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Keywords in Java

Quick Summary & Key Takeaways

  • • Subject Focus: Java Notes in English (BCA / B.Tech Syllabus)
  • • Core Topic: Keywords in Java - General Topics
  • • Overview: What are Keywords in Java? Keywords are predefined, reserved words in the Java language that have a special meaning to the compiler. They are the build...
  • • Key Concepts: Java keywords, Reserved words usage Hindi, Keyword categories,

What are Keywords in Java?

Keywords are predefined, reserved words in the Java language that have a special meaning to the compiler. They are the building blocks of the language's syntax. Because they are reserved, you cannot use them as names for your variables, methods, classes, or any other identifiers.

Key Characteristics:
  • Reserved: They are part of the Java syntax and cannot be used as identifiers. Trying to do so will result in a compilation error.
  • Lowercase: All Java keywords are written in lowercase.
  • Special Meaning: Each keyword has a specific function that the Java compiler understands.

Example of Misuse: 

// This code will not compile because `int` is a keyword.
int int = 10; // Compile-time error: ' expected'

Common Categories of Keywords:
  • Data Types: byte, short, int, long, float, double, char, boolean, void.
  • Control Flow: if, else, switch, case, default, for, while, do-while, break, continue, return.
  • Class and Object Related: class, interface, enum, extends, implements, new, this, super, instanceof.
  • Access & Other Modifiers: public, private, protected, static, final, abstract, synchronized.
  • Exception Handling: try, catch, finally, throw, throws.

Note: While true, false, and null seem like keywords, they are technically considered literals. Similarly, const and goto are reserved words but are not used in the language.

Frequently Asked Questions (FAQs)

What are Keywords in Java?.
Understanding Keywords in Java is fundamental to mastering Java Notes in English. It covers crucial concepts, solved problems, and revision points essential for academic and entrance exam success.
You can read free solved examples, detailed explanations, and key formulas for Keywords in Java directly on the NotesMedia website or by downloading the NotesMedia App.

In this Chapter

Keywords in Java
BCA || Java 2024 Paper || MDSU Exam Paper
What is Java, Characteristics of Java - What is Java and its Features
Difference between Java and C++
Applications of Java Programming
OOPs Concepts in Java
What are JVM and JRE
Features of JAVA
What is a Java Bean and its Advantages
Difference between Java and JavaScript
JIT Compiler
What is a Control Statement (structure)
What is a variable?
Java URL Class
What is Java Swing and its methods
Operators in Java
Classes & Methods in Java
Inheritance in Java
instanceof Operator
Tokens in Java
Data Types in Java
Constructors in Java
Object-Oriented Design
Conditional Operator
Constants in Java
Reference Variables
Type Casting in Java
Literals in Java
Identifiers in Java
Arrays in Java
Anonymous Arrays in Java
Access Modifiers in Java
Enum Data Type in Java
The `super` Keyword in Java
The `static` Keyword in Java
The `final` Keyword in Java
The `new` Operator in Java
Method Types in Java
Method Overloading in Java
Method Overriding in Java
Method Hiding in Java
Class & Object in Java
Difference Between Class & Object in Java
Math Class in Java
Abstraction in Java
Adapter Pattern in Java
Packages in Java
Class vs. Structure in Java
Exception Handling in Java