2020.02.26 TreeMap集合

package com.guoyun.bean;

import java.sql.Time;

/** * ClassName: * Function:  ADD FUNCTION * Reason:   ADD REASON * * @author * @Date * @since Ver 1.1 */public class TimeBean implements Comparable<TimeBean>{    //年    public int year;    //描述信息    public String desc;

    @Override    public int compareTo(TimeBean o) {        //升序        return year-o.year;    }}*********************************************************************

package com.guoyun.view;

import com.guoyun.bean.TimeBean;

import java.io.Serializable;import java.util.*;

/** * ClassName: * Function:  ADD FUNCTION * Reason:   ADD REASON * * @author * @Date * @since Ver 1.1 */public class MainView {    public static void main(String[] args) {        TreeMap<Integer,String> map1=new TreeMap<>();        AbstractMap<Integer,String> map2=new TreeMap<>();        Map<Integer,String> map3=new TreeMap<>();        NavigableMap<Integer,String> map4=new TreeMap<>();        SortedMap<Integer,String> map5=new TreeMap<>();        Cloneable map6=new TreeMap<>();        Serializable map7=new TreeMap<>();        map3.put(1,"一个不知名上单");        map3.put(2,"一个不知名打野");        map3.put(3,"一个不知名中单");        map3.put(4,"一个不知名AD");        map3.put(5,"一个不知名辅助");//        System.out.println(map3.get(5));        Set<Integer> set=map3.keySet();        //String和包装类实现自动排序        for (Integer i:set             ) {//            System.out.println(i+"\t"+map3.get(i));        }        Map<TimeBean,String> map8=new TreeMap<>(new MyComparator());        TimeBean t1=new TimeBean();        t1.year=1999;        t1.desc="Birthday";        TimeBean t2=new TimeBean();        t2.year=2000;        t2.desc="After";        TimeBean t3=new TimeBean();        t3.year=1998;        t3.desc="Your";        map8.put(t1,"aojiedechushengriqi");        map8.put(t2,"aojietayisuile");        map8.put(t3,"mourendeshengri");        Set<Map.Entry<TimeBean,String>> set1=map8.entrySet();        for (Iterator<Map.Entry<TimeBean, String>> iterator = set1.iterator(); iterator.hasNext(); ) {            Map.Entry<TimeBean, String> next =  iterator.next();            System.out.println(next.getKey().year+"\t"+next.getValue());        }

    }}****************************************************

package com.guoyun.view;

import com.guoyun.bean.TimeBean;

import java.util.Comparator;

/** * ClassName: * Function:  ADD FUNCTION * Reason:   ADD REASON * * @author * @Date * @since Ver 1.1 */public class MyComparator implements Comparator<TimeBean> {    @Override    public int compare(TimeBean o1, TimeBean o2) {        return o1.year-o2.year;    }}

原文地址：https://www.cnblogs.com/aojie/p/12369342.html