the program prints out 25. That’s all you really need to know about the java.util.function.Function interface. It is a very simple component that simply requires the implementation of one method — ...

A simple Java program that uses Swing and Java2D to help students understand the concept of Java interfaces. The program is a JFrame that contains shapes. Created shapes can be dragged around the top ...

In this functional programming tutorial, we will work through a Java Supplier interface example. Java’s functional supplier interface can be used any time a function needs to generate a result without ...

A Simple Calculator Program which can perform basic addition ... It gets notified against ActionEvent. ActionListener - an interface is found in java.awt.event package. The actionPerformed() method ...