Error Message in JBuilder

[RavenNevarmore]

Alright, so I'm pretty new here and new to Java, and I'm sitting here working on my homework and I think that I've got the code correct, but I keep getting this error on my program:

Exception in thread "main" java.lang.Error: Unresolved compilation problems:

The Program itself looks like this:

Code:

import javax.swing.JOptionPane;
public class study2 {

	public static void main(String[] args) {
		String temp1 , temp2;
		int num1 , num2, max = 0;
		String choice="";
			
		do{
			JOptionPane.showInputDialog("The First Number is:");
				num1 = Integer.parseInt(temp1);
			JOptionPane.showInputDialog("The Second Number is:");
				num2 = Integer.parseInt(temp2);
			
				if (num1 > num2)
					max = num1;
				else max = num2;
				
			JOptionPane.showMessageDialog(null,"The Maximum is" +max);
			JOptionPane.showInputDialog(null, "Would you like to continue?: ");
					
				} while (choice.equals("yes")||choice.equals("Yes"));
			 
			 
		}
		
		

	}

I would immensely appreciate any help on this error, or how to fix whatever I did wrong.

[Eranga]

Are you sure that your code is correct. I don't think so.

You have declared two String variables temp1 and temp2. You use them inside the main method without initialization. That's why you get compilation error in your code.

[RavenNevarmore]

Then how do I 'initilize' these variables? I thought that all I had to do to use a variable was to declare it.

[Eranga]

If you are using local variables, you must declare them before use. For instance/class variables you don't need to do it, default values are automatically declared.

Code:

			temp1 = JOptionPane.showInputDialog("The First Number is:");
				num1 = Integer.parseInt(temp1);
			temp2 = JOptionPane.showInputDialog("The Second Number is:");
				num2 = Integer.parseInt(temp2);

[Eranga]

Here is much better code segment. Write it just for fun. Try to learn something on that pal, but I'm not superior on Java.

Code:

import javax.swing.JOptionPane;

public class study2 {

    public static void main(String[] args) {
        String temp1 = null , temp2 = null;
        int num1 = 0 , num2 = 0, max = 0;
        int ret = 0;
        
        inner: do {
            try {
                temp1 = JOptionPane.showInputDialog("The First Number is:");
                num1 = Integer.parseInt(temp1);

                temp2 = JOptionPane.showInputDialog("The Second Number is:");
                num2 = Integer.parseInt(temp2);
            }
            catch(NumberFormatException ex) {
                JOptionPane.showMessageDialog(null, "Invalid input");
                continue inner;
            }
            if (num1 > num2)
                max = num1;
            else 
                max = num2;

            JOptionPane.showMessageDialog(null,"The Maximum is " +max);
            ret = JOptionPane.showConfirmDialog(null, "Continue?", "More", 
                    JOptionPane.YES_NO_OPTION , JOptionPane.INFORMATION_MESSAGE);

        } while(ret == JOptionPane.YES_OPTION);
    }

}