groovy wait time

1class TestMultiThreadSleep implements Runnable {
2   String name;
3   public TestMultiThreadSleep(String name) {
4      this.name = name;
5   }
6   static void main(String[] args) {
7      Thread thread1 = new Thread(new TestMultiThreadSleep("A"));          
8      Thread thread2 = new Thread(new TestMultiThreadSleep("B"));
9      Thread thread3 = new Thread(new TestMultiThreadSleep("C"));
10      thread1.start();
11      thread2.start();
12      thread3.start();
13    }
14   @Override
15   public void run() {
16      println "${name} Step 1"
17      sleep(3000)
18      println "${name} Step 2"
19      sleep(3000)
20      println "${name} Step 3"      
21   }
22}