ahyeah
diff --git a/‎JavaTest/.idea/workspace.xml‎
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diff --git a/‎JavaTest/out/production/JavaTest/ChooseSort.class‎
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diff --git a/‎JavaTest/out/production/JavaTest/DumplicatArray.class‎
934 Bytes b/‎JavaTest/out/production/JavaTest/DumplicatArray.class‎
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diff --git a/‎JavaTest/out/production/JavaTest/Person.class‎
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diff --git a/‎JavaTest/out/production/JavaTest/TestArray.class‎
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diff --git a/‎JavaTest/src/DumplicatArray.java‎
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diff --git a/‎JavaTest/src/TestArray.java‎
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@@ -0,0 +1,35 @@
+public class DumplicatArray {
+
+
+public static void main(String args[]){
+    int[] number=new int[0];
+    int[] fa={0};
+    duplicate(number,number.length,fa);
+    System.out.println(fa[0]);
+}
+        // Parameters:
+        //    numbers:     an array of integers
+        //    length:      the length of array numbers
+        //    duplication: (Output) the duplicated number in the array number,length of duplication array is 1,so using duplication[0] = ? in implementation;
+        //                  Here duplication like pointor in C/C++, duplication[0] equal *duplication in C/C++
+        //    这里要特别注意~返回任意重复的一个，赋值duplication[0]
+        // Return value:       true if the input is valid, and there are some duplications in the array number
+        //                     otherwise false
+        public static boolean duplicate(int numbers[],int length,int [] duplication) {
+            if(numbers.length==0){
+                return false;
+            }
+            int[] num=new int[numbers.length];
+            for(int i=0;i<numbers.length;i++){
+                num[numbers[i]]++;
+            }
+            for(int j=0;j<num.length;j++){
+                if(num[j]>1){
+                    duplication[0]=j;
+                    return true;
+                }
+            }
+            return false;
+        }
+
+}
@@ -0,0 +1,48 @@
+public class TestArray {
+
+    public static void main(String[]args ){
+Person Lee=new Person("Lee",20);
+        Person Mary=new Person("Mary",18);
+Person[] Students=new Person[2];
+        Students[0]=Lee;
+        Students[1]=Mary;
+        Students[0].setName("piopi");
+Lee.getInfo();
+Mary.getInfo();
+        Students[0].getInfo();
+        Students[1].getInfo();
+
+
+
+    }
+
+
+
+}
+class  Person{
+    private String name;
+    private int age;
+
+    public Person(String name,int age){
+        this.age=age;
+        this.name=name;
+    }
+    public String getName() {
+        return name;
+    }
+
+    public int getAge() {
+        return age;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public void setAge(int age) {
+        this.age = age;
+    }
+    public void getInfo(){
+        System.out.println("age:"+this.getAge()+"  name:"+this.getName());
+    }
+}