Set operation -- custom comparable comparer

From , 4 Years ago, written in Java, viewed 52 times.

1.
package s0223排序比较器_推荐使用comparator;
//排序比较的2种实现方法
//1. 实体类                                 java.lang.Comparable Comparato
//2.自定义比较器,implements java.util.Comparator,然后重写compare()方法
public class Comparator1 implements java.util.Comparator<String> {
 
 
        public int compare(String o1, String o2) {
      int len1=o1.length();
      int len2=o2.length();
                return len1-len2;
        }
 
 
 
}
 
2.
package s0223排序比较器_推荐使用comparator;
 
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
 
public class Main {
 
        public static void  main(String [] args){
 
    String[] str={"a","abcd","abc","def"};
    List<String> list=Arrays.asList(str);
    System.out.println("排序前:"+list);
 
//    Collections.sort(list);
    Collections.sort(list,new Comparator1());//对指定列表排序,使用指定比较器 ,这里是从小到大排序
    System.out.println("排序后"+list);
        }
 
}
 

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Set operation -- custom comparable comparer

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