Java List集合中元素比较大小
2020-02-24 12:20 默默不语 阅读(11154) 评论(0) 编辑 收藏 举报list排序方法一Comparator形式:
1.比较数字
List<Shoes> all_shoes = new ArrayList<Shoes>(); Collections.sort(all_shoes, new Comparator<Shoes>(){ @Override /* * * int compare(String o1, String o2) 返回一个基本类型的整型 * 返回-1表示:shoes1.getSimilarity()大于等于shoes2.getSimilarity(), * 返回1表示:shoes1.getSimilarity()小于shoes2.getSimilarity(), * */ public int compare(Shoes shoes1, Shoes shoes2) { if (shoes1.getSimilarity()<shoes2.getSimilarity()){ return 1; }else{ return -1; } } }); System.out.println("比较后"); for(Shoes s:all_shoes) { System.out.println(s.getId()); System.out.println(s.getShoes_name()); System.out.println(s.getPrice()); System.out.println(s.getDeal()); System.out.println(s.getImage()); System.out.println(s.getShop_name()); System.out.println(s.getAddress()); System.out.println(s.getUrl()); System.out.println(s.getSource()); System.out.println(s.getSimilarity()); System.out.println("--------------------------"); }
运行结果(similarity按从大到小顺序排列):
2.字符串型
package dao; import java.util.ArrayList; import java.util.Collections; import java.util.Comparator; import java.util.List; /** *@author chenmeiqi *@version 2020年2月24日 下午12:13:17 */ public class test1 { public static void main(String[] args) { // TODO Auto-generated method stub List<String> keyList = new ArrayList<>(); keyList.add("abc"); keyList.add("fgh"); keyList.add("cvb"); System.out.println("排序前:"); for(String s:keyList) { System.out.println(s); } Collections.sort(keyList, new Comparator<String>(){ @Override public int compare(String o1, String o2) { /* * * int compare(String o1, String o2) 返回一个基本类型的整型, * * 返回负数表示:o1 小于o2, * * 返回0 表示:o1和o2相等, * * 返回正数表示:o1大于o2 * */ if (o1.compareTo(o2) > 0){ return 1; }else if (o1.compareTo(o2) > 0){ return 0; }else{ return -1; } } }); System.out.println("排序后:"); for(String s:keyList) { System.out.println(s); } } }
运行结果: