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這篇文章將為大家詳細講解有關如何進行Java list排序的解析,文章內容質量較高,因此小編分享給大家做個參考,希望大家閱讀完這篇文章后對相關知識有一定的了解。
此處Java list 排序主要用到Collections.sort方法:
package com.tom.compare; import java.util.ArrayList; import java.util.Collections; import java.util.Comparator; import java.util.List; public class CompareClient { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub List list = new ArrayList(); list.add(new Content(15000,"1asdfasd5000")); list.add(new Content(10000,"10000")); list.add(new Content(20000,"20000")); list.add(new Content(30000,"30000")); list.add(new Content(25000,"25000")); list.add(new Content(13000,"13000")); list.add(new Content(15000,"15000")); list.add(new Content(89000,"89000")); ContentComparator comp = new ContentComparator(); Collections.sort(list,comp); Content content; for(int i = 0; i < list.size(); i++){ content = (Content)list.get(i); System.out.println(" content.getName() " + content.getName()); } } } package com.tom.compare; import java.util.Comparator; public class ContentComparator implements Comparator { public int compare(Object o1, Object o2) { // TODO Auto-generated method stub Content c1 = (Content) o1; Content c2 = (Content) o2; if (c1.getKey() > c2.getKey()) { return 1; } else { if (c1.getKey() == c2.getKey()) { return 0; } else { return -1; } } } } package com.tom.compare; public class Content { private long key; private String name; public Content(long key, String name) { this.key = key; this.name = name; } public long getKey() { return key; } public void setKey(long key) { this.key = key; } public String getName() { return name; } public void setName(String name) { this.name = name; } }
結果是:
content.getName() 10000 content.getName() 13000 content.getName() 1asdfasd5000 content.getName() 15000 content.getName() 20000 content.getName() 25000 content.getName() 30000 content.getName() 89000
以下為按時間排序:
public static void sss() { String[] dates = { "2 Dec 2003 12:12:05", "2 Apr 2003 13:12:05", "2 Jan 2003 10:12:05", "2 Feb 2003 15:12:05", }; java.text.SimpleDateFormat f = new java.text.SimpleDateFormat("d MMM y HH:mm:ss",Locale.ENGLISH); try{ System.out.println("before:"); for(int i = 0; i<dates.length; i++) { System.out.println(dates[i]); } Arrays.sort(dates, new Comparator() { public int compare(Object o1, Object o2){ try{ SimpleDateFormat df = new java.text.SimpleDateFormat("d MMM y HH:mm:ss",Locale.ENGLISH); Date d1 = df.parse((String)o1); Date d2 = df.parse((String)o2); return d1.compareTo(d2); }catch(Exception e){e.printStackTrace();} return -1; } }); System.out.println("after:"); for(int i = 0; i<dates.length; i++) { System.out.println(dates[i]); } }catch(Exception e){e.printStackTrace();} }
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