ThreadLocal详解

//普通调用
public class Main{
    static public void main(String[] args){
        Thread t=new Thread();
        t.start();
    }
}

//继承Thread类，重写run方法
//普通调用
public class Main{
    static public void main(String[] args){
        Thread t=new MyThread();
        t.start();
    }
}

public class MyThread extends Thread{
    @Override
    public void run(){
        System.out.println("start new thread!");
    }
}

//继承Runnable接口，重写run方法
public class Main {
    public static void main(String[] args) {
        Thread t = new Thread(new MyRunnable());
        t.start(); // 启动新线程
    }
}

class MyRunnable implements Runnable {
    @Override
    public void run() {
        System.out.println("start new thread!");
    }
}

import java.util.concurrent.*;

public class Main {
    public static void main(String[] args) {
        // 创建一个固定大小的线程池:
        ExecutorService es = Executors.newFixedThreadPool(4);
        for (int i = 0; i < 6; i++) {
            es.submit(new Task("" + i));
        }
        // 关闭线程池:
        es.shutdown();
    }
}

class Task implements Runnable {
    private final String name;

    public Task(String name) {
        this.name = name;
    }

    @Override
    public void run() {
        System.out.println("start task " + name);
        try {
            Thread.sleep(1000);
        } catch (InterruptedException e) {
        }
        System.out.println("end task " + name);
    }
}

public class MyThreadLocal{
    public class MyThreadLocal{
    static private ThreadLocal<Integer> localInt = new ThreadLocal<>();

    public int setAndGet(){
        localInt.set(8);
        return localInt.get();
    }
}
}