Keywords in Java
⏱️ 5 min read • Beginner Level • Lesson 9
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Java keywords are reserved words that have predefined meanings in the Java language. These words are part of Java syntax and cannot be used as variable names, method names, or class names.
Key Points
Important Facts About Java Keywords
- Keywords are special reserved words.
- They have predefined meanings in Java.
- Keywords cannot be used as identifiers.
Java Language Keywords
| abstract | continue | for | new |
| switch | assert | default | goto |
| package | synchronized | boolean | do |
| if | private | this | break |
| double | implements | protected | throw |
| byte | else | import | public |
| throws | case | enum | instanceof |
| return | transient | catch | extends |
| int | short | try | char |
| final | interface | static | void |
| class | finally | long | strictfp |
| volatile | const | float | native |
| super | while |
Reserved Keywords
Reserved Keywords (Not in Use)
const goto (Reserved but not implemented)
Added in Java Versions:
- Java 1.2 →
strictfp - Java 1.4 →
assert - Java 1.5 →
enum
Example Using Java Keywords
The following program uses keywords such as
public,
class,
static,
and
void.
public class Demo {
public static void main(String[] args) {
System.out.println("Java Keywords Example");
}
}
public, class, static, and
void are predefined words recognized by the Java compiler.
- Keywords are predefined reserved words in Java.
- They cannot be used as identifiers.
- They define syntax and structure of Java programs.
Interview Questions ⭐
🧠 Test your understanding with a quick quiz
🚀 Quick Knowledge Check
Topic: Keywords | Language: Java
Q1. Which of the following is a reserved keyword but not used in Java?
Q2. Which of the following can keywords NOT be used as?
Q3. What does the 'strictfp' keyword ensure?
Q4. Which keyword was added in Java 1.5?
Q5. Which of the following is TRUE about the keyword 'const' in Java?
Q6. Which keyword was added in Java 1.2?
Q7. What are Java keywords?
Q8. Which keyword was added in Java 1.4?
Q9. Which of the following keywords is reserved in Java but never implemented?
🎉 Great job! Continue learning Java.
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