package com.test.collection; import java.util.HashMap;
import java.util.Map; /**
* 重写equals & hashcode
*
* 1.如果两个对象的equals为true ,则hashCode也为true
* 2.重写equals时,必须重写hashCode(保证equals为true ,hashCode也为true)
* @author chenx
*
*/
public class Student { public Student(int id, String name) {
super();
this.id = id;
this.name = name;
} private int id;
private String name;
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + id;
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 != other.id)
return false;
return true;
}
}