Output problem urgent!!

Question

Okay so heres the problem i have a piece of code to convert a decimal value that a user enters into a binary value. My algorithm works its just when the binary value is displayed only the last element of the binary value to be outputed is displayed. But i want all the values of the binary number to be displayed. I dont know what to do plz help.
the code i am using is:
import java.awt.*;
import java.awt.event.*;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import javax.swing.*;
public class conversion extends JPanel implements ActionListener
     JPanel board;                // Panel for buttons
     JLabel canvas;               // Text Area for displaying answer
    JButton convert, reset;  // buttons
       JTextField input;       //input text box
         public conversion()
             super(true); // Call constructor of parent
          // Standard layout (flow)
             setLayout(new FlowLayout());
          // Set up two panels, control board and canvas
             board = new JPanel(true);
          canvas = new JLabel();
             board.setPreferredSize(new Dimension(100, 100));
             canvas.setPreferredSize(new Dimension(300, 300));
          board.setBorder(BorderFactory.createLineBorder(Color.black));
          canvas.setBorder(BorderFactory.createLineBorder(Color.blue));
          // Create buttons and attach listeners
             convert = new JButton("Convert");
             convert.addActionListener(this);
             reset = new JButton("Reset");
             reset.addActionListener(this);
          input = new JTextField(8);
             add(canvas); add(board);
          // Add button to board panel
        board.add(convert);
          board.add(input);
          board.add(reset);
     public void actionPerformed(ActionEvent e)
          String inputInfo;
          inputInfo = input.getText();
          if (e.getSource() == convert){           //action on convert button
           //algorithm for decimal to binary conversion
          int a = Integer.parseInt(inputInfo);    //Gets decimal number inputed
          if (a > 255){
               canvas.setText("Please enter a number below 256");
          else {
          int b[] = new int[50];
          int i = 0;
          if (a / 2!=0 || a==1)               //Checks to see if decimal number is divisible by 2
          {                                             //Or exactly equal to 1
          while(a!= 1)                            //While loop for when the decimal inputted is not equal to 1
          b= a % 2;                              
          a = a / 2;                                   //Check to see if the remainder is divisible by 2
          i++;
          b[i]= 1;
          for(int x=i;x>=0;x--)
                                                  //Displays the binary answer
               int answer = b[x];
               String stringAns = Integer.toString(b[x]);     
               System.out.println(stringAns);
               canvas.setText ("The binary for your decimal is: " + stringAns); // this is the problem here, only the last element is displayed
          if (e.getSource() == reset){           //action on reset button
               canvas.setText("");     
               input.setText("");
          //Graphics g = canvas.getGraphics();}
     public static void main(String[] args)
     // Create a Blob entity
     conversion b = new conversion();
          // Set up outer frame, and its exit behaviour
     JFrame frame = new JFrame("Decimal to binary");
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          // Set the main content frame to be the Blob,
          // size the frame (pack) and make it visible
     frame.setContentPane(b);
     frame.pack();
     frame.setVisible(true);

Answer 1

pauze wrote:
          for(int x=i;x>=0;x--)
                                                  //Displays the binary answer
               int answer = b[x];
               String stringAns = Integer.toString(b[x]);     
               System.out.println(stringAns);
               canvas.setText ("The binary for your decimal is: " + stringAns);        // this is the problem here, only the last element is displayed
Each element in the array b contains one digit of the binary representation. You need to convert each digit into a character and then concatenate all the characters into a String before displaying anything.