Thread: Looping through a while loop with a switch statement

Hello all. I am new to Java and I am have some issues with some code I'm working on. I am having a problem with looping a while loop that contains a switch statement. Here is my code:

package hw4jenningsd;

import javax.swing.*;

public class HW4JenningsD {

public static class mathOps {
private int numOne;
private int numTwo;
private int numThreeOne;
private int numThreeTwo;
private String inputStringOne;
private String inputStringTwo;

public mathOps() {
numOne = 0;
numTwo = 0;
numThreeOne = 0;
numThreeTwo = 0;
} //end constructor

public void input() {
inputStringOne = JOptionPane.showInputDialog(null,"Enter your first "
+ "integer number");
numOne = Integer.parseInt(inputStringOne);
inputStringTwo = JOptionPane.showInputDialog(null,"Enter you second "
+ "integer number");
numTwo = Integer.parseInt(inputStringTwo);
}// end input

public void addition() {
numThreeOne = numOne + numTwo;
numThreeTwo = numOne + numTwo;
}// end addtion

public void subtraction() {
numThreeOne = numOne - numTwo;
numThreeTwo = numTwo - numOne;
}// end subtraction

public void multiplication() {
numThreeOne = numOne * numTwo;
numThreeTwo = numTwo * numOne;
}// end multiplication

public void division() {
numThreeOne = numOne / numTwo;
numThreeTwo = numTwo / numOne;
}// end division

public void modulo() {
numThreeOne = numOne % numTwo;
numThreeTwo = numTwo % numOne;
}// end modulo

public void displayResult() {
JOptionPane.showMessageDialog(null, "The result of your "
+ "calculations are " + numThreeOne + " and " +numThreeTwo+"\n and the two integers "
+ "you entered were "+numOne+ " and " +numTwo+ "\n and the type "
+ "of operation performed was "); //another problem. How can I code into this line the type of math operation was performed?
}// end displayResult

}// end class mathOps

public static void main(String[] args) {
String operationString;
int repeatOperation2;
int operationChoice;
mathOps mathOpsOne = new mathOps();
mathOpsOne.input();

JOptionPane.showMessageDialog(null,"Math operations Menu\nThe "
+ "purpose of this menu is to allow the user "
+ "to choose a\nmath operation to be performed.\n\n"
+ "1. +\n2. -\n3. *\n4. /\n5. %\n6. End the program.");
repeatOperation2 = 1;
operationString = JOptionPane.showInputDialog(null,"Press 1 to add,"
+ " 2 to subtract, 3 to multiply, 4 to divide, 5 for modulo, "
+ "or 6 to end the program");
operationChoice = Integer.parseInt(operationString);

while(repeatOperation2 == 1) {
switch(operationChoice) {
case 1: mathOpsOne.addition();
break;
case 2: mathOpsOne.subtraction();
break;
case 3: mathOpsOne.multiplication();
break;
case 4: mathOpsOne.division();
break;
case 5: mathOpsOne.modulo();
break;
case 6: JOptionPane.showMessageDialog(null,"Thanks for using "
+ "my program.");System.exit(0);
break;
default:JOptionPane.showInputDialog(null,"The selection is not"
+ " acceptable.\n Enter 0 to try again.");
break;
}// end switch operationChoice

mathOpsOne.displayResult();repeatOperation2 = 2;

while(repeatOperation2 == 2){
repeatOperation2 = Integer.parseInt(JOptionPane
.showInputDialog("Do you want to use the same "
+ "integers or a new set of integers" +
"\nPress [0] for new integers or [1] for same integers."));// one more problem. If the user chooses the same integers, how can I code it so that the user does not enter a new set of integers?
if(repeatOperation2 == 0) //this is where my problem is. I want the program to loop back to the math menu.
mathOpsOne.input();
else if(repeatOperation2 == 1){
repeatOperation2 = 1;
}
}

}// end while
JOptionPane.showMessageDialog(null,"Thanks for using "
+ "my program. ");System.exit(0);
}// end main

}// end program


Thanks for any assistance.

Welcome to the Forum! Please read this topic to learn how to post code correctly and other useful tips for newcomers.

Please post your code correctly per the above link. Most won't bother to help someone who has incorrectly posted unformatted code. We also won't spend time figuring out what "some issues" means. Explain what you need help with as explicitly as you can.

if you are trying to make it a menu-driven program(where user has to select from menu) then it is better to use do...while loop ,instead of while..!!! do-while will make the user to use your program in an effective manner .

Thank you for cleaning up your post and describing the help you need so clearly.

By Java's naming conventions, class names should begin with capital letters.

Is using a static nested class your idea, or was it mandated by the assignment?

Have you written a similar program with input/output done through the console? If so, I suggest you model the design of this program after that one. If you haven't written a similar console program, then . . . you should have.

For your questions:

Error 1: Set a String that contains the operation chosen and print it after the " was ". You could set the operation String in the corresponding function method.

Error 2: Use an if() statement to branch the program to the desired operation.

Error 3: Use an if() statement and/or a boolean flag to set the state of the program to repeat or accept new operands.

Note: The highlight tags, [highlight=java]code here[/highlight], do the highlighting while the code tags simply preserve formatting.