对map里面的key排序

Question

对map里面的key排序 求代码示例

Answer 1

public class text {

    private   HashMap   map           =   new   HashMap(); 
    private   Set           keySet     =   map.keySet(); 

    public   Object   get(String   key)   { 
            return   map.get(key); 
    } 

    public   void   put(String   key,   Object   value)   { 
            map.put(key,   value); 
    } 

    public   void   sort()   { 
            List   list   =   new   ArrayList(map.keySet()); 

            Collections.sort(list,   new   Comparator()   { 
                    public   int   compare(Object   a,   Object   b)   { 
                            return   a.toString().toLowerCase().compareTo(b.toString() 
                                    .toLowerCase()); 
                    } 
            }); 

            this.keySet   =   new   TreeSet(list); 
    } 

    public   Set   keySet()   { 
            return   this.keySet; 
    } 

 public   static   void   main(String [] args){ 
     text   map   =   new   text(); 
     map.put("1", "yi");
    map.put("8", "ba");
    map.put("9", "jiu");
    map.put("7", "qi");
    map.put("5", "wu");
    map.put("6", "liu");
    map.put("4", "si");
    map.put("3", "san");
    map.put("2", "er");

            for   (Iterator   it   =   map.keySet().iterator();   it.hasNext();)   { 
                    String   key   =   (String)   it.next(); 
                    //System.out.println( "key[ "   +   key   +   "],   value[ "   +   map.get(key)   +   "] "); 
            } 

           // System.out.println( "\n "); 
            map.sort(); 
            for   (Iterator   it   =   map.keySet().iterator();   it.hasNext();)   { 
                    String   key   =   (String)   it.next(); 
                    System.out.println( "key[ "   +   key   +   "],   value[ "   +   map.get(key)   +   "] "); 
            } 
    } 

iihero 他的代码写的很好 但是我这个比较容易懂