package com.test.Test11;

import java.util.*;

public class Test02 {
    public static void main(String[] args) {
        /*
         * 增加：put(K key,V value)
         * 删除：clear() remove(Object key)
         * 修改：
         * 查看：entrySet() get(Object key) keySet()  size() values()
         * 判断：containsKey(Object key) containsValue(Object value)
         * equals(Object o) isEmpty()
         * */
        //TreeMap 唯一，有序(按升序或者降序排序)
        TreeMap<String, Integer> map = new TreeMap<>();

        map.put("blili", 1234);
        map.put("alili", 2345);
        map.put("blili", 5467);
        map.put("clili", 5678);
        map.put("dlili", 2345);
        System.out.println(map.size()); //4(上面的添加了5对数据，只出来4对数据)
        System.out.println(map); //{alili=2345, blili=5467, clili=5678, dlili=2345}
    }
}