使用内部类来将线程隐藏在类中的几种方法

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class InnerThread1{    private int countDown=5;    private Inner inner;    private class Inner extends Thread{        Inner(String name) {            super(name);            start();        }        @Override        public void run() {            while(true){                try {                    System.out.println(this);                    if(--countDown==0)                        return;                    TimeUnit.MILLISECONDS.sleep(10);                } catch (InterruptedException e) {                    System.out.println("interrupted");                }            }        }        public String toString(){            return getName()+":"+countDown;        }    }    public InnerThread1(String name){        inner=new Inner(name);    }}class InnerThread2{    private int countDown=5;    private Thread t;    public InnerThread2(String name){        t=new Thread(name){            @Override            public void run() {                while(true){                    try {                        System.out.println(this);                        if(--countDown==0)                            return;                        TimeUnit.MILLISECONDS.sleep(10);                    } catch (InterruptedException e) {                        System.out.println("sleep() interrupted");                    }                }            }            public String toString(){                return getName()+":"+countDown;            }        };        t.start();    }}class InnerRunnable1{    private int countDown=5;    private Inner inner;    private class Inner implements Runnable{        Thread t;        Inner(String name){            t=new Thread(this,name);            t.start();        }        @Override        public void run() {                try {                    while(true) {                        System.out.println(this);                        if (--countDown == 0)                            return;                        TimeUnit.MILLISECONDS.sleep(10);                    }                } catch (InterruptedException e) {                    System.out.println("sleep() interrupted");                }        }        public String toString(){            return t.getName()+": "+countDown;        }    }    public InnerRunnable1(String name){        inner=new Inner(name);    }}class InnerRunnable2{    private int countDown=5;    private Thread t;    public InnerRunnable2(String name){        t=new Thread(new Runnable() {            @Override            public void run() {                while(true){                    System.out.println(this);                    if(--countDown==0)                        return;                    try {                        TimeUnit.MILLISECONDS.sleep(10);                    } catch (InterruptedException e) {                        System.out.println("sleep() interrupted");                    }                }            }            public String toString(){                return Thread.currentThread().getName()+": "+countDown;            }        },name);    }}class ThreadMethod{    private int countDown=5;    private Thread t;    private String name;    public ThreadMethod(String name){        this.name=name;    }    public void runTask(){        if(t==null){            t=new Thread(name){                @Override                public void run() {                    while(true){                        System.out.println(this);                        if(--countDown==0)                            return;                        try {                            TimeUnit.MILLISECONDS.sleep(10);                        } catch (InterruptedException e) {                            System.out.println("sleep() interrupted");                        }                    }                }                public String toString(){                    return getName()+": "+countDown;                }            };            t.start();        }    }}public class ThreadVariations {    public static void main(String[] args){        new InnerThread1("InnerThread1");        new InnerThread2("InnerThread2");        new InnerRunnable1("InnerRunnable1");        new InnerRunnable2("InnerRunnable2");        new ThreadMethod("ThreadMethod").runTask();    }}
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