Javaマルチスレッドfor beginner

public class Multi {

	public static void main(String args[]) {
		Thread t1 = new MyThread("Steve");
		Thread t2 = new MyThread("Jesse");
		t1.start();
		t2.start();
	}

}

class MyThread extends Thread {

	private String name;
	
	public MyThread(String name) {
		this.name = name;
	}

	@Override
	public void run() {
		for (int i = 0; i < 10; i++) {
			System.out.println(name + " " + i);
			try {
				Thread.sleep(20);
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		}
	}

}

結果は毎回異なります.

Steve 0
Jesse 0
Steve 1
Jesse 1
Jesse 2
Steve 2
Jesse 3
Steve 3
Jesse 4
Jesse 5
Steve 4
Jesse 6
Steve 5
Jesse 7
Steve 6
Jesse 8
Steve 7
Jesse 9
Steve 8
Steve 9