Java Source Codes

Example of instanceof Operator

class Base {
}

class Derived extends Base {
}

/**
* Demo for instanceof Operator
* @author jimmi.prajapati
*
*/
public class InstanceofDemo {

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());

}
}

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