converting to JOptionPane

[ir1_83]

hi, all, ok, i admit, that this is my assignment, but i really can't crack the answer. it requires me to convert the scripts below to a JOptionPane... how can it be possible, thank you in advance for those who are willing to help:

//import javax.swing.JOptionPane;
import java.io.*;

public class Q7
{
  public static void main (String[]args) throws IOException
  {
  	String que,temp;
    int triangle;
    BufferedReader DataMasuk;
    DataMasuk = new BufferedReader (new InputStreamReader (System.in));
    System.out.println ("Key in an integer triangle:");
    //System.out.print("Key in an integer triangle: ");
    triangle = Integer.parseInt(DataMasuk.readLine());

  {

	  for(int x=0; x<triangle; x++)
	    {
		  for(int y=0; y<=x; y++)
		    {
			  System.out.print("*");
			  //temp = "*";
		    }
		   System.out.println(" ");
	    }

  }
}
}

[ir1_83]

anybody???

[sjalle]

Read code carefully and understand it before you finish, mkay ?

import javax.swing.*;

public class Q7 {

  public Q7() {} // empty default constructor

  public void doTriangle() {
    try {
      int triangle = getUsersIntegerEntry();
      printTriangle(triangle);
    }
    catch (Exception ex) {  
      // user cancelled, do nothing
    }
  }
  /**
   * Show input dialog, loops with error dialog until the user
   * gets it right.  If user cancels the parse will throw a
   * nullPointerException that is caught by the exception handler
   * in the doTriangle method
   */
  private int getUsersIntegerEntry() throws Exception {
    while (true) {
      String s = JOptionPane.showInputDialog(null,
                                              "Key in an integer triangle",
                                              new Integer(0)); // could also be null
      try {
        return Integer.parseInt(s);
      }
      catch (NumberFormatException ex) {
        JOptionPane.showMessageDialog(null,
                                      s+" is not an integer",
                                      "Input error",
                                      JOptionPane.ERROR_MESSAGE);
      }
    }
  }
  /**
   * Do triangle output
   */
  private void printTriangle(int triangle) {
    for (int x = 0; x < triangle; x++) {
      for (int y = 0; y <= x; y++) {
        System.out.print("*");
        //temp = "*";
      }
      System.out.println(" ");
    }
  }
  /**
   * Main, just creates a Q7 instance and invokes Q7's
   * only public method.
   */
  public static void main(String[] args) {
    Q7 trallala=new Q7();
    trallala.doTriangle();
  }
}

[ir1_83]

thank you very much for the help, but i need the output in the JOptionPane format too... that's what bothers the most, i don't know how to do it...

[sjalle]

I don't think you can get that output in the 'JOptionPane format', infact I'm not sure
what you mean by that. Do you mean draw the triangle in a panel in a frame ?

[ir1_83]

I don't think you can get that output in the 'JOptionPane format', infact I'm not sure
what you mean by that. Do you mean draw the triangle in a panel in a frame ?

sorry for the cofusion, yes, i need it in a panel

[Zodoz]

Yes it is possible to display the output using a JOptionPane, see this code (converted from old):

import javax.swing.JFrame;
import javax.swing.JOptionPane;

public class Triangle {

	public static void main(String[] args) {
		int triangle;
		triangle = Integer.parseInt(JOptionPane.showInputDialog(null,
				"Ke in an integer triangle",null));
		{
			String display="";
			for(int x = 0; x < triangle; x++) {
				for(int y = 0; y <= x; y++) {
					display+="*";
				}
				display+=" \n";
			}
			JOptionPane.showMessageDialog(new JFrame(),display);
		}
	}
}

I think this is what you want to do.

[ir1_83]

thank zodoz n sjalle, both of you have been much help for me. the program works fine. thank you again

[sjalle]

Ok Zodoz, I wasn't aware of that. However, giving an assignment that requires the
students to do text "graphics" in a GUI isn't what I would call relevant education, but
then I have seen many examples of strange teachings presented by students in this
forum.