Java Exercises
2 min read ·
This section focuses on writing correct and runnable Java code. Every example shown here follows proper Java syntax and can run without errors.
Challenge One Print the Sum
The code below correctly calculates the sum and prints the result. It includes the required class and main method.
When this program runs, the output will be:
Note
In Java, code will not run unless it is inside a class and the main method.
Challenge Two Print a Message
This challenge checks if you understand basic syntax and statements.
This program prints a simple message to the screen.
Challenge Three Using Variables
This example shows proper variable declaration, assignment, and output.
All statements are written correctly and end with semicolons.
Challenge Four Multiple Statements
This challenge tests writing multiple valid Java statements together.
Java executes these statements from top to bottom.
Common Syntax Rules to Remember
Every Java program must have a class
Execution starts from the main method
Every statement ends with a semicolon
Code blocks must use curly braces
Caution
Writing only one or two lines without a class and main method will cause compilation errors.
Why These Challenges Matter
These challenges help you build the habit of writing:
Complete Java programs
Correct syntax from the start
Error free and executable code
Goal Achieved
You can now identify and write Java code that actually runs without syntax errors.