?? test.java
字號:
class Base
{
public boolean equals(Object obj)
{
if (obj instanceof Base)
//...
}
}
class Derived extends Base
{
public boolean equals(Object obj)
{
if (obj != null && getClass() == obj.getClass() &&
super.equals(obj))
//...
}
}
Base b = new Base();
Derived d = new Derived();
if (d.equals(b)) //Always false
if (b.equals(d)) //Potentially true
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