java死锁程序

package pack;

class Test implements Runnable {
Object locka = new Object();
Object lockb = new Object();
private boolean flag;
Test(boolean flag) {
this.flag = flag;
}

public void run() {
if(flag) {
synchronized(locka) {
System.out.println("if locka");
synchronized(lockb) {
System.out.println("if lockb");
}
}
}
else {
synchronized(lockb) {
System.out.println("else lockb");
synchronized(locka) {
System.out.println("else locka");
}
}
}
}
}

public class Main {

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