自定义实现Map类

 1 package text;
 2 
 3 public class SxtMap001{
 4     SxtEntry[] arr = new SxtEntry[990];
 5     int size;
 6     public void put(Object key,Object value){
 7         SxtEntry e = new SxtEntry(key,value);
 8         arr[size++]=e;//放入数组中
 9     }
10     
11     public Object get(Object key){
12         for(int i=0;i<size;i++){
13             if(arr[i].key.equals(key)){
14                 return arr[i].value;
15             }
16         }
17         return null;
18     }
19     public boolean containsKey(Object key){
20         for(int i=0;i<size;i++){
21             if(arr[i].key.equals(key)){
22                 return true;
23             }
24         }
25         return false;
26     }
27     
28     public boolean containsvalue(Object value){
29         for(int i=0;i<size;i++){
30             if(arr[i].value.equals(value)){
31                 return true;
32             }
33         }
34         return false;
35     }
36     public void  putAll(SxtMap001 T){
37         for(int i=0;i<T.size;i++){
38             System.out.println(arr[i].key+":"+((Wife)arr[i].value).name);
39         }
40     }
41     
42     
43     public static void main(String[] args){
44         SxtMap001 m = new SxtMap001();
45         m.put("张三",new Wife("杨幂"));//Wife请参考上一篇，其实就是一个用来创建对象的类
46         m.put("张三",new Wife("李四"));
47         Wife w=(Wife) m.get("张三");
48         System.out.println(w.name);
49         Object M="李四";
50         System.out.println(m.containsKey("张三"));
51         System.out.println(m.containsvalue("李四"));
52         m.putAll(m);
53         
54         
55     }
56 }
57 class SxtEntry{
58     Object key;
59     Object value;
60     
61     public SxtEntry(Object key,Object value){
62         super();
63         this.key=key;
64         this.value=value;
65     }
66 }

运行结果：
杨幂
true
false
张三:杨幂
张三:李四