/* * To change this template, choose Tools | Templates * and open the template in the editor. */package cn.tsp2c.liubao;import java.util.Collection;import java.util.HashMap;import java.util.Iterator;import java.util.Map;import java.util.Set;import java.util.TreeMap;public class TestMap {    public static void main(String[] args) {        Map
     
       map = new HashMap
      
       ();        Student s1 = new Student("宋江", "1001", 38);        Student s2 = new Student("卢俊义", "1002", 35);        Student s3 = new Student("吴用", "1003", 34);        map.put("1001", s1);        map.put("1002", s2);        map.put("1003", s3);        Map
       
         subMap = new HashMap
        
         ();        subMap.put("1008", new Student("tom", "1008", 12));        subMap.put("1009", new Student("jerry", "1009", 10));        map.putAll(subMap);        work(map);        workByKeySet(map);        workByEntry(map);    }//最常规的一种遍历方法，最常规就是最常用的，虽然不复杂，但很重要，这是我们最熟悉的，就不多说了！！    public static void work(Map
         
           map) {        Collection
          
            c = map.values(); Iterator it = c.iterator(); for (; it.hasNext();) { System.out.println(it.next()); } }//利用keyset进行遍历，它的优点在于可以根据你所想要的key值得到你想要的 values，更具灵活性！！ public static void workByKeySet(Map
           
             map) { Set
            
              key = map.keySet(); for (Iterator it = key.iterator(); it.hasNext();) { String s = (String) it.next(); System.out.println(map.get(s)); } }//比较复杂的一种遍历在这里，呵呵~~他很暴力哦，它的灵活性太强了，想得到什么就能得到什么~~ public static void workByEntry(Map
             
               map) { Set
              
               
                > set = map.entrySet(); for (Iterator
                
                 
                  > it = set.iterator(); it.hasNext();) { Map.Entry
                  
                    entry = (Map.Entry
                   
                    ) it.next(); System.out.println(entry.getKey() + "--->" + entry.getValue()); } }}class Student { private String name; private String id; private int age; public Student(String name, String id, int age) { this.name = name; this.id = id; this.age = age; } @Override public String toString() { return "Student{" + "name=" + name + "id=" + id + "age=" + age + '}'; }}