// Demonstration boolean values.
class BoolDemo {
	public static void main(String args[]) {
		boolean b;
		
		b = false;
		System.out.println("b is " + b);
		b = true;
		System.out.println("b is " + b);
		
		// a boolean value can control the if statement
		if(b) System.out.println("This is executed.");
		
		b = false;
		if(b) System.out.println("This is not executed.");
		
		// outcome of a relational operator is a boolean value
		System.out.println("10 > 9 is " + (10 > 9));
	}
}

Create BoolDemo.java