🚀 go-pugleaf

I am trying to play with thread in java now.  I create 5 seperate threads
and then let them chase after my mouse clicks.  However, the performance is
unacceptable.  I am running on P150 - 64M - WindowsNT(SP1).  Below is the
code, please tell me all the bad things I did that killed the performance.

Thanks

package untitled3;

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import borland.jbcl.layout.*;
import borland.jbcl.control.*;

class Element extends Label implements Runnable
  {
  int itsX, itsY;
  int tarX, tarY;
  Thread itsThread;

  public void start()
    {
    itsThread = new Thread(this);
    itsThread.start();
    }
  public void setTarget(int x, int y)
    {
    tarX = x;
    tarY = y;
    }
  public void setText(char c)
    {
    super.setText(new String(new Character(c).toString()));
    }

  public void run()
    {
    itsX = getLocation().x;
    itsY = getLocation().y;
    while (true)
      {
      if (itsX < tarX) itsX++;
      if (itsX > tarX) itsX--;
      if (itsY < tarY) itsY++;
      if (itsY > tarY) itsY--;
      try{Thread.sleep(30);}catch(InterruptedException Ie){};
      setLocation(new Point(itsX, itsY));
      }
    }
  }//class Element

public class Applet1 extends Applet {
  XYLayout xYLayout1 = new XYLayout();
  boolean isStandalone = false;
  TextField Input = new TextField();
  Button GetButton = new Button();
  Element a[] = new Element[5];
  boolean isStarted = false;

  //Get a parameter value
  public String getParameter(String key, String def) {
    return isStandalone ? System.getProperty(key, def) :
      (getParameter(key) != null ? getParameter(key) : def);
  }

  //Construct the applet
  public Applet1() {
  }

  //Initialize the applet
  public void init() {
    try { jbInit(); } catch (Exception e) { e.printStackTrace(); }
  }

  //Component initialization
  public void jbInit() throws Exception{
    this.addMouseListener(new Applet1_this_mouseAdapter(this));
    xYLayout1.setWidth(500);
    xYLayout1.setHeight(500);
    GetButton.setLabel("Get");
    GetButton.addMouseListener(new Applet1_GetButton_mouseAdapter(this));
    this.setLayout(xYLayout1);
    this.add(Input, new XYConstraints(32, 420, 237, 24));
    this.add(GetButton, new XYConstraints(276, 421, 52, -1));
    int i;
    for (i = 0; i < 5; i++)
      {
      a[i] = new Element();
      this.add(a[i], new XYConstraints(i*23, 42, 23, 23));
      }
  }

  //Start the applet
  public void start() {
  }

  //Stop the applet
  public void stop() {
  }

  //Destroy the applet
  public void destroy() {
  }

  //Get Applet information
  public String getAppletInfo() {
    return "Applet Information";
  }

  //Get parameter info
  public String[][] getParameterInfo() {
    return null;
  }

  void GetButton_mouseClicked(MouseEvent e) {
    int i;
    String aTemp = Input.getText();
    for (i = 0; i < aTemp.length(); i++)
      {
      a[i].setText(Input.getText().charAt(i));
      }
  }

  void this_mouseClicked(MouseEvent e) {
    int i;
    if (!isStarted){
      for (i = 0; i < 5; i++)
        {
        a[i].start();
        }
      isStarted = true;
      }
    for (i = 0; i < 5; ++i)
      {
      a[i].setTarget(e.getX() + i * 23, e.getY());
      }
  }
}

class Applet1_GetButton_mouseAdapter extends java.awt.event.MouseAdapter {
  Applet1 adaptee;

  Applet1_GetButton_mouseAdapter(Applet1 adaptee) {
    this.adaptee = adaptee;
  }

  public void mouseClicked(MouseEvent e) {
    adaptee.GetButton_mouseClicked(e);
  }
}

class Applet1_this_mouseAdapter extends java.awt.event.MouseAdapter {
  Applet1 adaptee;

  Applet1_this_mouseAdapter(Applet1 adaptee) {
    this.adaptee = adaptee;
  }

  public void mouseClicked(MouseEvent e) {
    adaptee.this_mouseClicked(e);
  }
}