this.flag;
    }

    //观看
    public synchronized void watch(){
        if (flag){
            try {
                this.wait();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        System.out.println("===========观看了:"+voice);
        //通知演员表演
        this.notifyAll();
        this.flag = !this.flag;
    }


}

4

package com.kaung.gaoji;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

//测试线程池
public class TestPool {

    public static void main(String[] args) {
        //1.创建服务,创建线程池
        //newFixedThreadPool 参数为: 线城市池大小
        ExecutorService service = Executors.newFixedThreadPool(10);

        service.execute(new MyThread());
        service.execute(new MyThread());
        service.execute(new MyThread());
        service.execute(new MyThread());

        //2.关闭连接
        service.shutdown();
    }
}

class MyThread implements Runnable{
    @Override
    public void run() {
        System.out.println(Thread.currentThread().getName());
    }
}

5

package com.kaung.gaoji;

import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.FutureTask;

//回顾总结线程的创建
public class ThreadNew {

    public static void main(String[] args) {

        new MyThread1().start();

        new Thread(new MyThread2()).start();

        FutureTask<Integer> futureTask = new FutureTask<Integer>(new MyThread3());
        new Thread(futureTask).start();

        try {
            Integer integer = futureTask.get();
            System.out.println(integer);
        } catch (InterruptedException e) {
            e.printStackTrace();
        } catch (ExecutionException e) {
            e.printStackTrace();
        }

    }

}

//1.继承Thread类
class MyThread1 extends Thread{
    @Override
    public void run() {
        System.out.println("MyThread1");
    }
}

//2.实现Runnable接口
class MyThread2 implements Runnable{
    @Override
    public void run() {
        System.out.println("MyThread2");
    }
}

//3.实现Callable接口
class MyThread3 implements Callable<Integer>{
    @Override
    public Integer call() throws Exception {
        System.out.println("MyThread3");
        return 100;
    }
}

lambda

tl1

package com.kaung.lambda;

/*
推导lambda表达式
 */
public class TestLambda1 {

    //3.静态内部类
    static class Like2 implements ILike{
        @Override
        public void lambda() {
            System.out.println("i like lambda2");
        }
    }

    public static void main(String[] args) {
        ILike like = new Like();
        like.lambda();

        like = new Like2();
        like.lambda();

        //4.局部内部类
        class Like3 implements ILike{
            @Override
            public void lambda() {
                System.out.println("i like lambda3");
            }
        }
        like = new Like3();
        like.lambda();

        //5.匿名内部类,没有类的名称,必须借助接口或父类
        like = new ILike() {
            @Override
            public void lambda() {
                System.out.println("i like lambda4");
            }
        };
        like.lambda();

        //6.用lambda简化
        like = () -> System.out.println("i like lambda5");

        like.lambda();

    }

}

//1.定义一个函数式接口
interface ILike{
    void lambda();
}

//2.实现类
class Like implements ILike{
    @Override
    public void lambda() {
        System.out.println("i like lambda");
    }
}

tl2

package com.kaung.lambda;

public class TestLambda2 {

    public static void main(String[] args) {

        //1.lambda表达式简化
        ILove love = (int a) -> {
                System.out.println("i love you-->"+a);
        };

        //简化1.参数类型
        love = (a) -> {
            System.out.println("i love you-->"+a);
        };
        
        //简化2.简化括号
        love = a -> {
            System.out.println("i love you-->"+a);
        };

        //简化3.去掉花括号
        love = a -> System.out.println("i love you-->"+a);

        /*总结:
        lambda表达式只能有一行代码的情况下才能简化成为一行,如果有多行,那么就用代码块包裹.
        前提是接口为函数式接口
        多个参数也可以去掉参数类型,要去掉就都去掉,必须加上括号(a,b,c)
         */
        

        love.love(521);
    }
}

interface ILove{
    void love(int a);
}

proxystatic

package com.kaung.proxystatic;

/*静态代理模式总结:
真实对象和代理对象都要实现同一个接口
代理对象要代理真实角色
好处:
代理对象可以做很多真实对象做不了的事情
真实对象可以专注做自己的事情
 */

public class StaticProxy {
    public static void main(String[] args) {
        You you = new You();//你要结婚

        new Thread().start();

