为啥不是顺序执行的？

Question

package test;

public class test {

public void f1() {
    new Thread() {
        public void run() {
            try {
                Thread.sleep(500);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            System.out.println("f1");
        }
    }.start();
}

public void f2() {
    new Thread() {
        public void run() {
            try {
                Thread.sleep(500);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            System.out.println("f2");
        }
    }.start();
}


public void f3() {
    new Thread() {
        public void run() {
            try {
                Thread.sleep(500);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            System.out.println("f3");
        }
    }.start();
}

synchronized void m1() {
    f1();
}
synchronized void m2() {
    f2();
}
synchronized void m3() {
    f3();
}
public static void main(String[] args) {
    test test = new test();
    test.m1();
    test.m2();
    test.m3();
}

}

Answer 1

多线程的执行和线程写的前后顺序无关，和CPU中的线程调度有关