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public class Letters extends Thread{
private String name;
public Letters(String name) {
this.name=name;
}
public void write(){
System.out.print(name);
System.out.print(name);
}
public void run(){
synchronized (System.out){//或者用 synchronized (Letters.class){ x
write();
}
}
public static void main(String[] args) {
new Letters("X").start();
new Letters("Y").start();
}
}