package com.suiwei;import java.text.ParseException;import java.util.HashMap;import java.util.Set;public class B { public static void main(String[] args) throws ParseException { HashMap<String, HashMap<String, Integer>> map = new HashMap<String, HashMap<String,Integer>>(); HashMap<String, Integer> map1 = new HashMap<String, Integer>(); map1.put("一班張三", 20); map1.put("一班李四", 22); map.put("一班", map1); HashMap<String, Integer> map2 = new HashMap<String, Integer>(); map1.put("二班張三", 200); map1.put("二班李四", 222); map.put("二班", map2); Set<String> set = map.keySet(); for (String string : set) { System.out.println(string); HashMap<String, Integer> mapneibu = map.get(string); Set<String> set2 = mapneibu.keySet(); for (String string2 : set2) { System.out.println(string2+"--"+mapneibu.get(string2)); } } }}輸出結(jié)果為：二班一班二班李四--222一班張三--20一班李四--22二班張三--200
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