Introduction to Java Programming and Data Structures, Comprehensive Version Plus MyProgrammingLab with Pearson EText -- Access Card Package
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Chapter 9.5, Problem 9.5.3CP

Explanation of Solution

NullPointerException:

  • It is a RuntimeException which is thrown when a program tries to use an object reference that has the “null” value (a special value assigned to an object).
  • In other words a NullPointerException occurs when a null reference variable is used to access the members of an object.

These also include:

  • Modifying or accessing a null object’s field...

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