The difference between instanceof and class : Intanceof « Language Basics « Java

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The difference between instanceof and class

 
// : 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());

  }
} ///:~



           
         
  

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