为什么我这里两对象不同类型相同属性的值用equals()方法判断是相同的呢？

public class Phone {

int screen=1;

public float a() {

float screen=1;

return screen;

}

@Override

public boolean equals(Object obj) {

if (this == obj)

return true;

if (obj == null)

return false;

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

return false;

Phone other = (Phone) obj;

if (screen != other.screen)

return false;

return true;

}

public static void main(String[] args) {

// TODO Auto-generated method stub

Phone phone1=new Phone();

phone1.screen=1;

Phone phone2=new Phone();

phone2.a();

if(phone1.equals(phone2))

System.err.println("两对象相同  phone1.screen:"+phone1.screen+"  phone2.a():"+phone2.a());

else

System.out.println("两对象不相同  phone1.screen:"+phone1.screen+"  phone2.a():"+phone2.a());

}

}

视频里老师说equals()方法里判断类型不同会返回false  但我这段代码不同类型也返回true  我哪里理解错了呢？