HashMap与ArrayList的相互嵌套

HashMap嵌套ArrayList的代码实现

HashMap<String, ArrayList<String>> hm = new HashMap<String, ArrayList<String>> ();

HashMap<String, ArrayList<String>> hm = new HashMap<String, ArrayList<String>> ();
ArrayList<String> array1 = new ArrayList<String>();
array1.add("吕布");
array1.add("周瑜");
hm.put("三国演义", array1);
ArrayList<String> array2 = new ArrayList<String>();
array2.add("令狐冲");
array2.add("林平之");
hm.put("笑傲江湖", array2);
ArrayList<String> array3 = new ArrayList<String>();
array3.add("郭靖");
array3.add("杨过");
hm.put("神雕侠侣", array3);
Set<String> set = hm.keySet();
for (String key :set) {
System.out.println(key);
ArrayList<String> value = hm.get(key);
for (String s : value) {
System.out.println(" "+s);

}
}

结果：

三国演义
            吕布
            周瑜
笑傲江湖
           令狐冲 
           林平之
神雕侠侣
          郭靖
          杨过

---

ArrayList嵌套HashMap

ArrayList<HashMap<String, String>> list = new ArrayList<HashMap<String,String>>();

ArrayList<HashMap<String, String>> list = new ArrayList<HashMap<String,String>>();
HashMap<String, String> map1 = new HashMap<String, String>();
HashMap<String, String> map2 = new HashMap<String, String>();
HashMap<String, String> map3 = new HashMap<String, String>();
map1.put("周瑜", "小乔");
map1.put("吕布", "貂蝉");
map2.put("郭靖", "黄蓉");
map2.put("杨过", "小龙女");
map3.put("令狐冲", "任盈盈");
map3.put("林平之", "岳灵珊");
list.add(map1);
list.add(map2);
list.add(map3);
for(int i=0;i<list.size();i++) {
HashMap<String, String> map = list.get(i);
Set<String> set = map.keySet();
for (String str : set) {
String value = map.get(str);
System.out.println(str+"-------"+value);
}
}

吕布-------貂蝉
周瑜-------小乔
杨过-------小龙女
郭靖-------黄蓉
令狐冲-------任盈盈
林平之-------岳灵珊