Displaying graphical representation of data in hash tables as bar chart?

Question

I want to be able to display results in my hash table as a bar chart i don't know how to do it could someone help me I've looked through tutorials couldn't find any information that actually helped.
In my program it doesnt allow matching the capital and small letters
so for instance if I already have Mike it allows for me to input mike in again so there are 2 Mikes.
I also want to do a simple user interface the tutorial for it is not simple to understand could any one tell me how to create a simple user interface like putting a button into a place wher i want it to be.
im not asking anyone to do it for me i just want people to show me how to do it
thank you
Edited by: Tek_Hedef on Dec 1, 2007 4:30 AM

Answer 1

Thanks for the ideas pal but I did have a go at it but my bit of code is making it crash but i removed it now so here's what I have so far
import java.io.*;
import java.util.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
class StudentDetails extends JFrame implements ActionListener
     private JTextField StudentNameTxt, StudentMarkTxt;
    private JButton DeleteStudentDetailsBtn, DisplayAllStudentsBtn, SearchStudentBtn, FailedStudentsBtn, PassedStudentsBtn, DistinctionStudentsBtn, AddStudentDetailsBtn, ExitBtn;
    private JPanel DisplayStudentDetailsPnl;
    private JLabel StudentNameLbl, StudentMarkLbl;
    private JTextArea DisplayResultsTxt;
    private Hashtable StudentDetailsTbl;
    private String StudentName, StudentMark;
    public static void main(String[] args)
        StudentDetails frame = new StudentDetails();
         frame.setSize(600,600);
        frame.createGUI();
        frame.setVisible(true);
    public void display(JPanel DisplayStudentDetailsPnl)
        Graphics paper = DisplayStudentDetailsPnl.getGraphics();
        paper.setColor(Color.white);
        paper.fillRect(0, 0, 500, 500);
        paper.setColor(new Color((int)(Math.random()*255),(int)(Math.random()*255),(int)(Math.random()*255) ));
    private void createGUI()
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        Container window = getContentPane();
        window.setLayout(new FlowLayout());
        StudentDetailsTbl = new Hashtable();
        StudentNameLbl = new JLabel("Student Name");
        window.add(StudentNameLbl);
        StudentNameTxt = new JTextField(15);
        window.add(StudentNameTxt);
        StudentMarkLbl = new JLabel("Student Mark");
        window.add(StudentMarkLbl);
        StudentMarkTxt = new JTextField(3);
        window.add(StudentMarkTxt);
        AddStudentDetailsBtn = new JButton("Add Student and Mark");
        window.add(AddStudentDetailsBtn);
        AddStudentDetailsBtn.addActionListener(this);
        DeleteStudentDetailsBtn = new JButton("Delete Student");
        window.add(DeleteStudentDetailsBtn);
        DeleteStudentDetailsBtn.addActionListener(this);
        DisplayAllStudentsBtn = new JButton("Display all Students and Marks");
        window.add(DisplayAllStudentsBtn);
        DisplayAllStudentsBtn.addActionListener(this);
        SearchStudentBtn = new JButton("Search Student");
        window.add(SearchStudentBtn);
        SearchStudentBtn.addActionListener(this);
        FailedStudentsBtn = new JButton("Students which Failed");
        window.add(FailedStudentsBtn);
        FailedStudentsBtn.addActionListener(this);
        PassedStudentsBtn = new JButton("Students which Passed");
        window.add(PassedStudentsBtn);
        PassedStudentsBtn.addActionListener(this);
        DistinctionStudentsBtn = new JButton("Students with Distinction");
        window.add(DistinctionStudentsBtn);
        DistinctionStudentsBtn.addActionListener(this);
        ExitBtn = new JButton("Exit");
        window.add(ExitBtn);
        ExitBtn.addActionListener(this);
        DisplayResultsTxt = new JTextArea();
        DisplayResultsTxt.setPreferredSize(new Dimension(200, 200));
        DisplayResultsTxt.setBackground(Color.white);
        window.add(DisplayResultsTxt);
        DisplayResultsTxt.enable(false);
    public void actionPerformed (ActionEvent e)
