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What are the possible ways of using NULL pointer?

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What are the possible ways of using NULL pointer?

Some uses of the null pointer are: a) To initialize a pointer variable when that pointer variable isn’t assigned any valid memory address yet. b) To pass a null pointer to a function argument when we don’t want to pass any valid memory address. c) To check for null pointer before accessing any pointer variable.

Why do we get Java Lang NullPointerException?

NullPointerException is thrown when a reference variable is accessed (or de-referenced) and is not pointing to any object. This error can be resolved by using a try-catch block or an if-else condition to check if a reference variable is null before dereferencing it.

What is null reference and NullPointerException?

NullPointerException s are exceptions that occur when you try to use a reference that points to no location in memory (null) as though it were referencing an object. Calling a method on a null reference or trying to access a field of a null reference will trigger a NullPointerException .

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How does Java handle null pointer exception for integers?

3. Best Ways to Avoid NullPointerException

  1. 3.1. Use Ternary Operator.
  2. 3.2. Use Apache Commons StringUtils for String Operations.
  3. 3.3. Fail Fast Method Arguments.
  4. 3.4. Consider Primitives instead of Objects.
  5. 3.5. Carefully Consider Chained Method Calls.
  6. 3.6. Use valueOf() in place of toString()
  7. 3.7.
  8. 3.8.

What are the types of exceptions in Java?

Types of Exception in Java with Examples

  • ArithmeticException. It is thrown when an exceptional condition has occurred in an arithmetic operation.
  • ArrayIndexOutOfBoundsException.
  • ClassNotFoundException.
  • FileNotFoundException.
  • IOException.
  • InterruptedException.
  • NoSuchFieldException.
  • NoSuchMethodException.

Is NullPointerException a runtime exception?

NullPointerException is a runtime exception in Java that occurs when a variable is accessed which is not pointing to any object and refers to nothing or null. Since the NullPointerException is a runtime exception, it doesn’t need to be caught and handled explicitly in application code.