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51 import java.awt.*;
52 import java.util.*;
53
54 public class Blink extends java.applet.Applet  {
55 private Timer timer; private String labelString; private int delay;
59 public void init() {
60 String blinkFrequency = getParameter("speed");
61 delay = (blinkFrequency == null) ? 400 :
62 (1000 / Integer.parseInt(blinkFrequency));
63 labelString = getParameter("lbl");
64 if (labelString == null)
65 labelString = "Blink";
66 Font font = new java.awt.Font ("Serif", Font.PLAIN, 24);
67 setFont(font);
68 }
69
70 public void start() {
71 timer = new Timer(); timer.schedule(new TimerTask() { public void run() {
75 repaint();
76 }
77 }
78 , delay, delay);
79 }
80
81 public void paint(Graphics g) {
82 int fontSize = g.getFont().getSize();
83 int x = 0, y = fontSize, space;
84 int red = (int) ( 50 * Math.random());
85 int green = (int) ( 50 * Math.random());
86 int blue = (int) (256 * Math.random());
87 Dimension d = getSize();
88 g.setColor(Color.black);
89 FontMetrics fm = g.getFontMetrics();
90 space = fm.stringWidth(" ");
91 for (StringTokenizer t = new StringTokenizer(labelString);
92 t.hasMoreTokens();) {
93 String word = t.nextToken();
94 int w = fm.stringWidth(word) + space;
95 if (x + w > d.width) {
96 x = 0;
97 y += fontSize; }
99 if (Math.random() < 0.5)
100 g.setColor(new java.awt.Color ((red + y*30) % 256,
101 (green + x/3) % 256, blue));
102 else
103 g.setColor(getBackground());
104 g.drawString(word, x, y);
105 x += w; }
107 }
108
109 public void stop() {
110 timer.cancel(); }
112
113 public String getAppletInfo() {
114 return "Title: Blinker\n"
115 + "Author: Arthur van Hoff\n"
116 + "Displays multicolored blinking text.";
117 }
118
119 public String [][] getParameterInfo() {
120 String pinfo[][] = {
121 {"speed", "string", "The blink frequency"},
122 {"lbl", "string", "The text to blink."},
123 };
124 return pinfo;
125 }
126 }
127
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Java API By Example, From Geeks To Geeks.