看到群里有人發出兩個面試問題，寫了下第7題的線程題目，得出了答案，把代碼貼出來，以后自己常來看看，寫寫東西。話說這是我寫的第一篇博客，有點O(∩_∩)O！

以下是第7題的答案

    PRivate ActivityMyAppleForBinding binding;    List<HashMap<String,String>>  list=new ArrayList<>();    List<String> listkey=new ArrayList<>();    Thread t1,t2;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);//        binding=DataBindingUtil.setContentView(this,R.layout.activity_my_apple_for);//        recyclerview_item_apply_job        HashMap<String,String> map1=new HashMap<>();        map1.put("macBookPro","8988");        list.add(map1);        HashMap<String,String> map2=new HashMap<>();        map2.put("三星note7","5675");        list.add(map2);        HashMap<String,String> map3=new HashMap<>();        map3.put("小米4","2688");        list.add(map3);        HashMap<String,String> map4=new HashMap<>();        map4.put("聯想p612","866");        list.add(map4);        HashMap<String,String> map5=new HashMap<>();        map5.put("iphone7","5688");        list.add(map5);        listkey.add("macBookPro");        listkey.add("三星note7");        listkey.add("小米4");        listkey.add("聯想p612");        listkey.add("iphone7");        TestTask testTask=new TestTask();        t1=new Thread(testTask);        t2=new Thread(testTask);        t1.start();        t2.start();    }    public class TestTask implements Runnable{      //執行線程        @Override        public void run() {            //抽取次數不做限制，直到獎品抽完為止            while (listkey.size()>0){                int size=listkey.size();                //隨機抽取出的獎品                int number = new Random().nextInt(size);                String key=listkey.get(number);//                String value=list.get(number).get(key);                listkey.remove(number);//                list.remove(number);                Log("+++++++"+Thread.currentThread().getName()+"------key--"+key);                Log("----t1-----"+t1.getName());                Log("----t2-----"+t2.getName());//                02-07 10:49:57.978 27727-29735/org.unionapp.xfjyw E/LOG: +++++++Thread-4083------key--iphone7//                02-07 10:49:57.979 27727-29735/org.unionapp.xfjyw E/LOG: ----t1-----Thread-4083//                02-07 10:49:57.979 27727-29735/org.unionapp.xfjyw E/LOG: ----t2-----Thread-4084//                02-07 10:49:57.979 27727-29735/org.unionapp.xfjyw E/LOG: +++++++Thread-4083------key--三星note7//                02-07 10:49:57.979 27727-29735/org.unionapp.xfjyw E/LOG: ----t1-----Thread-4083//                02-07 10:49:57.979 27727-29736/org.unionapp.xfjyw E/LOG: +++++++Thread-4084------key--macBookPro//                02-07 10:49:57.979 27727-29736/org.unionapp.xfjyw E/LOG: ----t1-----Thread-4083//                02-07 10:49:57.979 27727-29736/org.unionapp.xfjyw E/LOG: ----t2-----Thread-4084//                02-07 10:49:57.979 27727-29736/org.unionapp.xfjyw E/LOG: +++++++Thread-4084------key--聯想p612//                02-07 10:49:57.979 27727-29736/org.unionapp.xfjyw E/LOG: ----t1-----Thread-4083//                02-07 10:49:57.979 27727-29736/org.unionapp.xfjyw E/LOG: ----t2-----Thread-4084//                02-07 10:49:57.980 27727-29735/org.unionapp.xfjyw E/LOG: ----t2-----Thread-4084//                02-07 10:49:57.981 27727-29736/org.unionapp.xfjyw E/LOG: +++++++Thread-4084------key--小米4//                02-07 10:49:57.981 27727-29736/org.unionapp.xfjyw E/LOG: ----t1-----Thread-4083//                02-07 10:49:57.981 27727-29736/org.unionapp.xfjyw E/LOG: ----t2-----Thread-4084            }        }    }
有點亂，可以多試幾種方法去解答，再去多學習下線程的東西，來做總結。