I have error in the top of this program not sure what I did wrong.

import javax.swing.JOptionPane;

public class Main_Class {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        class wk2 {

            private static final char Y = 0;

            /**
             * @param args
             */
            public void main(String[] args) {
                // declare variables
                int input1, input2, sum, diff, product, average, absolute, max, min, adjusted1, adjusted2, newSum;

                // welcome message
                JOptionPane.showMessageDialog(null, "By xxx, " +
                    "Class CIS247B.\nThis program asks for two intergers, calculates and display their sum, difference, product and average.\n" +
                    "Press OK to begin, follow prompts...\n", "NumberGames",JOptionPane.INFORMATION_MESSAGE);

                do {
                // get input
                String number1 = JOptionPane.showInputDialog(null,"Enter first integer","Input for Calculations",
                        JOptionPane.QUESTION_MESSAGE); // get first integer
                input1 = Integer.parseInt(number1); // convert first integer from string to integer type
                String number2 = JOptionPane.showInputDialog(null,"Enter second integer","Input for Calculations",
                        JOptionPane.QUESTION_MESSAGE); // get second integer
                input2 = Integer.parseInt(number2); // convert second integer from string to integer type
                // do calculations
                sum = input1 + input2; // add integers and initialize sum
                diff = input1 - input2; // subtract integers and initialize diff (for difference)
                product = input1 * input2; // multiply integers and initialize product
                average = sum / 2;
                absolute = (diff < 0) ?  -diff : diff;
                max = (input1 > input2) ? input1 : input2;
                min = (input1 < input2) ? input1 : input2;

                // display results
                String output = "The two integers you entered are " + number1 +" and " + number2 + ".\n" +
                    "Their sum is " + sum + " ("+ number1 + "+" + number2 + "=" + sum + ").\n" +
                    "Their difference is " + diff + " ("+ number1 + "-" + number2 + "=" + diff + ").\n" +
                    "Their product is " + product + " ("+ number1 + "x" + number2 + "=" + product + ").\n" +
                    "Their average is " + average + " ("+ sum + " divided by 2 = " + average + ").\n" +
                    "The absolute value of their difference is " + absolute + ".\n" +
                    "The maximum number is " + max + ".\n" +
                    "The minimum number is " + min + "." ;
                JOptionPane.showMessageDialog(null, output, "Output",JOptionPane.INFORMATION_MESSAGE);  

                // if both numbers are greater than 100, then subtract 100 from each.
                if (input1 > 100 && input2 > 100) {
                    adjusted1 = input1 - 100;
                    adjusted2 = input2 - 100;
                    String output2 = "Both interger values are greater than 100, therefore their values have been adjusted as follows:\n" +
                        "The first integer's value is now " + adjusted1 + ". ("+ input1 + " - 100).\n" + 
                        "The second integer's value is now " + adjusted2 + ". ("+ input2 + " - 100)."; 
                    JOptionPane.showMessageDialog(null, output2, "Output",JOptionPane.INFORMATION_MESSAGE); 
                }   
                // if both numbers are negative, then add 200 to their sum.     
                if (input1 < 0 && input2 < 0) {
                    newSum = sum + 200;
                    String output2 = "Both interger values are negative, therefore their sum has been adjusted as follows:\n" +
                        "200 has been added to the sum of both integers. (" + input1 + " + " + input2 +" + 200 = " + newSum + ")"; 
                    JOptionPane.showMessageDialog(null, output2, "Output",JOptionPane.INFORMATION_MESSAGE);         
                }
                System.out.println("continue loop");
                } while ( JOptionPane.showConfirmDialog(null, "Do it again?") == JOptionPane.YES_OPTION);

                String output3 = "Thank you for using my program.";
                JOptionPane.showMessageDialog(null, output3, "Output",JOptionPane.INFORMATION_MESSAGE); 
            }
        }



    }

}

Edited 3 Years Ago by Dani: Formatting fixed

I have error in the top of this program not sure what I did wrong.

import javax.swing.JOptionPane;

public class Main_Class {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		class wk2 {

			private static final char Y = 0;

			/**
			 * @param args
			 */
			public void main(String[] args) {
				// declare variables
				int input1, input2, sum, diff, product, average, absolute, max, min, adjusted1, adjusted2, newSum;
				
