java對應List排序

package com.wangyin.iss.test;


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("丁曉宇", 21);
Student dxy = new Student("趙四", 22);
Student cjc = new Student("張三", 11);
Student lgc = new Student("劉武", 11);
List<Student> studentList = new ArrayList<Student>();
studentList.add(zlj);
studentList.add(dxy);
studentList.add(cjc);
studentList.add(lgc);
System.out.println("按照年齡排序：");
Collections.sort(studentList, new SortByAge());
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;
if (s1.getAge() > s2.getAge())
return 1;
else if (s1.getAge() == s2.getAge()) {
return 0;
}
return -1;
}
}


class SortByName implements Comparator {
public int compare(Object o1, Object o2) {
Student s1 = (Student) o1;
Student s2 = (Student) o2;
if (s1.getName().compareTo(s2.getName()) < 0)
return -1;
else if (s1.getName().compareTo(s2.getName()) > 0) {
return 1;
}
return 0;
}
}


class Student {
private int age;
private String name;


public int getAge() {
return age;
}


public void setAge(int age) {
this.age = age;
}


public String getName() {
return name;
}


public void setName(String name) {
this.name = name;
}


public Student(String name, int age) {
this.age = age;
this.name = name;
}
}