java程序-类的高级特性

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<o.id)return -1;return 0;

  }

}

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("]");

  }

}

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