Java 8 BooleanSupplier Example

In this blog post, I will be explaining how the Java 8 functional interface BooleanSupplier works. To know more about functional interfaces, you can refer this blog post.

The  BooleanSupplier interface provides a method called getAsBoolean. This method does not accept any arguments. It returns a boolean value. The BooleanSupplier interface is a specialization of the Supplier interface that returns a boolean. To see an example of the Supplier interface, refer to this blog post.

BooleanSupplier example

Consider the following code snippet:

public class BooleanSupplierExample {

public static void main(String[] args) {
BooleanSupplier booleanSupplier = () -> true;
System.out.println("Boolean flag = "+booleanSupplier.getAsBoolean());
}
}

Here, we have implemented the getAsBoolean method using a lambda expression. This simply returns the value true. So when this code is executed, it will print the following output:

Boolean flag = true

You can get the source code for this example along with other code for other Java 8 examples at the Github repository here.