public static class MyThread extends Thread{
private Vector<String> container = null;
public MyThread(Vector<String> container) {
this.container = container;
}
@Override
public void run() {
while (true) {
try {
if(container.size()<1){
Thread.sleep(500);
container.add("index: "+container.size());
}else{
break;
}
} catch (InterruptedException e) {
}
}
}
}
public static void main(String[] args) throws InterruptedException {
Vector<String> list = new Vector<String>();
new MyThread(list).start();
new MyThread(list).start();
Thread.sleep(2000);
System.out.println(list.size());
}
2