In Java, we can implement the functional interface with a lambda expression and pass it to a method, then execute the function after an operation is finished. Here’s how that looks in code: ...

showOptionDialog (). JOptionPane import and methods For example, the following Java class uses JOptionPane’s showInputDialog() method to prompt for user input, and then displays a message back to the ...

See the Java 101 Java interfaces tutorial for a more in-depth introduction to using interfaces in your Java programs, including where and where not to use default, static, and private methods.