Java 遍历Map的两种方式

Map<Integer,String> map = new HashMap<>();
map.put(3,"张三");
map.put(5,"王五");
map.put(9,"吴九");
map.put(1,"刘一");
map.put(10,"郑十");
map.put(4,"李四");
map.put(8,"周八");
map.put(6,"赵六");
map.put(2,"陈二");
map.put(7,"孙七");

Set<Integer> keySet = map.keySet();
for (Integer key : keySet){
    String value = map.get(key);
    System.out.println(key + ":" + value);
}

Set<Map.Entry<Integer, String>> entrySet = map.entrySet();
for (Map.Entry<Integer, String> entry : entrySet){
    Integer key = entry.getKey();
    String value = entry.getValue();
    System.out.println(key + ":" + value);
}