Mega Code Archive
The difference between instanceof and class
<![CDATA[
// : c10:FamilyVsExactType.java
// The difference between instanceof and class
// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
// www.BruceEckel.com. See copyright notice in CopyRight.txt.
class Base {
}
class Derived extends Base {
}
public class FamilyVsExactType {
static void test(Object x) {
System.out.println("Testing x of type " + x.getClass());
System.out.println("x instanceof Base " + (x instanceof Base));
System.out.println("x instanceof Derived " + (x instanceof Derived));
System.out.println("Base.isInstance(x) " + Base.class.isInstance(x));
System.out.println("Derived.isInstance(x) "
+ Derived.class.isInstance(x));
System.out.println("x.getClass() == Base.class "
+ (x.getClass() == Base.class));
System.out.println("x.getClass() == Derived.class "
+ (x.getClass() == Derived.class));
System.out.println("x.getClass().equals(Base.class)) "
+ (x.getClass().equals(Base.class)));
System.out.println("x.getClass().equals(Derived.class)) "
+ (x.getClass().equals(Derived.class)));
}
public static void main(String[] args) {
test(new Base());
test(new Derived());
}
} ///:~
]]>