创建Employee类，在类中定义三个属性：编号，姓名，年龄，然后在构造方法里初始化这三个属性，最后在实现接口中的定义的CompareTo方法，将对象按编号升序排列。

代码如下：(程序可能有些错误，方法是对的，见谅)

import java.awt.List;

import java.util.ArrayList;

import java.util,Collection;

import java.util,Collections;

import java.util,Iterator;

import java.util,Scanner;

class Employee implements omparable{

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 setId(int age){

this.age=age;

}

Employee(int id,String name,int age){

this.id=id;this.name=name;this.age=age;

}

public int compareTo(Object e){

Employee o=(Employee)e;

if(this.id>o.id)return 1;

else if(this.id

}

}

public class Main{

public static void main(String[] args){

Scanner in=new Scanner(System.in);

ArrayList list=new ArrayList();

for(int i=0;i<3;i++){

int id=in,nextInt();

String str=in.next();

int age=in.nextInt();

list.add(new Employee(id,str,age));

}

Collections.sort(list);

System.out.print("[");

Iterator it=list.iterator();

while(it.hasNext()){

Employee e=(Employee) it.next();

System.out.print("Id= "+e.getId+"Name= "+e.getName()+"Age= "+e.getAge());

if(it.hasNext())System.out.print("，“)；

｝

System.out.println("]");

}

}