Java Example that generates General exceptions Like NullPointerException etc.

Write a program that generates exceptions of type NullPointerException, NegativeArraySizeException, and IndexOutOfBoundsException. Record the catching of each exception by displaying the message stored in the exception object and the stack trace record.

public class TestSimple {

  public static void main(String args[]) {
    int result = 0;                                                    // Somewhere to store a result.
    int arraySize = 3;
    int badSize = -1;                                                  // A negative size to generate NegativeArraySizeException.
    int[] array = null;                                                // Define an integer array variable.

    for(int choice = 0; choice<3 ; ++choice)
    try {
      switch(choice) {
        case 0:
         result = array[0];                                            // Generates a NullPointerException.
         break;
        case 1:
         array = new int[badSize];                                     // Generates a NegativeArraySizeException.
         break;
        case 2:
         array = new int[arraySize];
         result = array[arraySize];                                    // Generates an ArrayIndexOutOfBoundsException.
         break;
      }
    } catch(NullPointerException e) {                                  // Catch the NullPointerException:
      System.out.println("\nNullPointerException Exception caught. " +
                         "Message in NullPointerException is:\n" +
                         "\n" + e + "\n");
      System.out.println("The contents of the stack trace are:\n");
      e.printStackTrace();
    } catch(NegativeArraySizeException e) {                            // Catch the NegativeArraySizeException:
      System.out.println("\nNegativeArraySizeException Exception caught. " +
                         "Message in NegativeArraySizeException is:\n" +
                         "\n" + e + "\n");
      System.out.println("The contents of the stack trace are:\n");
      e.printStackTrace();
    } catch(ArrayIndexOutOfBoundsException e) {                        // Catch the ArrayIndexOutOfBoundsException:
      System.out.println("\nArrayIndexOutOfBoundsException Exception caught. " +
                         "Message in ArrayIndexOutOfBoundsException is:\n" +
                         "\n" + e + "\n");
      System.out.println("The contents of the stack trace are:\n");
      e.printStackTrace();
    }
  }
}

Output of Above Java Program
NullPointerException Exception caught. Message in NullPointerException is:

java.lang.NullPointerException

The contents of the stack trace are:

java.lang.NullPointerException
at  TestSimple.main( TestSimple.java:13)

NegativeArraySizeException Exception caught. Message in NegativeArraySizeException is:

java.lang.NegativeArraySizeException

The contents of the stack trace are:

java.lang.NegativeArraySizeException
at  TestSimple.main( TestSimple.java:16)

ArrayIndexOutOfBoundsException Exception caught. Message in ArrayIndexOutOfBoundsException is:

java.lang.ArrayIndexOutOfBoundsException: 3

The contents of the stack trace are:

java.lang.ArrayIndexOutOfBoundsException: 3
at  TestSimple.main( TestSimple.java:20)