tree.java

Very good Java Applet used to animate Inserting, Deleting and Searching (Preorder & Postorder algori

import java.applet.Applet;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.EventObject;

public class Tree extends Applet
    implements Runnable, ActionListener
{

    public void init()
    {
        runFlag = false;
        thePersonGroup = new personGroup();
        setLayout(new FlowLayout());
        Panel panel = new Panel();
        add(panel);
        panel.setLayout(new FlowLayout());
        Panel panel1 = new Panel();
        panel.add(panel1);
        panel1.setLayout(new FlowLayout(0));
        insButton = new Button("DODAJ");
        panel1.add(insButton);
        insButton.addActionListener(this);
        findButton = new Button("NADJI");
        panel1.add(findButton);
        findButton.addActionListener(this);
        delButton = new Button("OBRISI");
        panel1.add(delButton);
        delButton.addActionListener(this);
//        resetButton = new Button("RESET");
//        panel1.add(resetButton);
//        resetButton.addActionListener(this);
        fillButton = new Button("RESET");
        panel1.add(fillButton);
        fillButton.addActionListener(this);
        inorderButton = new Button("INORDER");
        panel1.add(inorderButton);
        inorderButton.addActionListener(this);
        panel1.add(new Label("Broj cvora:"));
        panel1.add(tf);
        thePersonGroup = new personGroup();
        thePersonGroup.doFill(20);
        setSize(450, 310);
        repaint();
    }

    public void start()
    {
        if(runner == null)
        {
            runner = new Thread(this);
            runner.start();
        }
    }

    public void stop()
    {
        if(runner != null)
        {
            runner.stop();
            runner = null;
        }
    }

    public void paint(Graphics g)
    {
        thePersonGroup.draw(g);
    }

    public void update(Graphics g)
    {
        paint(g);
    }

    public void actionPerformed(ActionEvent actionevent)
    {
        isNumber = true;
        String s = tf.getText();
        try
        {
            GPNumber = Integer.parseInt(s);
        }
        catch(NumberFormatException _ex)
        {
            GPNumber = 0;
            isNumber = false;
        }
        thePersonGroup.setDrawAll(false);
        if(actionevent.getSource() == fillButton)
        {
             thePersonGroup.fill(isNumber, GPNumber);    
             tf.setText("10");
        }
        else
        if(actionevent.getSource() == findButton)
            thePersonGroup.find(isNumber, GPNumber);
        else
        if(actionevent.getSource() == insButton)
            thePersonGroup.insert(isNumber, GPNumber);
        else
        if(actionevent.getSource() == resetButton)
        {
            thePersonGroup.reset(0);
            tf.setText("10");
        }
        else
        if(actionevent.getSource() == delButton)
            thePersonGroup.remove(isNumber, GPNumber);
        else
        if(actionevent.getSource() == inorderButton)
            thePersonGroup.traverse();	
        repaint();
        try
        {
            Thread.sleep(10L);
            return;
        }
        catch(InterruptedException _ex)
        {
            return;
        }
    }

    public void run()
    {
        do
            ;
        while(true);
    }

    public Tree()
    {
        groupSize = 24;
        order = 1;
        GPNumber = -1;
        isNumber = false;
        tf = new TextField("", 1);
        MAX_KEY = 99;
    }

    private Thread runner;
    private int groupSize;
    private personGroup thePersonGroup;
    private boolean runFlag;
    private int order;
    private int GPNumber;
    private boolean isNumber;
    private TextField tf;
    private int MAX_KEY;
    private Button fillButton;
    private Button findButton;
    private Button insButton;
    private Button resetButton;
    private Button delButton;
    private Button inorderButton;
}