Chapter 24 Exercise 8, Introduction to Java Programming, Tenth Edition Y. Daniel LiangY.

24.8 (Animation: array list) Write a program to animate search, insertion, and deletion in an array list, as shown in Figure 24.1a. The Search button searches the specified value in the list. The Delete button deletes the specified value from the list. The Insert button appends the value into the list if the index is not specified; otherwise, it inserts the value into the specified index in the list.

import javax.swing.*;

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;

public class Exercise08 extends JApplet {

 private static final long serialVersionUID = 1L;
 private ArrayListAnimation arrayListAnimation = new ArrayListAnimation();
 private ArrayList<Integer> list = new ArrayList<>();
 private JTextField jtaValue = new JTextField(5);
 private JTextField jtaIndex = new JTextField(5);
 private int foundedValue = -1;
 private int capacity= 4;
  
 public Exercise08() {
  add(arrayListAnimation, BorderLayout.CENTER);
  JPanel jPanel = new JPanel();
  jPanel.add(new JLabel("Enter a value: "));
  jPanel.add(jtaValue);
  jPanel.add(new JLabel("Enter an index: "));
   jPanel.add(jtaIndex);
  JButton jbtSearch = new JButton("Search");
  jPanel.add(jbtSearch);
  JButton jbtInsert = new JButton("Insert");
  jPanel.add(jbtInsert);
  JButton jbtDelete = new JButton("Delete");
  jPanel.add(jbtDelete);
  JButton jbtTrim = new JButton("Trin To Size");
  jPanel.add(jbtTrim);
  add(jPanel, BorderLayout.SOUTH);
  
  jbtInsert.addActionListener(new ActionListener() {   
   @Override
   public void actionPerformed(ActionEvent e) {
    try {
     int value = Integer.parseInt(jtaValue.getText());
     if(jtaIndex.getText().equals("")) {
      list.add(value);
      if(list.size() > capacity) {
       capacity *= 2;
      }
     } else {
      int index = Integer.parseInt(jtaIndex.getText());
      list.add(index, value);
      if(list.size() > capacity) {
       capacity *= 2;
      }
      jtaIndex.setText("");      
     }
     arrayListAnimation.repaint(); 
     jtaValue.setText("");
     foundedValue = -1;
     jtaValue.requestFocus();
    } catch (NumberFormatException e2) {
    } catch (IndexOutOfBoundsException e2) {
    }
   }
  });
  
  jbtDelete.addActionListener(new ActionListener() {
   
   @Override
   public void actionPerformed(ActionEvent e) {
    try {
     int value = Integer.parseInt(jtaValue.getText());
     list.remove(new Integer(value));
     foundedValue = -1;
     arrayListAnimation.repaint();
     jtaValue.setText("");
     jtaValue.requestFocus();
    } catch (NumberFormatException e2) {
    }
   }
  });
  
  jbtSearch.addActionListener(new ActionListener() {
   
   @Override
   public void actionPerformed(ActionEvent e) {
    try {
     int value = Integer.parseInt(jtaValue.getText());     
     foundedValue = list.indexOf(new Integer(value)); 
     arrayListAnimation.repaint();
     jtaValue.requestFocus();
    } catch (NumberFormatException e2) {
    }
   }
  });
  
  jbtTrim.addActionListener(new ActionListener() {
   
   @Override
   public void actionPerformed(ActionEvent e) {
    capacity = list.size();
    if(capacity == 0) {
     capacity = 1;
    }
    arrayListAnimation.repaint();
   }
  });
 }

 class ArrayListAnimation extends JPanel {
  private static final long serialVersionUID = 1L;
  
  @Override
  protected void paintComponent(Graphics g) {
   super.paintComponent(g);
   int size = 40;
   String str = (list.size() == 0 ? "list is empty" : "array list") + ".     size = " + list.size() + " and capacity = " + capacity;
   g.drawString(str, size, size);
   for (int i = 0; i < capacity; i++) {
    g.drawRect(size + (i * size), 2 * size, size, size);
    if(i >= list.size()) {
     g.drawLine(2 * size + (i * size), 2 * size, size + (i * size), 3 * size); 
    } else {
     if(i == foundedValue) {
      g.setColor(Color.RED);
     }
     g.drawString(list.get(i) + "", size + (i * size) + 4, (int)(2.6 * size));
     if(i == foundedValue) {
      g.setColor(Color.BLACK);
     }
    }
   }

  }

 }


 public static void main(String[] args) {
  JFrame frame = new JFrame("Exercise08");
  Exercise08 applet = new Exercise08();
  frame.add(applet);
  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  frame.setSize(800, 300);
  frame.setMinimumSize(new Dimension(frame.getWidth(), frame.getHeight()));
  frame.setLocationRelativeTo(null);
  frame.setVisible(true);
 }
 

}