126_容器_自定义数据排序

来源：互联网发布：淘宝快递模板下载编辑：程序博客网时间：2024/05/18 01:04

这里写图片描述

NewsItem.jar

package collection.sort.newsitemsort;import java.text.SimpleDateFormat;import java.util.Date;/*** 新闻条目实体类*/public class NewsItem implements Comparable<NewsItem>{    //标题    private String title;    //点击量    private int hits;    //时间    private Date pubTime;    public NewsItem() {    }    public NewsItem(String title, int hits, Date pubTime) {        super();        this.title = title;        this.hits = hits;        this.pubTime = pubTime;    }    public String getTitle() {        return title;    }    public void setTitle(String title) {        this.title = title;    }    public int getHits() {        return hits;    }    public void setHits(int hits) {        this.hits = hits;    }    public Date getPubTime() {        return pubTime;    }    public void setPubTime(Date pubTime) {        this.pubTime = pubTime;    }    //时间降序 +点击量升序+标题降序    @Override    public int compareTo(NewsItem o) {        int result =0;        //比较 时间        result =-this.pubTime.compareTo(o.pubTime); //降序        if(0==result){ //时间相同            //点击量             result =this.hits-o.hits; //升序            if(0==result){ //点击量相同                 //标题                result=-this.title.compareTo(o.title);//降序            }        }               return result;    }    @Override    public String toString() {        StringBuilder sb =new StringBuilder();        sb.append("标题:").append(this.title);        sb.append(",时间:").append(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(this.pubTime));        sb.append(",点击量:").append(this.hits).append("\n");        return sb.toString();    }}

NewsItemImpl.jar

package collection.sort.newsitemsort;import java.util.ArrayList;import java.util.Collections;import java.util.Date;import java.util.List;/** * 使用Collections */public class NewsItemImpl {    public static void main(String[] args) {        List<NewsItem> news=new ArrayList<NewsItem>();        news.add(new NewsItem("美国后怕了，逃跑了悲剧了",50,new Date(System.currentTimeMillis()-1000*60*60)));        news.add(new NewsItem("中国登上钓鱼岛了，全国欢呼了",100,new Date()));        news.add(new NewsItem("小日本终于听话了，泪流满面笑了",60,new Date(System.currentTimeMillis()-1000*60*60)));        System.out.println("排序前:"+news);                //排序        Collections.sort(news);        System.out.println("排序后"+news);    }}

Goods.jar

package collection.sort.newsitemsort;public class Goods {    //商品名称    private String name;    //价格    private double price;    //收藏量    private int fav;    public Goods() {    }    public Goods(String name, double price, int fav) {        super();        this.name = name;        this.price = price;        this.fav = fav;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public double getPrice() {        return price;    }    public void setPrice(double price) {        this.price = price;    }    public int getFav() {        return fav;    }    public void setFav(int fav) {        this.fav = fav;    }    @Override    public String toString() {        return "商品名:"+name+",收藏量"+this.fav+",价格:"+this.price+"\n";    }}

GoodsImpl.java

package collection.sort.newsitemsort;import java.util.ArrayList;import java.util.Collections;import java.util.List;public class GoodsImpl {    public static void main(String[] args) {        List<Goods> list =new ArrayList<Goods>();        list.add(new Goods("老马视频",100,2000));        list.add(new Goods("老高视频",50,2000));        list.add(new Goods("老裴视频",1000,1000));        System.out.println("排序前:"+list);    //  Collections.sort(list,new GoodsPriceComp());        Collections.sort(list,new GoodsFavCompare());        System.out.println("排序后:"+list);    }}

GoodsPriceCompare.java

package collection.sort.newsitemsort;import java.util.Comparator;/** * 实现Comparable接口，提高比较的条件 * 按价格排序的业务类 （降序） */public class GoodsPriceCompare implements Comparator<Goods> {    @Override    public int compare(Goods o1, Goods o2) {        return -(o1.getPrice()-o2.getPrice()>0?1:(o1.getPrice()==o2.getPrice()?0:-1));    }}

GoodsFavCompare.java

package collection.sort.newsitemsort;import java.util.Comparator;/** * 按收藏量排序的业务类 （升序） */public class GoodsFavCompare implements Comparator<Goods>{    @Override    public int compare(Goods o1, Goods o2) {        return o1.getFav()-o2.getFav();    }}

阅读全文

0 0