How to Use InstanceOf Operator in Java


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question 1 of 3

Consider the following code that upcasts and downcasts variables. Which of the following is the correct use of instance of to make sure the downcast is OK?

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1. Instanceof returns _____ if the value of the object is null.

2. Consider the following code. Which of the following correctly checks if author is a String array?

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About This Quiz & Worksheet

Use these questions to make sure you understand how to use instanceof when working in Java. You will be quizzed on different ways this command is used.

Quiz & Worksheet Goals

In this quiz you'll find out if you remember:

  • Instanceof returns
  • How to check for a String array
  • Reading Java code regarding instanceof

Skills Practiced

  • Reading comprehension - ensure that you draw the most important information from the material, such as why instanceof would be running a downcast
  • Defining key concepts - ensure that you can accurately define main phrases, such as instanceof and downcast in Java
  • Information recall - access the knowledge you've gained regarding correct uses of instanceof

Additional Learning

For a more complete understanding of Java language, review the lesson titled How to Use InstanceOf Operator in Java. You will learn about:

  • The two possible returns for the instanceof command
  • Examples of instanceof
  • Common uses for instanceof in Java