overrideequalserror.java

疯狂Java讲义_源码(含Java设计模式CHM

/**
 * Description:
 * <br/>Copyright (C), 2005-2008, Yeeku.H.Lee
 * <br/>This program is protected by copyright laws.
 * <br/>Program Name:
 * <br/>Date:
 * @author  Yeeku.H.Lee [e-mail]
 * @version  1.0
 */
 
//定义一个Person类
class Person
{
	//重写equals方法，提供自定义的相等标准
	public boolean equals(Object obj)
	{
		//不加判断，总是返回true，即Person对象与任何对象都相等
		return true;
	}
}
//定义一个Dog空类
class Dog{}
public class OverrideEqualsError
{
	public static void main(String[] args) 
	{
		Person p = new Person();
		System.out.println("Person对象是否equals Dog对象？" + p.equals(new Dog()));
		System.out.println("Person对象是否equals String对象？" + p.equals(new String("Hello")));
	}
}