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javaexception
Ankit Mansinghani
Ankit Mansinghani

Reputation: 1

Exception in java with NullPointerException how to do it without throw?

What is the programming implementation of NullPointerException in java. Having a book which describe NullPointerException ,and done using first throw it using throw statement. But how to implement this exception in simple try catch block without using throw.

like we can throw ArithmetcException by doing throw new ArithmetricException() or to generate the exception we do in

try { 
  a=b/0;
} catch(ArithmeticException x);

Like the above, how to generate NullPointerException without explicitly throwing it?

Upvotes: 0

Views: 64

Answers (3)

Myroslav
Myroslav

Reputation: 1

You can easily throw NullPointerException , just use this code

try{
  String nullString = null;
  nullString.isEmpty();
catch(NullPointerException nex){
  System.out.println("NullPointerException:"+nex);
}

The exception will be thrown because you are trying to call isEmpty() method on a null object.

Upvotes: 0

Eran
Eran

Reputation: 393801

Any method call performed on any null object reference would cause NullPointerException.

String s = null;
s.toString();

Upvotes: 1

Chris Thompson
Chris Thompson

Reputation: 35598

If I understand correctly:

Object obj = null;
obj.equals(this);

Will cause an NullPointerException.

Upvotes: 1

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