Boolean in Java

Java Booleans

• YES / NO
• ON / OFF
• TRUE / FALSE

For this, Java has a boolean data type, which can take the values true or false.

1)Boolean Values

A boolean type is declared with the boolean keyword and can only take the values true or false:

public class MyClass

{
public static void main(String[] args)

{
boolean firstvalue = true;
boolean secondvalue = false;
System.out.println(firstvalue);
System.out.println(secondvalue);
}
}

However, it is more common to return boolean values from boolean expressions, for conditional testing (see below).

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2)Boolean Expression

A Boolean expression is a Java expression that returns a Boolean value: true or false.

You can use a comparison operator, such as the greater than (>) operator to find out if an expression (or a variable) is true:

Example

public class MyClass

{
public static void main(String[] args)

{
int x = 10;
int y = 9;
System.out.println(x > y); // returns true, because 10 is higher than 9
}
}

Example

public class MyClass

{
public static void main(String[] args)

{
System.out.println(10 > 9); // returns true, because 10 is higher than 9
}
}

Example

In the examples below, we use the equal to (==) operator to evaluate an expression:

public class MyClass

{
public static void main(String[] args)

{
int x = 10;
System.out.println(x == 10); // returns true, because the value of x is equal to 10
}
}

Example

public class MyClass

{
public static void main(String[] args)

{
System.out.println(15 == 10); // returns false, because 10 is not equal to 15
}
}