How to Go Back to Begining of Program in Java

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Loop back to the beginning of the program

Posted 27 October 2011 - 02:28 PM

I have a program almost completely finished, but I need the program to loop back to the beginning. Here is the code:

import java.util.Scanner;  public class Tasks { 	public static void main(String[] args) 	{ 		Scanner input = new Scanner(System.in);  		String entry;  		System.out.println("Please select one of the choices: "); 		System.out.println("Enter 1 for string functions."); 		System.out.println("Enter 2 for simple arithmetic functions."); 		System.out.println("Enter 3 for temperature conversion."); 		System.out.println("Enter 4 for sequences."); 		System.out.println("Enter 5 to exit."); 		entry = input.nextLine();  		while (!entry.equals("1") && entry.equals("2") && entry.equals("3") 				&& entry.equals("4") && entry.equals("5")) 		{ 			System.out 					.println("Invalid entry. Please enter a number 1 through 5."); // Checks 																					// to 																					// make 																					// sure 																					// user 																					// entry 																					// is 																					// valid 			entry = input.nextLine(); 		}  		if (entry.equals("1")) 		{ 			stringFunctions(); 		}  		else if (entry.equals("2")) 		{ 			arithmeticFunctions(); 		}  		else if (entry.equals("3")) 		{ 			temperatureConversion(); 		}  		else if (entry.equals("4")) 			sequences();  		else 			exit(); 	}  	/* 	 * Method that asks for a phrase, and prints the first word, last word, and 	 * length of the phrase. 	 */ 	private static String stringFunctions() 	{ 		Scanner input = new Scanner(System.in); 		String message, firstWord, lastWord; 		int pos, pos2, length;  		System.out.println("Enter a multiple word phrase: "); 		message = input.nextLine(); 		while (!message.contains(" ")) 		{ 			System.out 					.println("Invalid entry. Please enter a multiple word phrase."); 			message = input.nextLine(); 		}  		pos = message.indexOf(" "); 		firstWord = message.substring(0, pos); 		System.out.println("The first word of the phrase is " + firstWord); 		pos2 = message.lastIndexOf(" "); 		lastWord = message.substring(pos2 + 1); 		System.out.println("The last word of the phrase is " + lastWord); 		length = message.length(); 		System.out.println("The length of the phrase is " + length);  		return message; 	}  	/* 	 * Method that asks the user for two integer values then prints the sum of 	 * the integers, positive difference between the integers, the product of 	 * the integers, the number of times the first is evenly divisible by the 	 * second, the remainder from that division, and the full decimal quotient 	 * when the first number is divided by the second number 	 */ 	private static double arithmeticFunctions() 	{ 		Scanner input = new Scanner(System.in); 		int num1; 		int num2;  		System.out.println("Please enter an integer value: "); 		num1 = input.nextInt(); 		System.out.println("Please enter another integer value: "); 		num2 = input.nextInt(); 		while (num1 == 0 || num2 == 0) 		{ 			System.out 					.println("Invalid entry. Please enter an integer value: "); 			num1 = input.nextInt(); 			System.out.println("Please enter another integer value: "); 			num2 = input.nextInt(); 		} 		System.out.println(num1 + " + " + num2 + " = " + (num1 + num2)); 		if (num1 > num2) 		{ 			System.out.println(num1 + " - " + num2 + " = " + (num1 - num2)); 		}  		if (num2 > num1) 		{ 			System.out.println(num1 + " - " + num2 + " = " + (-(num1 - num2))); 		}  		System.out.println(num1 + " * " + num2 + " = " + (num1 * num2)); 		System.out.println(num1 + " / " + num2 + " = " + (num1 / num2) 				+ " remainder " + (num1 % num2)); 		System.out 				.println(num1 + " / " + num2 + " = " + ((double) num1 / num2)); 		return num1; 	}  	/* 	 * Method that converts fahrenheit to celsius and celsius to fahrenheit. 	 */ 	public static int temperatureConversion() 	{ 		Scanner input = new Scanner(System.in); 		int entry1, entry2, fahrenheit, celsius;  		System.out.println("Please enter a fahrenheit temperature: "); 		entry1 = input.nextInt(); 		celsius = (entry1 - 32) * 5 / 9; 		System.out.println(entry1 + " degrees fahrenheit is " + celsius 				+ " degrees celsius.");  		System.out.println("Please enter a celsius temperature: "); 		entry2 = input.nextInt(); 		fahrenheit = entry2 * 9 / 5 + 32; 		System.out.println(entry2 + " degrees celsius is " + fahrenheit 				+ " degrees fahrenheit.");  		return fahrenheit; 	}  	/* 	 * Method that prints an arithmetic sequence that the user picks. From 	 * there, if the user enters the correct answer for the sequence, method 	 * prints correct. Otherwise it prints incorrect and the correct answer. 	 */ 	public static int sequences() 	{ 		Scanner input = new Scanner(System.in); 		int entry, ans1, ans2, ans3, ans4, ans5;  		System.out.println("Please enter an integer number 1 through 5"); 		entry = input.nextInt(); 		if (entry == 1) 		{ 			System.out 					.println("4, 10, 16, 22, 28. What is the next element of the sequence?"); 			ans1 = input.nextInt(); 			if (ans1 != 34) 				System.out 						.println("Incorrect answer. The correct answer is 34"); 			else 				System.out.println("Correct."); 		}  		else if (entry == 2) 		{ 			System.out 					.println("10, 9, 8, 7. What is the next element of the sequence?"); 			ans2 = input.nextInt(); 			if (ans2 != 6) 				System.out 						.println("Incorrect answer. The correct answer is 6."); 			else 				System.out.println("Correct."); 		}  		else if (entry == 3) 		{ 			System.out 					.println("4, 10, 17, 25, 34. What is the next element of the sequence?"); 			ans3 = input.nextInt(); 			if (ans3 != 44) 				System.out 						.println("Incorrect answer. The correct answer is 44."); 			else 				System.out.println("Correct."); 		}  		else if (entry == 4) 		{ 			System.out 					.println("34, 30, 25, 19. What is the next element of the sequence?"); 			ans4 = input.nextInt(); 			if (ans4 != 12) 				System.out 						.println("Incorrect answer. The correct answer is 12."); 			else 				System.out.println("Correct."); 		}  		else 		{ 			System.out 					.println("0, 1, 1, 2, 3. What is the next element of the sequence?"); 			ans5 = input.nextInt(); 			if (ans5 != 5) 				System.out 						.println("Incorrect answer. The correct answer is 5."); 			else 				System.out.println("Correct."); 		}  		return entry;  	}  	/* 	 * Method that prompts the user goodbye. 	 */ 	private static void exit() 	{ 		System.out.println("Thank you for using my program! Goodbye!"); 	} }            

I feel like there is some line of code that should make it go back to the main method but I'm not sure. Any help is much appreciated.

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#2 tkess17

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Re: Loop back to the beginning of the program

Posted 27 October 2011 - 02:37 PM

Ah I figured it out. I just had to add main(null); at the end of each method.

How to Go Back to Begining of Program in Java

Source: https://www.dreamincode.net/forums/topic/253171-loop-back-to-the-beginning-of-the-program/

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