多线程15--线程本地变量ThreadLocal

1.

public class ConnThreadLocal {

    //线程变量副本,每个线程都有一个,所以多线程的时候,就不会出现覆盖.而是每个线程一个
    public static ThreadLocal<String> th = new ThreadLocal<String>();
    
    public void setTh(String value){
        th.set(value);
    }
    public void getTh(){
        System.out.println(Thread.currentThread().getName() + ":" + this.th.get());
    }
    
    public static void main(String[] args) throws InterruptedException {
        
        final ConnThreadLocal ct = new ConnThreadLocal();
        Thread t1 = new Thread(new Runnable() {
            @Override
            public void run() {
                ct.setTh("张三");
                ct.getTh(); //t1:张三
            }
        }, "t1");
        
        Thread t2 = new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    Thread.sleep(1000);
                    ct.setTh("李四");
                    ct.getTh();//t2:李四
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }, "t2");
        
        t1.start();
        t2.start();
    }
    
}