自定义比较器CustomComparator

package com.list;

import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;

public class CustomComparator {
    public static void main(String[] args) {
        List<String> list=new ArrayList<String>();
        list.add("a");
        list.add("c");
        list.add("b");
        for (String str : list) {
            System.out.println("---1---"+str);
        }
        list.sort(new Comparator<String>() {
            @Override
            public int compare(String o1, String o2) {
                int compareTo = o1.compareTo(o2);
                return compareTo;
            }
        });
        for (String str : list) {
            System.out.println("---2---"+str);
        }
    }
}

结果

---1---a
---1---c
---1---b
---2---a
---2---b
---2---c