         if (e.getSource()== AddStudentDetailsBtn)
              StudentName = StudentNameTxt.getText();
               StudentMark = StudentMarkTxt.getText();
              DisplayResultsTxt.setText("");
              StudentDetailsTbl.put(StudentName, StudentMark);
            Enumeration enumStudentName = StudentDetailsTbl.keys();
            Enumeration enumStudentMark = StudentDetailsTbl.elements();
            String[] keys = (String[]) StudentDetailsTbl.keySet().toArray(new String[0]);       
            Arrays.sort(keys); 
                for (String key : keys)
                     DisplayResultsTxt.append(key + " : " + StudentDetailsTbl.get(key)+ "\n");
                StudentNameTxt.setText("");
                StudentMarkTxt.setText("");
         if (e.getSource() == DeleteStudentDetailsBtn )
         if (StudentDetailsTbl.containsKey(StudentNameTxt.getText().trim()))
              DisplayResultsTxt.setText("");     
              String txt = StudentNameTxt.getText();
            Enumeration enumStudentName = StudentDetailsTbl.keys()  ;                   
                String currentelement = (String)enumStudentName.nextElement();
                 StudentDetailsTbl.remove(txt);
                 DisplayResultsTxt.append(txt + " has been deleted");  
        if (e.getSource() == SearchStudentBtn)
        if (StudentDetailsTbl.containsKey(StudentNameTxt.getText().trim()))
             String txt = StudentNameTxt.getText();
             String result;
             DisplayResultsTxt.setText("");
             Enumeration enumStudentName = StudentDetailsTbl.keys();
            Enumeration enumStudentMark = StudentDetailsTbl.elements();
               while (enumStudentName.hasMoreElements())
                    String currentelement = (String)enumStudentName.nextElement();
                result = (StudentDetailsTbl.get(currentelement).toString());
                    if (txt.equals(currentelement))
                         DisplayResultsTxt.append(currentelement + " " + result);
                    else JOptionPane.showMessageDialog(null, "Student Name could not be identified");
        if (e.getSource() == DisplayAllStudentsBtn)
              DisplayResultsTxt.setText("");
             Enumeration enumStudentName = StudentDetailsTbl.keys();
            Enumeration enumStudentMark = StudentDetailsTbl.elements();
            while (enumStudentName.hasMoreElements())
            DisplayResultsTxt.append(enumStudentName.nextElement()+ " " + enumStudentMark.nextElement()+ "\n");
        if (e.getSource() == PassedStudentsBtn)
             DisplayResultsTxt.setText("");
             Enumeration enumStudentName = StudentDetailsTbl.keys();
            Enumeration enumStudentMark = StudentDetailsTbl.elements();
            while (enumStudentName.hasMoreElements())
                 int Mark = Integer.parseInt((String)enumStudentMark.nextElement());
                 String Name = (String)enumStudentName.nextElement();
                 if (Mark >=40)
                      DisplayResultsTxt.append(Name + " " + Mark + "\n");
        if (e.getSource() == FailedStudentsBtn)
             DisplayResultsTxt.setText("");
             Enumeration enumStudentName = StudentDetailsTbl.keys();
            Enumeration enumStudentMark = StudentDetailsTbl.elements();
            while (enumStudentName.hasMoreElements())
                 int Mark = Integer.parseInt((String)enumStudentMark.nextElement());
                 String Name = (String)enumStudentName.nextElement();
                 if (Mark <40)
                      DisplayResultsTxt.append(Name + " " + Mark + "\n");
        if (e.getSource() == DistinctionStudentsBtn)
             DisplayResultsTxt.setText("");
             Enumeration enumStudentName = StudentDetailsTbl.keys();
            Enumeration enumStudentMark = StudentDetailsTbl.elements();
            while (enumStudentName.hasMoreElements())
                 int Mark = Integer.parseInt((String)enumStudentMark.nextElement());
                 String Name = (String)enumStudentName.nextElement();
                 if (Mark >=75)
                      DisplayResultsTxt.append(Name + " " + Mark + "\n");
}