TreeMap集合遍历学习

/**

• • A:案例演示
• TreeMap集合键是Student值是String的案例
  */

TreeMap tm = new TreeMap<>(new Comparator() {

            @Override
            public int compare(Student s1, Student s2) {
                int num = s1.getName().compareTo(s2.getName());     //按照姓名比较
                return num == 0 ? s1.getAge() - s2.getAge() : num;
            }
        });
        tm.put(new Student("张三", 23), "北京");
        tm.put(new Student("李四", 13), "上海");
        tm.put(new Student("赵六", 43), "深圳");
        tm.put(new Student("王五", 33), "广州");

        System.out.println(tm);