Java Keywords 9.4.2 Quiz: Test Your Knowledge

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What does the Java 'implements' keyword do?

Declares a variable that can hold a 32-bit signed integer

Creates new objects

Is used to implement an interface (correct)

Tests a condition and executes a block if true

What is the purpose of the Java 'null' keyword?

Indicates that a reference does not refer to anything (correct)

Declares a Java package

Tests whether the object is an instance of a specified class or interface

Declares a 64-bit integer variable

When is the Java 'protected' keyword used?

As an access modifier to indicate that a method or variable may be accessed only in the class in which it is declared (correct)

To specify that a method is implemented in native code using JNI

To declare a variable that can hold a 64-bit integer

To declare a Java package that includes classes

What is the role of the Java 'new' keyword?

Creates new objects Signup and view all the answers

What does the Java 'instanceof' keyword test?

Tests whether the object is an instance of a specified class or interface Signup and view all the answers

When is the Java 'native' keyword used?

To specify that a method is implemented in native code using JNI Signup and view all the answers

What does the 'public' keyword indicate in Java?

It is used to indicate that an item is accessible anywhere Signup and view all the answers

When is the 'return' keyword used in Java?

To return from a method when its execution is complete Signup and view all the answers

What does the 'volatile' keyword indicate in Java?

It is used to indicate that a variable may change asynchronously Signup and view all the answers

What is the purpose of the 'static' keyword in Java?

To indicate that a variable or method is a class method Signup and view all the answers

When would you use the 'transient' keyword in Java?

In serialization to indicate that a variable will not be serialized Signup and view all the answers

What does the 'this' keyword refer to in Java?

The current object in a method or constructor Signup and view all the answers

When would you use the 'throws' keyword in Java?

To declare an exception and propagate checked exceptions Signup and view all the answers

What is the role of the 'throw' keyword in Java?

To explicitly throw an exception Signup and view all the answers

What does the 'try' keyword initiate in Java?

A block of code that will be tested for exceptions Signup and view all the answers

What is the significance of the 'strictfp' keyword in Java?

To restrict floating-point calculations to ensure portability Signup and view all the answers

Study Notes

Java Keywords

Access Modifiers

The public keyword indicates that the class, method, or variable can be accessed from anywhere in the program.
The protected keyword is used when a class, method, or variable can be accessed within the same class and its subclasses.

Object Creation

The new keyword is used to create a new instance of a class.

Type Checking

The instanceof keyword tests whether an object is of a particular type or not.

Multithreading

The volatile keyword indicates that a variable's value can change unexpectedly, and the program should always read the variable's current value.

Exception Handling

The throws keyword is used to declare that a method may throw an exception.
The throw keyword is used to explicitly throw an exception.
The try keyword initiates a block of code that can throw an exception.

Memory Management

The transient keyword is used to indicate that a variable should not be serialized.

Classes and Objects

The this keyword refers to the current object of the class.

Implementation

The implements keyword is used to indicate that a class implements an interface.

Null Values

The null keyword represents a null reference or a variable that has no value.

Native Methods

The native keyword is used to declare a method that is implemented in a language other than Java.

Floating-Point Arithmetic

The strictfp keyword is used to restrict the precision of floating-point calculations to ensure portability.

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Description

Test your knowledge of Java keywords with this quiz. Explore the usage and functionality of keywords such as 'if', 'implements', 'import', 'instanceof', and 'int'.