Thread: In a simple calculator the divison is not working for while loop

I wanted to take the input for operand2 from user. That's is why I wrote the method division.
and I am calling that method before my while loop inside main. So I did not think that I had to initialize the operand2 value before while loop.
If I initialize operand2 then every time the program will execute with the same value. Can anybody please help me.
thanks.

 
package labs1301;
import java.util.Scanner;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax. swing.JOptionPane;
import java.util.Scanner; 
import java.util.Scanner; 
import java.util.Scanner; 
 
import java.util.Scanner; 
public class Java1301lab6 {
 
	    private static String Operand2 = null;
 
		public static void main(String[] args) {
 
	        JFrame frame = new JFrame("My Lab6 Calculator");
 
	        String author = "Khandoker Rahad"; // TASK 1: this requires your attention ***********************
	        JOptionPane.showMessageDialog(frame, "Welcome to " + author + "'s calculator!");
 
	        // Now, let's ask the user to pick an operation among a set (bulk memory) of defined operators
	        String[] operators = {"+", "-", "*", "/"};
 
	        // Selecting an operator *******************************************************************************
	        String chosenOperator = (String) JOptionPane.showInputDialog(frame, 
	                                                                    "Which operation do you want to use?",
	                                                                    "Chosen Operator",
	                                                                    JOptionPane.QUESTION_MESSAGE, 
	                                                                    null, 
	                                                                    operators, 
	                                                                    operators[0]);
	        while (chosenOperator == null) {
	            chosenOperator = (String) JOptionPane.showInputDialog(frame, 
	                                                                    "Please select an operator",
	                                                                    "Chosen Operator",
	                                                                    JOptionPane.QUESTION_MESSAGE, 
	                                                                    null, 
	                                                                    operators, 
	                                                                    operators[0]);    
	        }
 
	        // Selecting operands ***********************************************************************************
	        String Operand1 = (String) JOptionPane.showInputDialog(frame, 
	                                                                    "What's your first operand?",
	                                                                    "Operand 1",
	                                                                    JOptionPane.QUESTION_MESSAGE 
	                                                              );
 
			 Operand2 = (String) JOptionPane.showInputDialog(frame, 
	                                                                    "What's your second operand?",
	                                                                    "Operand 2",
	                                                                    JOptionPane.QUESTION_MESSAGE );
	          float operand1 = Float.valueOf(Operand1);                                           
 
			// float operand2;
 
	        division();
 
			//float operand2 = 5000;
 
			while(operand2==0){
 
					JOptionPane.showMessageDialog(frame, "Enter a valid value " );
 
 
				 operand2 = Float.valueOf(Operand2);
 
 
 
				}
 
 
				//System.out.print("Enter valid value");
				 //operand2 = float.valueOf(Operand2);	
			//}
	        // TASK 2 ************************************************************************************************
	        // Here you should get operand2 in the same fashion as you got operand1 in the first place
 
	        // TASK 3 ************************************************************************************************
	        // Now think of it: if your operator is a division, you should not accept 0 as the second operand
	        // So you have to put in place a while loop (similar to the one about the choice of operator) that keeps
	        // prompting the user to enter a second operand while the user enters 0
 
	        if (chosenOperator.compareTo("/") == 0)
	            JOptionPane.showMessageDialog(frame, "Your result is " + ( operand1 /operand2) + "!");
	        // TASK 4 ************************************************************************************************
	        // Here you need to add the other operators
 
 
	       // System.exit(0);
	    }
 
	    public static void division()
	    {
 
	    	// <-- Note that Java is case sensitive :) 
 
	    	float operand2 = Float.valueOf(Operand2); 
	    	//Scanner sc=new Scanner(System.in); 
 
			// int operand=sc.nextInt();  
			// return operand;
	    } 
 
 
}