Boolean Datatype Example in Java

Introduction

Boolean Datatype is a classic Java console program that demonstrates the concept with complete source code and sample output. Java primitive types and wrappers behave differently from objects — these examples show declaration, range and conversion.

This tutorial walks through the program line by line, explains how the logic works, and highlights best practices you can apply in your own code.

Definition

The boolean data type has only two possible values: true and false. Use this data type for simple flags that track true/false conditions. This data type represents one bit of information.

Syntax

boolean varibale_name = true/false;

Syntax Example

boolean gear = true;

Boolean Datatype Example Program

class BooleanDatatype{
	public static void main(String[] args){
		boolean b=(10>9)?true:false;
		System.out.println("10>9 is "+b);
	}
}

Sample Output

10>9 is true

When to use

Use this boolean datatype example when learning or revising core Java syntax.

How it works

1. Execution begins in the main method — the JVM calls this method when you run the class.

2. boolean b=(10>9)?true:false; updates a variable used in the calculation or output.

3. A println / print call writes text to the console — part of the sample output below.

4. Compare your console output with the sample output for Boolean Datatype to confirm the program behaves correctly.

Best Practices

• Use meaningful variable and class names that describe their purpose.
• Compile and run the program locally — modify values to see how output changes.
• Read compiler errors carefully; they usually point to the exact line to fix.

Common Mistakes

• Copying code without understanding each line — practice by changing one statement at a time.
• Mismatching the public class name and the .java filename.
• Forgetting semicolons at the end of statements.