Java 8 | BooleanSupplier Interface with Examples

The BooleanSupplier Interface is a part of the java.util.function package which has been introduced since Java 8, to implement functional programming in Java. It represents a function which does not take in any argument but produces a boolean value. The lambda expression assigned to an object of BooleanSupplier type is used to define its getAsBoolean() which eventually applies the given operation on its argument. It is similar to using an object of type Supplier<Boolean>

Functions in BooleanSupplier Interface

The BooleanSupplier interface consists of the only one function:

1. getAsBoolean()

This method does not take in any value but produces a boolean result. Syntax:

boolean getAsBoolean()

Return Value: This method returns a boolean value. Below is the code to illustrate getAsBoolean() method: Program: Java

// Java program to illustrate
// getAsBoolean() method of
// BooleanSupplier Interface

import java.util.function.BooleanSupplier;

public class GFG {
    public static void main(String args[])
    {

        // Create a BooleanSupplier instance
        BooleanSupplier sup = () -> true;

        // Get the boolean value
        // Using getAsBoolean() method
        System.out.println(sup.getAsBoolean());
    }
}