【TreeMap】

package com.yjf.esupplier.common.test;

import java.util.Set;
import java.util.TreeMap;

/**
 * @author shusheng
 * @description
 * @Email shusheng@yiji.com
 * @date 2018/12/18 13:46
 */
public class TreeMapDemo {
        //鍵是紅黑樹結構，能夠保證鍵的排序和惟一性
    public static void main(String[] args) {
        //建立集合對象
        TreeMap<String,String> tm = new TreeMap<String,String>();

        //添加元素
        tm.put("hello", "你好");
        tm.put("world", "世界");
        tm.put("java", "爪哇");
        tm.put("world", "世界2");
        tm.put("javaee", "你好ee");
        tm.put("aaa", "你好ee");

        //遍歷集合
        Set<String> set = tm.keySet();
        for(String key : set){
            String value = tm.get(key);
            System.out.println(key + "---" + value);
        }
    }

}