请教各位大神，为什么我代码中size跑到了最后去判断，而且是什么意思呀

package com.imcok;

public class shouji {

 double size;

String cpu;

String memory;

@Override

public boolean equals(Object obj) {

if (this == obj)

return true;

if (obj == null)

return false;

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

return false;

shouji other = (shouji) obj;

if (cpu == null) {

if (other.cpu != null)

return false;

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

return false;

if (memory == null) {

if (other.memory != null)

return false;

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

return false;

if (Double.doubleToLongBits(size) != Double

.doubleToLongBits(other.size))

return false;

return true;

}

}