getClass()

shana07

What is the correct sytanx for

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getClass()?

I don't know how to use it as I read java doc it is something like Class<? extends Object> ..what does it mean?
I need to know what class is that and need to do something like this

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 Class whatClass;

if (whatClass == BigInteger.class) 

{ do something ....}

Please share the correct syntax with me....Thank You

crossroadsk

See this example:

class GetTheClass
{
public static void main(String[] args)
{
Object obj = new Object();
String s = new String();
System.out.println(s.getClass());
System.out.println(obj.getClass());
}
}

It returns the classname of the object u used to call that method.

you can use this to know the classname

shana07

Quote:

Originally Posted by crossroadsk

See this example:

class GetTheClass
{
public static void main(String[] args)
{
Object obj = new Object();
String s = new String();
System.out.println(s.getClass());
System.out.println(obj.getClass());
}
}

It returns the classname of the object u used to call that method.

you can use this to know the classname

thank you...
One more thing can I get something like this:

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if (className == jonmath.java.math.MyBigInteger) 

{ //I need to do something only for this class.

  //Do I need to initialize it? something like this?

 // Class intClass = jonmath.java.math.MyBigInteger.class;

}

Please help..

prometheuzz

Quote:

Originally Posted by shana07

thank you...
One more thing can I get something like this:

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if (className == jonmath.java.math.MyBigInteger) 

{ //I need to do something only for this class.

  //Do I need to initialize it? something like this?

 // Class intClass = jonmath.java.math.MyBigInteger.class;

}

Please help..

You could use

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 if (className instanceof jonmath.java.math.MyBigInteger) {

    // ...

}

But if your code is going to be full of instanceof operators, you definatelly have a design flaw.

shana07

Quote:

Originally Posted by prometheuzz

You could use

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 if (className instanceof jonmath.java.math.MyBigInteger) {

    // ...

}

But if your code is going to be full of instanceof operators, you definatelly have a design flaw.

by doing that - compiler gives error: inverconvertible types
found : java.lang.Class
required: jonmath.java.math.MyBigInteger
Thanks for your reply....

prometheuzz

Quote:

Originally Posted by shana07

by doing that - compiler gives error: inverconvertible types
found : java.lang.Class
required: jonmath.java.math.MyBigInteger
Thanks for your reply....

Ah, I see. Run this demo to see how the instanceof operator is used:

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 public class InstanceofDemo {
 
    public static void main(String[] args) {   

        String s = "a string";

        Integer i = new Integer(1);  

        checkWithInstanceof(s);

        checkWithInstanceof(i);

        checkWithInstanceof(String.class);

        checkWithInstanceof(null);

    }
 
    public static void checkWithInstanceof(Object o) {

        if(o instanceof String) {

            System.out.println("'"+o+"' is a String.");

        } 

        else if(o instanceof Integer) {

            System.out.println("'"+o+"' is a Integer.");

        } 

        else if(o instanceof Class) {

            System.out.println("'"+o+"' is a Class.");

        } 

        else {

            System.out.println("'"+o+"' is unknown.");

        }

    }

}

getClass()

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re: getClass()

re: getClass()

re: getClass()

re: getClass()

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