package chapter7;

import java.util.function.Supplier;

import java.util.Scanner;

public class Sect2_Ex1

{

public static void main(String[] args)

{

Supplier<Integer> selectOperation = () -> {

int operation = 0;

Scanner userInput = new Scanner(System.in);

while (operation < 1 || operation > 4)

{

System.out.println("Select an operation:");

System.out.println(" 1: Operation 1");

System.out.println(" 2: Operation 2");

System.out.println(" 3: Operation 3");

System.out.println(" 4: Quit");

operation = Integer.parseInt(userInput.nextLine());

if (operation < 1 || operation > 4)

System.out.println("Invalid operation");

}

return operation;

};

boolean done = false;

while (!done)

{

switch (selectOperation.get())

{

case 1: System.out.println("Performing Operation 1");

break;

case 2: System.out.println("Performing Operation 2");

break;

case 3: System.out.println("Performing Operation 3");

break;

default: done = true;

}

}

}

}