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?
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The 'byte' keyword is used to declare a field that can store an 8-bit signed _____ integer.
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The 'case' keyword is used to create individual _____ in a switch statement.
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What is the function of the 'catch' keyword?
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The 'char' keyword is used to declare a field that can store a _____ character.
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What is a class in Java?
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The keyword 'const' has a function in Java.
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What does the 'continue' keyword do?
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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.
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What is the purpose of the 'do' keyword?
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The 'double' keyword is used to declare a field that can hold a _____.
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What does the 'else' keyword do?
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What is the 'enum' keyword used for?
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What does the 'extends' keyword signify in Java?
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Study Notes
Java Keywords Study Notes
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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.
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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.
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boolean: Data type for storing true or false values; can be used for method return types.
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break: Terminates the current block of execution, transferring control to the statement following the block. Can be used with labels for specific control flows.
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byte: Data type for an 8-bit signed two's complement integer, used in field declarations and method return types.
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case: Used in switch statements to define individual cases for control flow based on variable values.
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catch: Defines an exception handler that executes if an associated try block throws an exception. It checks for class compatibility with the thrown exception.
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char: Data type for a single 16-bit Unicode character, applicable in field and method return declarations.
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class: Defines the structure and behavior of objects, specifying fields, methods, interfaces, and inheritance relationships. Implicitly inherits from Object if no superclass is defined.
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const: Reserved keyword in Java, though not used. Constants are defined using the 'final' keyword instead.
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continue: Skips the current iteration of a loop and jumps to the end. Can be labeled for specific loop control.
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default: Used in switch statements to label a block executed when no case matches. Also applicable for default values in Java annotations.
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do: Works with while to create a do-while loop, executing the block at least once and then testing a condition for continued execution.
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double: Represents a 64-bit double precision floating-point number, used in field and method return type declarations.
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else: Complements if statements, defining an alternate block of code executed if the if condition evaluates to false.
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enum: Declares enumerated types in Java, which are specialized classes extending the base class Enum.
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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.