Mastering Java: The Ultimate Quiz for 'Thinking in Java'

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Dive into the depths of Java with our quiz based on "Thinking in Java, Fourth Edition" by Bruce Eckel. Test your knowledge, solidify concepts, and prepare for certification with challenging questions and insightful feedback.

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

Which of these is a result of calling the default 'toString()' method in Java?

A unique identifier of the object
A string representation of the object's fields
The class name followed by the hash code of the object
The memory location of the object

The correct answer is: The class name followed by the hash code of the object

The default 'toString()' method in Java returns a string representation of an object. It includes the class name followed by the hash code of the object, representing its memory address. Option A is incorrect because a unique identifier for an object is usually assigned by the JVM, not the 'toString()' method. Option B is incorrect because while the default 'toString()' method may include certain fields, this is not guaranteed and can be overridden by a custom implementation. Option D is incorrect because the memory location of an object is not the same as its hash code.