java數組arrays排序，arraylist java 排序_java的arraylist排序示例(arraylist用法)

寫了一個java數組排序示例，這里分享給大家共同學習

package com.yonyou.test;

java數組arrays排序。import java.util.ArrayList;

import java.util.Collections;

import java.util.Comparator;

java降序排序，import java.util.List;

public class Test {

public static void main(String[] args) {

java hashmap用法，Student zlj = new Student("丁曉宇", 21);

Student dxy = new Student("趙四", 22);

Student cjc = new Student("張三", 11);

java數組初始化、Student lgc = new Student("劉武", 19);

List studentList = new ArrayList();

studentList.add(zlj);

java 數組排序，studentList.add(dxy);

studentList.add(cjc);

studentList.add(lgc);

java 輸入？System.out.println("按照年齡排序：");

Collections.sort(studentList, new SortByAge());

for (Student student : studentList) {

java類，System.out.println(student.getName() + " / " + student.getAge());

}

System.out.println(" ========= ");

System.out.println("按照姓名排序");

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;

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;

}

}