				// welcome message
				JOptionPane.showMessageDialog(null, "By xxx, " +
					"Class CIS247B.\nThis program asks for two intergers, calculates and display their sum, difference, product and average.\n" +
					"Press OK to begin, follow prompts...\n", "NumberGames",JOptionPane.INFORMATION_MESSAGE);

				do {
				// get input
				String number1 = JOptionPane.showInputDialog(null,"Enter first integer","Input for Calculations",
						JOptionPane.QUESTION_MESSAGE); // get first integer
				input1 = Integer.parseInt(number1); // convert first integer from string to integer type
				String number2 = JOptionPane.showInputDialog(null,"Enter second integer","Input for Calculations",
						JOptionPane.QUESTION_MESSAGE); // get second integer
				input2 = Integer.parseInt(number2); // convert second integer from string to integer type
				// do calculations
				sum = input1 + input2; // add integers and initialize sum
				diff = input1 - input2; // subtract integers and initialize diff (for difference)
				product = input1 * input2; // multiply integers and initialize product
				average = sum / 2;
				absolute = (diff < 0) ?  -diff : diff;
				max = (input1 > input2) ? input1 : input2;
				min = (input1 < input2) ? input1 : input2;
				
				// display results
				String output = "The two integers you entered are " + number1 +" and " + number2 + ".\n" +
					"Their sum is " + sum + " ("+ number1 + "+" + number2 + "=" + sum + ").\n" +
					"Their difference is " + diff + " ("+ number1 + "-" + number2 + "=" + diff + ").\n" +
					"Their product is " + product + " ("+ number1 + "x" + number2 + "=" + product + ").\n" +
					"Their average is " + average + " ("+ sum + " divided by 2 = " + average + ").\n" +
					"The absolute value of their difference is " + absolute + ".\n" +
					"The maximum number is " + max + ".\n" +
					"The minimum number is " + min + "." ;
				JOptionPane.showMessageDialog(null, output, "Output",JOptionPane.INFORMATION_MESSAGE);	
						
				// if both numbers are greater than 100, then subtract 100 from each.
				if (input1 > 100 && input2 > 100) {
					adjusted1 = input1 - 100;
					adjusted2 = input2 - 100;
					String output2 = "Both interger values are greater than 100, therefore their values have been adjusted as follows:\n" +
						"The first integer's value is now " + adjusted1 + ". ("+ input1 + " - 100).\n" + 
						"The second integer's value is now " + adjusted2 + ". ("+ input2 + " - 100)."; 
					JOptionPane.showMessageDialog(null, output2, "Output",JOptionPane.INFORMATION_MESSAGE);	
				}	
				// if both numbers are negative, then add 200 to their sum.		
				if (input1 < 0 && input2 < 0) {
					newSum = sum + 200;
					String output2 = "Both interger values are negative, therefore their sum has been adjusted as follows:\n" +
						"200 has been added to the sum of both integers. (" + input1 + " + " + input2 +" + 200 = " + newSum + ")"; 
					JOptionPane.showMessageDialog(null, output2, "Output",JOptionPane.INFORMATION_MESSAGE);			
				}
				System.out.println("continue loop");
				} while ( JOptionPane.showConfirmDialog(null, "Do it again?") == JOptionPane.YES_OPTION);
				
				String output3 = "Thank you for using my program.";
				JOptionPane.showMessageDialog(null, output3, "Output",JOptionPane.INFORMATION_MESSAGE);	
			}
		}
			
			
			
	}

}

It says that class wk2 is never used and private static final char Y = 0 is never read locally and public void main(String[] args) { is never used locally

Hello, charlie81. Well, you have class Main_Class, which has method public static void main(String[] args) (which is an entry point into your program). And in that method you're defining new class with it's own entry point.
In the program can be only one method main.

It says that class wk2 is never used and private static final char Y = 0 is never read locally and public void main(String[] args) { is never used locally

That is because you are using the Eclipse IDE (most likely). Those are not compile errors or exceptions. They are "hints" by the IDE. They each have their own little yellow line, right? It is best to understand the language before you use an IDE

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