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 Code subject: java instanceof keyword
PostPosted: Fri Jan 30, 2009 1:06 am 
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Java instanceof keyword :
This is an example on java instanceof keyword .instanceof keyword is used when avoid invalid casting in the runtime .

Code:
public class Main {

    public static void main(String[] args) {
           
         A classA=new A();
         B classB=new B();
         
         if(classA instanceof A)
         {
             System.out.println("Correct");
         }
         else
             System.out.println("Wrong ");
         if(classA instanceof Base)
         {
             System.out.println("Correct");
         }
         else
             System.out.println("Wrong ");
         
         if(classB instanceof A)
         {
             System.out.println("Correct");
         }
         else
             System.out.println("Wrong ");
         
         if(classB instanceof Base)
         {
             System.out.println("Correct");
         }
         else
             System.out.println("Wrong ");
         
         
    }

}
interface Base
{
   
}
class A implements Base
{
     public A()
     {
         
     }
}
class B extends A
{
    public B()   
    {
       
    }
}

If you have a part of your system generating a multiple types of objects , you will need to know the types of these objects before you start your logic on it .

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Currenlty programming with : java , html , php , and javascript . (OCJP-6 certified )


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