package edu.cqu;

import java.util.ArrayList;

import java.util.HashSet;

import java.util.List;

import java.util.Set;

/**

* 自定义的类应该实行equals、hashCode和toString函数。

* 利用Eclipse的功能可以很方便的生成equals和hashCode。

* @author liuji

*

*/

public class Student {

private String name;

private String id;

public Student(String name, String id) {

super();

this.name = name;

this.id = id;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

@Override

public int hashCode() {

final int prime = 31;

int result = 1;

result = prime * result + ((id == null) ? 0 : id.hashCode());

return result;

}

@Override

public boolean equals(Object obj) {

if (this == obj)

return true;

if (obj == null)

return false;

if (getClass() != obj.getClass())

return false;

Student other = (Student) obj;

if (id == null) {

if (other.id != null)

return false;

} else if (!id.equals(other.id))

return false;

return true;

}

@Override

public String toString() {

StringBuffer buffer=new StringBuffer();

buffer.append("id=");

buffer.append(id);

buffer.append("\n");

buffer.append("name=");

buffer.append(name);

buffer.append("\n");

return buffer.toString();

}

public static void main(String args[])

{

Student s1=new Student("B","1");

Student s2=new Student("A","1");

List<Student> l=new ArrayList<Student>();

l.add(s1);

l.add(s2);

System.out.println(l);

Set<Student> s=new HashSet<Student>();

s.add(s1);

s.add(s2);

System.out.println(s);

}

}