menu.java

import java.util.Scanner;
public class menu {

	public void printheader() {
		//Prints first menu display
		System.out.println("|-------------------------------------|");
		System.out.println("|            Welcome To My            |");
		System.out.println("|           Menu Application          |");
		System.out.println("|-------------------------------------|");
		System.out.println();
		System.out.print("Please press the ENTER key to navigate through the program unless instructed otherwise!");
	}

	public void printoptions() {
		//Prints available menu options
		int a;
		menu menu = new menu();

		do {
			//Do-While loop for repeated return to the option menu
			System.out.println("1. Use option 1 to determine the accuracy of option 2 & 3.");
			System.out.println();
			System.out.println("2. Use option 2 to solve a quadratic equation.");
			System.out.println();
			System.out.println("3. Use option 3 to solve a linear equation.");
			System.out.println();
			System.out.println("3. Use option 4 to bubble sort your student ID number.");
			System.out.println();
			System.out.println("4. Use option 5 to convert seconds into hours, minutes, seconds.");
			System.out.println();
			System.out.println("5. Use option 6 to exit the program.");

			Scanner input = new Scanner(System.in);
			//User to input their option choice
			System.out.println();
			System.out.print("Please choose an option: ");
			a = input.nextInt();
			System.out.println();

			optionMethods function = new optionMethods();
			switch(a) {
			//Switch to call different methods depending on user option input

			case 1:
				System.out.println("You have picked option 1.");
				System.out.println();
				function.accuracy();
				break;

			case 2:
				System.out.println("You have picked option 2.");
				System.out.println();
				function.equation();
				break;

			case 3:
				System.out.println("You have picked option 3.");
				System.out.println();
				function.linerEquation();
				break;

			case 4:
				System.out.println("You have picked option 4.");
				System.out.println();
				function.bubblesort();
				break;

			case 5:
				System.out.println("You have picked option 5.");
				System.out.println();
				function.seconds();
				break;

			case 6:
				function.exit();
				break;

			default:
				//Error message when user inputs invalid option choice
				System.out.println("ERROR - This is not a valid entry, please use the navigation to try again.");
				menu.showNextStep();
				menu.printoptions();
			}
			System.out.println();
			System.out.println("Please use the navigation to return to the menu");
			menu.showNextStep();
			//instructions on how to return to option menu

		} while(a < 6);
		//Close of loop with condition
	}

	public void showNextStep() {
		// Method used to navigate to next section using the ENTER key

		Scanner input = new Scanner(System.in);
		Boolean validNavigation = false;
		//declaring boolean to be used to create condition for do-while loop

		do {
			String space = input.nextLine();
			String answer = " ";
			if(0 < space.length()) {
				System.out.println();
				System.out.println("ERROR - You need to use the ENTER Key for navigation, please try again.");
				validNavigation = false;
				//Using if statement to set condition for error message to executed
			}
			else
				validNavigation = true;
			//Changing value of boolean to terminate loop
		} while(!validNavigation);
	}
}