        WeddingCompanyn weddingCompanyn = new WeddingCompanyn(new You());
        weddingCompanyn.HappyMarry();
    }
}

interface Marry{
    //人生四大喜事
    //久旱逢甘霖
    //他乡遇故知
    //洞房花烛夜
    //金榜题名时
    void HappyMarry();
}

//真实角色,你去结婚
class You implements Marry{
    @Override
    public void HappyMarry() {
        System.out.println("秦老师要结婚了,超开心");
    }
}

//代理角色,帮助你结婚
class WeddingCompanyn implements Marry{
    //代理谁>>真实目标角色
    private  Marry target;
    
    public WeddingCompanyn(Marry target) {
        this.target = target;
    }
    
    @Override
    public void HappyMarry() {
        before();
        this.target.HappyMarry();//这就是真实对象
        after();
    }

    private void after() {
        System.out.println("结婚之后,收尾款");
    }

    private void before() {
        System.out.println("结婚之前,布置现场");
    }
}

state

1

package com.kaung.state;

//测试守护线程
//上帝守护你
public class TestDaemon {

    public static void main(String[] args) {
        God god = new God();
        You you = new You();

        Thread thread = new Thread(god);
        thread.setDaemon(true);//默认值是false表示是用户线程,正常的线程都是用户线程

        thread.start();//上帝守护线程启动

        new Thread(you).start();//你,用户线程启动
    }
}


//上帝
class God implements Runnable{
    @Override
    public void run() {
        while(true){
            System.out.println("上帝保佑着你");
        }
    }
}

//你
class You implements Runnable{
    @Override
    public void run() {
        for (int i = 0; i < 36500; i++) {
            System.out.println("你一生都开心的活着!");
        }
        System.out.println("======goodbye! world!======");//Hello,World!
    }
}

2

package com.kaung.state;

//测试join方法,想象为插队
public class TestJoin implements Runnable{
    @Override
    public void run() {
        for (int i = 0; i < 1000; i++) {
            System.out.println("线程VIP来了"+i);
        }

    }

    public static void main(String[] args) throws InterruptedException {
        //启动我们的线程
        TestJoin testJoin = new TestJoin();
        Thread thread = new Thread(testJoin);
        thread.start();

        //主线程
        for (int i = 0; i < 500; i++) {
            if (i==200){
                thread.join();//插队
            }
            System.out.println("main"+i);
        }
    }
}

3

package com.kaung.state;

public class TestPriority extends Thread{

    public static void main(String[] args) {
        //主线程默认优先级
        System.out.println(Thread.currentThread().getName()+"-->"+Thread.currentThread().getPriority());

        MyPriority myPriority = new MyPriority();

        Thread t1 = new Thread(myPriority);
        Thread t2 = new Thread(myPriority);
        Thread t3 = new Thread(myPriority);
        Thread t4 = new Thread(myPriority);
        Thread t5 = new Thread(myPriority);
        Thread t6 = new Thread(myPriority);

        //先设置优先级,再启动
        t1.start();

        t2.setPriority(1);
        t2.start();

        t3.setPriority(4);
        t3.start();

        t4.setPriority(Thread.MAX_PRIORITY);//10
        t4.start();

        t5.setPriority(7);
        t5.start();

        t6.setPriority(8);
        t6.start();

    }


}


class MyPriority implements Runnable{
    @Override
    public void run() {
        System.out.println(Thread.currentThread().getName()+"-->"+Thread.currentThread().getPriority());
    }
}

4

package com.kaung.state;

import com.kaung.demo01.TestThread4;

//模拟网络延时
public class TestSleep implements Runnable{
    //票数
    private int ticketNums = 10;

    @Override
    public void run() {
        while (true){
            if (ticketNums<=0){
                break;
            }
            //模拟延时
            try {
                Thread.sleep(200);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            System.out.println(Thread.currentThread().getName()+"拿到了第"+ticketNums--+"票");
        }
    }

    public static void main(String[] args) {
        TestThread4 ticket = new TestThread4();

        new Thread(ticket,"小明").start();
        new Thread(ticket,"老师").start();
        new Thread(ticket,"黄牛党").start();
    }
}

