thread playground - tell me the output.

SP4.java

public class SP4 {

    public synchronized void func1() {
        System.out.println("func1");
        func2();
    }

    public synchronized void func2() {
        System.out.println("func2");
        func3();
    }

    public synchronized void func3() {
        System.out.println("func3");
    }

    public static void main(String[] args) {

        SP4 sp = new SP4();

        Thread t = new Thread(new Runnable() {
            @Override
            public void run() {
                sp.func1();
            }
        });

        t.start();
    }
}