关于java:FutureTask实现多个线程顺序运行

[问题]

有线程T1,T2,T3,T4 如何实现线程依照T1-T4程序运行?

[代码]

public static void main(String[] args) {
    final FutureTask<Integer> ft1 = new FutureTask<>(()-> {
        System.out.println("ft1");
        return 1;
    });
    final FutureTask<Integer> ft2 = new FutureTask(()-> {
        ft1.get();
        System.out.println("ft2");
        return 1;
    });
    final FutureTask<Integer> ft3 = new FutureTask(()-> {
        ft2.get();
        System.out.println("ft3");
        return 1;
    });
    final FutureTask<Integer> ft4 = new FutureTask(()-> {
        ft3.get();
        System.out.println("ft4");
        return 1;
    });
    new Thread(ft1).start();
    new Thread(ft2).start();
    new Thread(ft3).start();
    new Thread(ft4).start();
}