Thread: Need looping help for my GUI.

This is my code:

import java.awt.*;
import java.awt.event.*;
import java.text.DecimalFormat;
import javax.swing.*;
 
 
public class Stapler extends Ink{
 
 
        String[] name = {"Stapler", "Pens", "Paper","Staples"};
		int[] numberItem = {123456, 654321, 987654,963147};
		int[] inStock = {123, 321, 987,721};
		double[] price = {4.75, 2.50, 1.37,1.36};
               double[] tut = {inStock[0] * price[0] * restockFee + inStock[0] * price[0], inStock[1] * price[1] * restockFee + inStock[1] * price[1], 
                   inStock[2] * price[2] * restockFee + inStock[2] * price[2],inStock[3] * price[3] * restockFee + inStock[3] * price[3] };
               double every = (price[2]*inStock[2]+price[1]*inStock[1]+price[0]*inStock[0] * restockFee + 
			price[2]*inStock[2]+price[1]*inStock[1]+price[0]*inStock[0] * stockfee + inStock[3] * price[3] * restockFee + inStock[3] * price[3] );
 
private Stapler bob;
 
 
	public String getnaM(){
		return(sub);
		 }       
 
		public int getiN(){
			return(numb);
		 }         
 
 
			public double geteach(){
				return(pricE);
		 }    
 
public int getstocks(){
	return(iNs);
		 }
 
	public double getaL(){
		return(vaL);
		 }    
 
		public double getFee(){
			return(stockfee);}
 
 
			public String[] getnames(){
			return(name);
			}
				public int[] getItemnumber(){
				return(numberItem);
				}
					public double[] getprices(){
					return(price);
					}
						public int[] getunits(){
						return(inStock);
						}	
 
							public double[] getVolume() {
							return (tut);
							}
 
			public double getEverything(){
			return(every);}
 
	Stapler(){
 
 
		}
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
     	final Stapler stapler;
 
			stapler = new Stapler();
 
			final DecimalFormat f = new DecimalFormat("$0.00");
 
 
 
  final int[] be = {0,1,2,3};
 
 
JPanel p = new JPanel();
 
JFrame myFrame = new JFrame("Inventory Program");  
 
		myFrame.setSize(295, 175);// width, height
 
 myFrame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);  
 
 myFrame.setVisible(true); 
 
 
 
 
 
 
 final JTextArea out = new JTextArea();
 out.setEditable(false);
 
 JButton btnFirst = new JButton("First");
 btnFirst.setActionCommand("First");
 
  JButton btnLast = new JButton("last");
 btnLast.setActionCommand("last");
 
  JButton btnNext = new JButton("Next");
 btnNext.setActionCommand("Next");
 
   JButton btnPrevious = new JButton("Prev");
 btnPrevious.setActionCommand("Prev");
 
 
btnFirst.addActionListener(new ActionListener() {
 
            @Override
            public void actionPerformed(ActionEvent e) {
 
out.setText("");
out.append("Product name: "+stapler.getnames()[0]);
out.append("\nProduct number: "+stapler.getItemnumber()[0]);
out.append("\nPrice of one product: "+f.format(+stapler.getprices()[0]));
out.append("\nNumber of units in stock: "+stapler.getunits()[0]);
out.append("\nTotal value of product in stock: "+f.format(+stapler.getVolume()[0]));
 
            }
        });
 
 
 
 
 
    btnPrevious.addActionListener(new ActionListener() {
            private int b;
 
            @Override
            public void actionPerformed(ActionEvent e) {
        if(b>0)       {
            --b;
out.setText("");
out.append("Product name: "+stapler.getnames()[b]);
out.append("\nProduct number: "+stapler.getItemnumber()[b]);
out.append("\nPrice of one product: "+f.format(+stapler.getprices()[b]));
out.append("\nNumber of units in stock: "+stapler.getunits()[b]);
out.append("\nTotal value of product in stock: "+f.format(+stapler.getVolume()[b]));
        }else{out.setText("");
out.append("Product name: "+stapler.getnames()[2]);
out.append("\nProduct number: "+stapler.getItemnumber()[2]);
out.append("\nPrice of one product: "+f.format(+stapler.getprices()[2]));
out.append("\nNumber of units in stock: "+stapler.getunits()[2]);
out.append("\nTotal value of product in stock: "+f.format(+stapler.getVolume()[2]));}
            }
        });  
      btnNext.addActionListener(new ActionListener() {
            private int i;
 
 
            @Override
 
            public void actionPerformed(ActionEvent e) {
       if(i < be.length -1)    {   
           i++; 
out.setText("");
out.append("Product name: "+stapler.getnames()[i]);
out.append("\nProduct number: "+stapler.getItemnumber()[i]);
out.append("\nPrice of one product: "+f.format(+stapler.getprices()[i]));
out.append("\nNumber of units in stock: "+stapler.getunits()[i]);
out.append("\nTotal value of product in stock: "+f.format(+stapler.getVolume()[i]));
           }else{
   out.setText("");
out.append("Product name: "+stapler.getnames()[0]);
out.append("\nProduct number: "+stapler.getItemnumber()[0]);
out.append("\nPrice of one product: "+f.format(+stapler.getprices()[0]));
out.append("\nNumber of units in stock: "+stapler.getunits()[0]);
out.append("\nTotal value of product in stock: "+f.format(+stapler.getVolume()[0]));    
}
          }
        });
 
 
    btnLast.addActionListener(new ActionListener() {
 
            @Override
            public void actionPerformed(ActionEvent e) {
 
out.setText("");
out.append("Product name: "+stapler.getnames()[2]);
out.append("\nProduct number: "+stapler.getItemnumber()[2]);
out.append("\nPrice of one product: "+f.format(+stapler.getprices()[2]));
out.append("\nNumber of units in stock: "+stapler.getunits()[2]);
out.append("\nTotal value of product in stock: "+f.format(+stapler.getVolume()[2]));
 
