欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页

List 集合排序

程序员文章站 2022-03-19 22:21:09
...
建立一个Student JavaBean 的这样的一个class. 并且生成Getter和Setter方法.
package pack.java.demo.test;

import java.util.Comparator;

public class Student implements Comparable<Student>{
	public int id;
	public String name;
	public int age;
	public int getId() {
		return id;
	}
	public String getName() {
		return name;
	}
	public int getAge() {
		return age;
	}
	public void setId(int id) {
		this.id = id;
	}
	public void setName(String name) {
		this.name = name;
	}
	public void setAge(int age) {
		this.age = age;
	}
	public Student() {
		super();
		// TODO Auto-generated constructor stub
	}
	public Student(int id, String name, int age) {
		super();
		this.id = id;
		this.name = name;
		this.age = age;
	}
	
	@Override
	public int hashCode() {
		// TODO Auto-generated method stub
		return super.hashCode();
	}
		
	@Override
	public String toString() {
		// TODO Auto-generated method stub
		return super.toString();
	}
	
	@Override
	public boolean equals(Object obj) {
		// TODO Auto-generated method stub
		return super.equals(obj);
	}
	
	
	public int compareTo(Student o){
		if(o == null){
		return -1;
		}
		if (this == o)
		return 0;
		return this.name.compareTo(o.name);
		} 	
}

 //新建一个Teacher 类.并且生成Getter和Setter方法.

 

package pack.java.demo.test;

import java.util.Comparator;

public class Teacher implements Comparator<Teacher>{
	private int id;
	private String name;
	private int age;
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	public int compare(Teacher o1, Teacher o2) {
		//return o1.getAge()>o2.getAge()?-1:1;
		return o1.getName().equalsIgnoreCase(o2.getName())?1:-1;
	}
	
	public Teacher(int id, String name, int age) {
		super();
		this.id = id;
		this.name = name;
		this.age = age;
	}
	
	public Teacher() {
		super();
		// TODO Auto-generated constructor stub
	}
	
	
}

 

 

 

//测试类;

package pack.y2.ssh.test;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;

public class Test {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		new Test().listStudentSort();
		new Test().listTeacher();
	}
	
	public void listStudentSort(){
		Student stu1=new Student(1,"ZHT",20);
		Student stu2=new Student(6,"AP",19);
		Student stu3=new Student(3,"HF",12);
		Student stu4=new Student(4,"BDF",18);
		
		List<Student> list=new ArrayList<Student>();
		list.add(stu1);
		list.add(stu2);
		list.add(stu3);
		list.add(stu4);
		
		Collections.sort(list);
		
		for(Student s:list){
			System.out.println(s.id+","+s.name);
		}
	}
	
	public void listTeacher(){
		List<Teacher> list=new ArrayList<Teacher>();
		list.add(new Teacher(1,"VS",23));
		list.add(new Teacher(3,"FS",83));
		list.add(new Teacher(2,"AV",28));
		
		Collections.sort(list, new Teacher());
		
		for(Iterator<Teacher> it=list.iterator();it.hasNext();){
			Teacher t=it.next();
			System.out.println(t.getId()+","+t.getName()+","+t.getAge());
		}
	}
	

	public void listSort(){
		// TODO Auto-generated method stub
		List list=new ArrayList();
		list.add("D");
		list.add("A");
		list.add("C");
		list.add("B");
	
		Collections.sort(list);
		Iterator<Object> it= list.iterator();
		
		while (it.hasNext()) {
			Object obj=it.next();
			System.out.println(obj);
		}
	}
}

 

 

相关标签: SSH