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 Supplierinterface, 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 repositoryhere.