Java Keywords Study Notes

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Questions and Answers

The keyword 'abstract' is used to declare a class or method to be _____

abstract

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

It is used to make an assertion — a statement that the programmer believes is always true.

The 'boolean' keyword is used to declare a field that can store a _____ value.

boolean

What does the 'break' keyword do?

It resumes program execution at the statement immediately following the current enclosing block or statement. Signup and view all the answers

The 'byte' keyword is used to declare a field that can store an 8-bit signed _____ integer.

two's complement Signup and view all the answers

The 'case' keyword is used to create individual _____ in a switch statement.

cases Signup and view all the answers

What is the function of the 'catch' keyword?

Defines an exception handler. Signup and view all the answers

The 'char' keyword is used to declare a field that can store a _____ character.

16-bit Unicode Signup and view all the answers

What is a class in Java?

A type that defines the implementation of a particular kind of object. Signup and view all the answers

The keyword 'const' has a function in Java.

False Signup and view all the answers

What does the 'continue' keyword do?

Resumes program execution at the end of the current loop body. Signup and view all the answers

The 'default' keyword can optionally be used in a switch statement to label a block of statements to be executed if no _____ matches the specified value.

case Signup and view all the answers

What is the purpose of the 'do' keyword?

Used in conjunction with while to create a do-while loop. Signup and view all the answers

The 'double' keyword is used to declare a field that can hold a _____.

64-bit double precision IEEE 754 floating-point number Signup and view all the answers

What does the 'else' keyword do?

Used in conjunction with if to create an if-else statement. Signup and view all the answers

What is the 'enum' keyword used for?

It is used to declare an enumerated type. Signup and view all the answers

What does the 'extends' keyword signify in Java?

It specifies the superclass in a class declaration. Signup and view all the answers

Study Notes

Java Keywords Study Notes

abstract: Declares classes or methods with no implementation. Only subclasses must implement abstract methods or remain abstract. Instances of an abstract class cannot be created.
assert: Introduced in J2SE 1.4 for assertions, which are statements that should always be true. If false, an AssertionError is triggered, aiding in debugging.
boolean: Data type for storing true or false values; can be used for method return types.
break: Terminates the current block of execution, transferring control to the statement following the block. Can be used with labels for specific control flows.
byte: Data type for an 8-bit signed two's complement integer, used in field declarations and method return types.
case: Used in switch statements to define individual cases for control flow based on variable values.
catch: Defines an exception handler that executes if an associated try block throws an exception. It checks for class compatibility with the thrown exception.
char: Data type for a single 16-bit Unicode character, applicable in field and method return declarations.
class: Defines the structure and behavior of objects, specifying fields, methods, interfaces, and inheritance relationships. Implicitly inherits from Object if no superclass is defined.
const: Reserved keyword in Java, though not used. Constants are defined using the 'final' keyword instead.
continue: Skips the current iteration of a loop and jumps to the end. Can be labeled for specific loop control.
default: Used in switch statements to label a block executed when no case matches. Also applicable for default values in Java annotations.
do: Works with while to create a do-while loop, executing the block at least once and then testing a condition for continued execution.
double: Represents a 64-bit double precision floating-point number, used in field and method return type declarations.
else: Complements if statements, defining an alternate block of code executed if the if condition evaluates to false.
enum: Declares enumerated types in Java, which are specialized classes extending the base class Enum.
extends: Used in classes to indicate superclass inheritance and in interfaces for specifying superinterfaces. Facilitates adding or modifying functionality in subclasses or subinterfaces.

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Description

This quiz covers essential Java keywords such as abstract, assert, boolean, and more. Each keyword is briefly explained with its purpose and usage in Java programming. Perfect for students looking to deepen their understanding of Java fundamentals.