import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;

public class lab4 extends JFrame {
    private JTextArea jta;
    private Histogram histogram = new Histogram();

    public lab4()
    {
        // Store text area in a scroll pane
        JScrollPane scrollPane = new JScrollPane(jta = new JTextArea());
        jta.setWrapStyleWord(true);
        jta.setLineWrap(true);
        jta.setPreferredSize(new Dimension(800,300));
        jta.setLayout(new GridLayout(2,1,1,1));




        add(scrollPane);

        jta.addKeyListener(new KeyAdapter() {
                  /** Handle the button action */
                  public void KeyPressed(KeyEvent e) {
                        // Count the letters in the text area
                        int[] count = countLetters();

                    // Set the letter count to histogram for display
                        histogram.showHistogram(count);


                  }
            });


        jta.add(histogram);
    }



    private int[] countLetters()
    {
        // Count for 26 letters
        int[] count = new int[26];

        // Get contents from the text area
        String text = jta.getText();

        text = text.toUpperCase();

        // Count occurrence of each letter (case insensitive)
        for (int i = 0; i < text.length(); i++)
        {
          char character = text.charAt(i);

          if ((character >= 'A') && (character <= 'Z'))
          {
            count[(int)character - 65]++; // The ASCII for 'A' is 65
          }
          }
          return count; // Return the count array
      }



    public static void main(String[] args) {
       lab4 frame = new lab4();
       frame.setLocationRelativeTo(null); // Center the frame
       frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
       frame.setTitle("lab4");
       frame.setSize(800,600);
       frame.pack();
       frame.setVisible(true);

    }
}

import javax.swing.*;
import java.awt.*;

public class Histogram extends JPanel {
  // Count the occurrence of 26 letters
  private int[] count;

  /** Set the count and display histogram */
  public void showHistogram(int[] count) {
    this.count = count;
    repaint();
  }

  /** Paint the histogram */
  protected void paintComponent(Graphics g) {
    if (count == null) return; // No display if count is null

    super.paintComponent(g);

    // Find the panel size and bar width and interval dynamically
    int width = getWidth();
    int height = getHeight();
    int interval = (width - 40) / count.length;
    int individualWidth = (int)(((width - 40) / 24) * 0.60);

    // Find the maximum count. The maximum count has the highest bar
    int maxCount = 0;
    for (int i = 0; i < count.length; i++) {
      if (maxCount < count[i])
        maxCount = count[i];
    }

    // x is the start position for the first bar in the histogram
    int x = 30;

    // Draw a horizontal base line
    g.drawLine(10, height - 45, width - 10, height - 45);
    for (int i = 0; i < count.length; i++) {
      // Find the bar height
      int barHeight =
        (int)(((double)count[i] / (double)maxCount) * (height - 55));

      // Display a bar (i.e. rectangle)
      g.drawRect(x, height - 45 - barHeight, individualWidth,
        barHeight);

      // Display a letter under the base line
      g.drawString((char)(65 + i) + "", x, height - 30);

      // Move x for displaying the next character
      x += interval;
    }
  }

  /** Override getPreferredSize */
  public Dimension getPreferredSize() {
    return new Dimension(300, 300);
  }
}

        jta.addKeyListener(new KeyListener() {
                  /** Handle the button action */
                  public void keyPressed(KeyEvent e) {
                        // Count the letters in the text area
                        int[] count = countLetters();

                    // Set the letter count to histogram for display
                        histogram.showHistogram(count);
                  }

    public void keyReleased(KeyEvent e) {
    }
    public void keyTyped(KeyEvent e) {                
    }
            });

    public lab4()
    {
    	setLayout(new GridLayout(2,1,1,1));
        // Store text area in a scroll pane
    	jta = new JTextArea();
        JScrollPane scrollPane = new JScrollPane(jta);
        jta.setWrapStyleWord(true);
        jta.setLineWrap(true);
        jta.setPreferredSize(new Dimension(800,300));

        add(scrollPane);

        jta.addKeyListener(new KeyListener() {
                  /** Handle the button action */
                  public void keyPressed(KeyEvent e) {
                        // Count the letters in the text area
                        int[] count = countLetters();

                    // Set the letter count to histogram for display
                        histogram.showHistogram(count);
                  }

				public void keyReleased(KeyEvent e) {
					// TODO Auto-generated method stub
				}
				public void keyTyped(KeyEvent e) {
					// TODO Auto-generated method stub
					
				}
            });


        add(histogram);
    }

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;

public class lab4 extends JFrame {
    private JTextArea jta = new JTextArea();
    private Histogram histogram = new Histogram();


      // Create a new frame to hold the histogram panel
     private JPanel histogramFrame = new JPanel();

        public lab4()
        {
            setLayout(new GridLayout(2,1,1,1));
            // Store text area in a scroll pane
            JTextArea jta;
            JScrollPane scrollPane = new JScrollPane(jta = new JTextArea()); //had to put this here otherwise -1 pt out of 10.... hard nosed teachers><
            jta.setWrapStyleWord(true);
            jta.setLineWrap(true);
            jta.setPreferredSize(new Dimension(800,300));

           add(scrollPane);

           jta.addKeyListener(new KeyListener() {
                     /* Handle the button action */
                     public void keyPressed(KeyEvent e) {
                         // Count the letters in the text area
                           int[] count = countLetters();

                       // Set the letter count to histogram for display
                           histogram.showHistogram(count);
                     }

       public void keyReleased(KeyEvent e) {
          
       }
       public void keyTyped(KeyEvent e) {
          
       }
               });


           add(histogram);
       }



    private int[] countLetters()
    {
        // Count for 26 letters
        int[] count = new int[26];

        // Get contents from the text area
        String text = jta.getText();

        text = text.toUpperCase();

        // Count occurrence of each letter (case insensitive)
        for (int i = 0; i < text.length(); i++)
        {
          char character = text.charAt(i);

          if ((character >= 'A') && (character <= 'Z'))
          {
            count[(int)character - 65]++; // The ASCII for 'A' is 65
          }
          }
          return count; // Return the count array
      }



    public static void main(String[] args) {
       lab4 frame = new lab4();
       frame.setLocationRelativeTo(null); // Center the frame
       frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
       frame.setTitle("lab4");
       frame.setSize(800,600);
       frame.pack();
       frame.setVisible(true);

    }
}