Java Booleans

Booleans in Java are a data type that can only have two values: true or false. They are used in decision-making statements to control the flow of a program.

A Boolean value can be assigned to a variable, passed as a parameter to a method, or returned from a method.

Declaring a Boolean Variable

A Boolean variable can be declared in Java using the boolean keyword followed by the variable name.

The following is an example of how to declare a Boolean variable in Java:

boolean isTrue;

Assigning Values to a Boolean Variable

A Boolean variable can be assigned a value of either true or false, as shown in the following example:

boolean isTrue = true;
boolean isFalse = false;

Using Booleans in Conditional Statements

Booleans can be used in conditional statements to control the flow of a program.

For example, the following code demonstrates how a Boolean value can be used in an if statement:

boolean isTrue = true;

if (isTrue) {
    System.out.println("The value of isTrue is true");
}

In the above example, the if statement checks the value of isTrue.

If the value is true, the code inside the if statement is executed.

Boolean Operators

In Java, there are three Boolean operators: AND ( && ), OR ( || ), and NOT ( ! ).

The AND operator returns true if both operands are true, and false otherwise.

The OR operator returns true if at least one operand is true, and false otherwise.

The NOT operator negates a Boolean value, meaning that if the operand is true, the NOT operator returns false, and if the operand is false, the NOT operator returns true.

boolean isTrue = true;
boolean isFalse = false;

System.out.println(isTrue && isFalse); // false
System.out.println(isTrue || isFalse); // true
System.out.println(!isTrue); // false

Conclusion

Booleans are a useful data type in Java for controlling the flow of a program. They can be declared, assigned values, and used in conditional statements.

In addition, there are three Boolean operators that can be used to perform logical operations on Boolean values.

Understanding how to use Booleans effectively can greatly improve the efficiency and organization of your code.

Java Basics