通过Map的entrySet方法。将返回一个set集合。然后遍历这个set集合:
package com.howlaa.day04; import java.util.HashMap; import java.util.Map; import java.util.Set; public class GenericTest { public static void main(String[] args) { HashMap<String,Integer> maps = new HashMap<String,Integer>(); maps.put("zhang", 20); maps.put("hui", 22); Set<Map.Entry<String,Integer>> entrySet = maps.entrySet(); for (Map.Entry<String, Integer> entry : entrySet) { System.out.println(entry.getKey()+":"+entry.getValue()); } } }