[Masaki-HIGA:~/java-rep/rep#8] j03043% cat rep8.java                                                                                        

import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;

public class rep8 extends Applet implements Runnable {
    Thread th = null;
    int x=100,y=350, a=40;
    int vx=-5,vy=-5,va=10;
    int flag=1;
    public void init() {
        setBackground(Color.black);
    }

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

    public void run() {
        while(true) {
                x += vx;
                y += vy;
                if(x < 20 || x > 100) vx=-vx;
                if(y < 270 || y > 350) vy=-vy;
                if(flag==1) {
                    a += va;
                    if(a == 210) {
                        flag=2;
                    }
                }
                if(flag==2) {
                    a += -va;
                    if(a == 30) {
                        flag=1;
                    }
                }
       
            try{
                repaint();
                th.sleep(300);
            }
            catch(Exception ex) {}
        }
    }       
            public void paint(Graphics g) {
                Random r = new Random();
                g.setColor(new Color(r.nextInt()));
                g.setFont(new Font("Dialog",Font.BOLD,a));
                if(flag==1) {
                    g.drawString("I'm Coming",x,y);
                }
                if(flag==2) {
                    g.drawString("I'm Going",x,y);
                }
            }
}