5

package com.kaung.state;

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

//模拟倒计时
public class TestSleep2 {

    public static void main(String[] args) {
        //打印当前系统时间
        Date startTime = new Date(System.currentTimeMillis());//获取系统当前时间
        while (true){
            try {
                Thread.sleep(1000);
                System.out.println(new SimpleDateFormat("HH:mm:ss").format(startTime));
                startTime = new Date(System.currentTimeMillis());//更新系统当前时间

            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    //模拟倒计时
    public static void tenDown() throws InterruptedException {
        int num = 10;
        while (true){
            Thread.sleep(1000);
            System.out.println(num--);
            if (num<=0){
                break;
            }
        }
    }

}

6

package com.kaung.state;
//观察测试线程的状态
public class TestState {

    public static void main(String[] args) throws InterruptedException {
        Thread thread = new Thread(()-> {
            for (int i = 0; i < 5; i++) {
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
            System.out.println("/");
        });

        //观察状态
        Thread.State state = thread.getState();
        System.out.println(state);//NEW

        //观察启动后
        thread.start();//启动线程
        state = thread.getState();
        System.out.println(state);//Run

        while(state != Thread.State.TERMINATED){//只要线程不终止,就一直输出状态
            Thread.sleep(100);
            state = thread.getState();//更新线程状态
            System.out.println(state);//输出状态
        }

    }
}

7

package com.kaung.state;

//测试stop
//1.建议线程正常停止-->利用次数,不建议死循环.
//2.建议使用标志位-->设置一个标志位
//3.不要使用stop或者destroy等过时的或者JDK不建议使用的方法
public class TestStop implements Runnable{

    //设置一个标志位
    private boolean flag = true;

    @Override
    public void run() {
        int i = 0;
        while(flag){
            System.out.println("run......Thread"+i++);
        }

    }

    //设置一个公开的方法停止线程,转换标志位
    public void stop(){
        this.flag = false;
    }

    public static void main(String[] args) {
        TestStop testStop = new TestStop();
        new Thread(testStop).start();
        for (int i = 0; i < 1000; i++) {
            System.out.println("main"+i);
            if (i==900){
                //调用上面的stop方法来切换标志位,让线程停止
                testStop.stop();
                System.out.println(" 线程该停止了");
            }
        }
    }

}

8

package com.kaung.state;

//测试礼让线程
//礼让不一定成功,看CPU心情
public class TestYield {
    public static void main(String[] args) {
        MyYield myYield = new MyYield();

        new Thread(myYield,"a").start();
        new Thread(myYield,"b").start();
    }

}

class MyYield implements Runnable{
    @Override
    public void run() {
        System.out.println(Thread.currentThread().getName()+"线程开始执行");
        Thread.yield();//礼让
        System.out.println(Thread.currentThread().getName()+"线程停止");
    }
}

syn

1

package com.kaung.syn;

import java.util.concurrent.CopyOnWriteArrayList;

//测试JUC安全类型的集合
public class TestJUC {
    public static void main(String[] args) {
        CopyOnWriteArrayList<String> list = new CopyOnWriteArrayList<String>();
        for (int i = 0; i < 10000; i++) {
            new Thread(() -> {
                list.add(Thread.currentThread().getName());
            }).start();
        }

        try {
            Thread.sleep(3000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        System.out.println(list.size());
    }
}

2

package com.kaung.syn;

//不安全的取钱
//两个人去银行取钱,账户
public class UnsafeBank {
    public static void main(String[] args) {
        //账户
        Account account = new Account(100,"结婚基金");

        Drawing you = new Drawing(account,50,"你");
        Drawing wife = new Drawing(account,100,"wife");

        you.start();
        wife.start();
    }
}

//账户
class Account{
    int money;//余额
    String name;//卡名

    public Account(int money,String name) {
        this.money = money;
        this.name = name;
    }
}

