List 集合排序

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);
		}
	}
}