            }
        });
 p.add(out);
 myFrame.add(p);
 p.add(btnFirst);
 p.add(btnPrevious);
 p.add(btnLast);
 p.add(btnNext);
 
 
 
 btnFirst.setLayout(new BorderLayout());
 p.add(btnFirst, BorderLayout.SOUTH);
 
 btnPrevious.setLayout(new BorderLayout());
 p.add(btnPrevious, BorderLayout.SOUTH);
 
  btnNext.setLayout(new BorderLayout());
 p.add(btnNext, BorderLayout.SOUTH);
 
 btnLast.setLayout(new BorderLayout());
 p.add(btnLast, BorderLayout.SOUTH);
}
 
  }

My problem is i cannot get my next button to continure to loop around. After the else statment is true it is stuck on the else until the program is restarted. Also i need help with my previous button logic. The previous button goes straight to the last array of information. How do i get my next button to work compltly and how do i fix my previous button to work. Thank you.

ink:

public class Ink {
 
String sub = ("Staples"); 
	int numb = (963147);
		double pricE = (1.36);
int iNs = (721);
	double restockFee = (.05);
		double vaL = (iNs * pricE);
double stockfee = (vaL * restockFee + vaL);
 
}

sorry about the bad formatting im still learning that. Also i know it doesnt compile i have class ink. If you are trying to get it to run i can post that code to. And the previous button should be exactly like the next button. It should go backwords from whhatever information you are seeing all the way without stoping and the next button should do the same but go forwards.
ps i posted the ink file.

I dont know how to do that. i know how to add a println statment but thats it. How do i make one tell me whats wrong?

O ok. so the println should be inside the if statment to see if its doing what i need it to? if i get the println statment to work correclty i can just implement that into the gui code? That seems reletivly easy but will this always work?

can i get a short example to fully understand what you mean. I do understand but having trouble seeing how to implement this into my own code to use println as a debugger.

Thank you. veriable b is not changing value and i dont know why. It is equal to my array[0]. I guess my logic is wrong. My next button seems to stop at my last array but how do i get an infinite loop to go around my arrays using the next button.
Also would that logic be similar with the previous button just opposite?

Ok to do all of that i need to figure out how to get the code to know what loops its at right? ok lets get some pseudocode:
if currentArray[] +1
output
else at end of array start at 0.

so how do i get the code to relize what array its on?

their are 4 array's. The reason i ask is when i use the next button it doesnt matter which array im on it goes from the second integer to the first one then stops. That is hwy im asking.

This is the code from beggining to end were it stops. After the last output it repeats that same output. What it should do after it reaches that last variable is go to the first one and repeat the code over and over until i shut the program down.

Product name: Pens
 
Product number: 654321
 
Price of one product: $2.50
 
Number of units in stock: 321
 
Total value of product in stock: $842.62
Product name: Paper
 
Product number: 987654
 
Price of one product: $1.37
 
Number of units in stock: 987
 
Total value of product in stock: $1419.80
Product name: Staples
 
Product number: 963147
 
Price of one product: $1.36
 
Number of units in stock: 721
 
Total value of product in stock: $1029.59

I fixed my next button with adding a i=0 to restart form the beggining when the else is activated.
but now i cannot get my previous button else to activate when it reaches 0 it throws an error saying willnot go -1. How do i get the else to trigger when going in revers.

When the next reaches the end of the array the else is triggered but when the previous button reaches the beginning it does not trigger the else statment.
and yes my println statments outcome for next is correct but not for the previous button now.

it shows 3,2,1,0 so its going thru all of them but then it throws an error of -1. like this:

Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: -1

Thats what i tried to do with the else statment but the else will not trigger for that to happen.

        btnPrevious.addActionListener(new ActionListener() {
            private int b = 4;
 
            @Override
            public void actionPerformed(ActionEvent e) {
 
 
                if (b < be.length  +1) {
                    b--;
                    out.setText("");
                    out.append("Product name: " + stapler.getnames()[b]);
                    out.append("\nProduct number: " + stapler.getItemnumber()[b]);
                    out.append("\nPrice of one product: " + f.format(+stapler.getprices()[b]));
                    out.append("\nNumber of units in stock: " + stapler.getunits()[b]);
                    out.append("\nTotal value of product in stock: " + f.format(+stapler.getVolume()[b]));
                    System.out.println("Test number is " + stapler.getbe()[b]);
 
                } else {
                    b = 4;
 
 
                    out.setText("");
                    out.append("Product name: " + stapler.getnames()[b]);
                    out.append("\nProduct number: " + stapler.getItemnumber()[b]);
                    out.append("\nPrice of one product: " + f.format(+stapler.getprices()[b]));
                    out.append("\nNumber of units in stock: " + stapler.getunits()[b]);
                    out.append("\nTotal value of product in stock: " + f.format(+stapler.getVolume()[b]));
                    System.out.println("Else triggered ");
                }
            }
        });

This is the section of code. The else statment is never reached is their a mistake in my code. If not how can i tell the if statment to go to else when 0 is reached?

I understand that but that is what im having trouble with. I cannot find the correct logic for the loop i know im close but cannot find the one i need. The logic i have right now is working only halfway. The only thing i need it to do now is go back to the 3rd array when it reaches array 0. If i cna do that i will have no problems. But i have no clue on how to do so and have tried everything i can think of.