线程，join合并线程

public class Join01 extends Thread {
    @Override
    public void run() {
        int sum =0;
        for(int i=0;i<10000000;i++){
            sum+=1;
        }
        System.out.println(sum+"：@_@");
    }
    public static void main(String[] args) throws InterruptedException {
        Join01 t = new Join01();
        t.start();
        for(int i=0;i<100;i++){
            if(i==18){t.join();}
            System.out.println(i+":main");
        }
    }
}