Wait for the threads to finish
public class Main { public static void main(String[] args) throws Exception { Thread thread1 = new Thread(new TestThread(1)); Thread thread2 = new Thread(new TestThread(2)); thread1.start(); thread2.start(); thread1.join(); thread2.join(); } } class TestThread implements Runnable { int id; public TestThread(int id) { this.id = id; } public void run() { for (int i = 1; i <= 10; i++) { System.out.println("Thread" + id + ": " + i); } } }