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[干货分享]如何实现对ArrayList排序 sort

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SRU }-  
package com.collection;import java.util.ArrayList;import java.util.Collections;import java.util.Comparator;import java.util.List;public class Test {     public static void main(String[] args) {          Student zlj = new Student("丁晓宇", 21);          Student dxy = new Student("赵四", 22);          Student cjc = new Student("张三", 11);          Student lgc = new Student("刘武", 19);          List<Student> studentList = new ArrayList<Student>();          studentList.add(zlj);          studentList.add(dxy);          studentList.add(cjc);          studentList.add(lgc);          System.out.println("按年龄升序:");          Collections.sort(studentList, new SortByAge());          for (Student student : studentList) {           System.out.println(student.getName() + " / " + student.getAge());          }          System.out.println();          System.out.println("按姓名排序:");          Collections.sort(studentList, new SortByName());          for (Student student : studentList) {           System.out.println(student.getName() + " / " + student.getAge());          }         }        }        class SortByAge implements Comparator {         public int compare(Object o1, Object o2) {          Student s1 = (Student) o1;          Student s2 = (Student) o2;          return s1.getAge().compareTo(s2.getAge());//          if (s1.getAge() > s2.getAge())//           return 1;//          return -1;         }        }        class SortByName implements Comparator {         public int compare(Object o1, Object o2) {          Student s1 = (Student) o1;          Student s2 = (Student) o2;          return s1.getName().compareTo(s2.getName());         }} 6]%SSq&  
输出结果: wwvS05=[T  
按年龄升序:张三 / 11刘武 / 19丁晓宇 / 21赵四 / 22按姓名排序:丁晓宇 / 21刘武 / 19张三 / 11赵四 / 22
关键词: java
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