//银行:模拟取款
class Drawing extends Thread{
    Account account;//账户
    //取了多少钱
    int drawingMoney;
    //现在手里有多少钱
    int nowMoney;

    public Drawing(Account account,int drawingMoney,String name){
        super(name);
        this.account = account;
        this.drawingMoney = drawingMoney;
    }

    //取钱
    //synchronized默认锁的是this
    @Override
    public void run() {
        //锁的对象就变化的量,需要增删改的对象
        synchronized (account) {

            //判断有没有钱
            if (account.money - drawingMoney < 0) {
                System.out.println(Thread.currentThread().getName() + "发现余额不足");
                return;
            }
            //sleep可以放大问题的发生性
            try {
                Thread.sleep(100);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            //当前余额 = 余额 - 你取的钱
            account.money = account.money - drawingMoney;
            //当前你手里的钱
            nowMoney = nowMoney + drawingMoney;

            System.out.println(account.name + "余额为" + account.money);
            //Thread.currentThread().getName() = Thread.currentThread().getName()
            System.out.println(this.getName() + "手里的钱" + nowMoney);
        }
    }
}

3

package com.kaung.syn;

//不安全的买票
public class UnsafeBuyTicket {
    public static void main(String[] args) {
        BuyTicket station = new BuyTicket();

        new Thread(station,"苦逼的我").start();
        new Thread(station,"牛逼的你们").start();
        new Thread(station,"可恶的黄牛党").start();

    }

}


class BuyTicket implements Runnable{

    //票
    private int ticketNums = 10;
    boolean flag = true;//外部停止方式

    @Override
    public void run() {
        //买票
        while (flag){
            buy();
        }
    }

    //synchronized同步方法锁的是this
    private synchronized void buy(){
        //判断是否有票
        if (ticketNums <= 0) {
            flag = false;
            return;
        }
        //模拟延时
        try {
            Thread.sleep(100);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        //买票
        System.out.println(Thread.currentThread().getName()+"拿到"+ticketNums--);

    }

}

4

package com.kaung.syn;

import java.util.ArrayList;
import java.util.List;

//线程不安全集合
public class UnsafeList {
    public static void main(String[] args) {
        List<String> list = new ArrayList<String>();
        for (int i = 0; i < 10000; i++) {
            new Thread(() -> {
                synchronized (list) {
                    list.add(Thread.currentThread().getName());
                }
            }).start();
        }
        try {
            Thread.sleep(3000);
        } catch (Exception e) {
            e.printStackTrace();
        }
        System.out.println(list.size());
    }
}

thread

DeadLock

package com.kaung.thread;

//死锁: 多个线程互相抱着对方需要的资源,然后形成僵持.
public class DeadLock {

    public static void main(String[] args) {
        Makeup g1 = new Makeup(0,"灰姑娘");
        Makeup g2 = new Makeup(1,"白雪公主");

        g1.start();
        g2.start();
    }

}

//口红
class Lipstick{

}

//镜子
class Mirror{

}

class Makeup extends Thread{

    //需要的资源只有一份,用static来保证只有一份
    static  Lipstick lipstick = new Lipstick();
    static  Mirror mirror = new Mirror();

    int choice;//选择
    String girlName;//使用化妆品的人

    Makeup(int choice,String girlName) {
        this.choice = choice;
        this.girlName = girlName;
    }

    @Override
    public void run() {
        //化妆
        try {
            makeup();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
    //化妆,互相持有对方的锁,就是需要拿到对方的资源
    private void makeup() throws InterruptedException {
        if (choice == 0) {
            synchronized (lipstick) {//获得口红的锁
                System.out.println(this.girlName + "获得了口红的锁");
                Thread.sleep(1000);
            }
            synchronized (mirror) {//一秒钟以后想获得镜子
                System.out.println(this.girlName + "获得了镜子的锁");
            }
        } else {
            synchronized (mirror) {//获得了镜子的锁
                System.out.println(this.girlName + "获得了镜子的锁");
                Thread.sleep(2000);
             }
            synchronized (lipstick) {//一秒钟后想获得口红
                System.out.println(this.girlName + "获得了口红的锁");
            }

        }
    }
}

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