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代码：

Map<String,String> map = new HashMap<>();
map.put("张三","1212");
map.put("王五","jsd");
for(Map.Entry<String,String> set:map.entrySet()){
    System.out.println(set);//{张三=1212,王五=js}
    System.out.println(set.getKey()+set.getValue());
}

1. Set<Map.Entry<K,V>> entrySet() {

Set<Map.Entry<K,V>> es;
return (es = entrySet) == null ? (entrySet = new EntrySet()) : es;

} //返回该类型的set集合：{张三=1212,王五=js}