Java1-岳强1514011414

[MurphysL]

1.删除后三只羊
    int num = sheepList.size(); 

        System.out.println("从后向前删:");

        for(int i = num - 1;i >= num - 3;i --){
            sheepList.remove(i);        
        }
        for(Object s:sheepList){
            System.out.println(((Sheep)s).name);
        }

        System.out.println("从前向后删");
        for(int i = 0;i < num - 3;i ++){
                sheepList.remove(0);
        }for(Object s:sheepList){
            System.out.println(((Sheep)s).name);
        }

        System.out.println("foreach:");
        int i = 0;
        for(Object s:sheepList){            
            if(i >= 3){
                sheepList.remove(((Sheep)s).name);
            }else{
                System.out.println(((Sheep)s).name);        
            }
            i ++;
        }

        Iterator it = sheepList.iterator();
        System.out.println("通过迭代器遍历:");
        for(int i = num - 1;i > num - 3;i --){
            if(i <= 3){
                sheepList.remove(i);
            }
            while(it.hasNext()){
                Sheep csn = (Sheep)it.next();
                System.out.println(csn.name);
            }
        }

    2.自动写文件   
        public static void main(String[] args) throws IOException{
        //创建目标文件
        File Demo = new File("e://YQ");
        if(!Demo.exists()){
            Demo.mkdir();
        }
        for(int i = 0;i < 10;i ++){
            File file = new File("e://YQ//yq" + i + ".txt");
            if(!file.exists()){
                file.createNewFile();           
            }
        }

        String[] filenames = Demo.list();
        for(int i = 0;i < filenames.length;i ++){
            FileOutputStream fos = new FileOutputStream("e://YQ//yq" + i + ".txt");
            String s = "我真" + i;
            fos.write(s.getBytes());
            fos.close();
            System.out.println("第" + i + "次写入完成");
        }   

    }

3.线程实现方法继承Thread与接口Runnnale的区别      
    public static void main(String[] args) {
        //数据独立,其数值分别为3,2,1
        Threadexend person1 = new Threadexend("关公");
        Threadexend person2 = new Threadexend("秦琼");
        person1.start();
        person2.start();

        //对象唯一，数据共享，数值一共是3,2,1
        IThread person3 = new IThread();
        new Thread(person3,"奥特曼").start();
        new Thread(person3,"小怪兽").start();
    }

    static class Threadexend extends Thread{
        public Threadexend(String name){
            super(name);
        }
        public Threadexend(){
            super();
        }
        private int nuqi = 3;
        public void run(){
            for(int i = 1;i <= 3;i ++){
                if(nuqi > 0){
                    System.out.println(getName() +"第" + i + "次打了对方" + "," + "剩余怒气值" + nuqi--);
                }
            }       
        }