J2ME慢慢学教程

      第七章：使用Kjava GUI组件的开发

    * 介绍

    * Spotlet 介绍

    * KJava 应用程序 HelloWorld

    * HelloWorld -- 完整的代码清单

import com.sun.kjava.Button;
import com.sun.kjava.Graphics;
import com.sun.kjava.Spotlet;

/**
 * Simple demonstration, "Hello World" program. Note that Spotlet is
 * the class that provides callbacks for event handling.
 */
public class HelloWorld extends Spotlet {
    /** Stores a reference to the "Exit" button. */
    private static Button exitButton;
    /**
     * Main entry point for this program.
     */
    public static void main(String[] args) {
        (new HelloWorld()).register(NO_EVENT_OPTIONS);
    }

    /**
     * Constructor: draws the screen.
     */
    public HelloWorld() {
        // Create (initially invisible) the "Exit" button
        exitButton = new Button("Exit", 70, 145);

        // Get a reference to the graphics object;
        // i.e. the drawable screen
        Graphics g = Graphics.getGraphics();
        g.clearScreen();

        // Draw the text, "Hello World!" somewhere near the center
        g.drawString("Hello World!", 55, 45, g.PLAIN);

        // Draw the "Exit" button
        exitButton.paint();
    }

    /**
     * Handle a pen down event.
     */
    public void penDown(int x, int y) {
        // If the "Exit" button was pressed, end this application
        if (exitButton.pressed(x, y)) {
            System.exit(0);
        }
    }
}

    * KJava GUI 组件

    * 其它的 KJava 类

      第八章：使用Kjava事件处理的开发    

    * 介绍

    * 处理笔的移动

    * 处理键盘输入，电子束定向发送／接收，以及未知事件

    * Scribble 应用程序介绍

    * 开始使用 Scribble

    * 定义方法和事件处理程序

      第九章：MIDP API  

    * 介绍

    * UI 设计注意事项

    * MIDP API

    * MIDlet 介绍

    * HelloWorld MIDlet

private Form form;

public HelloWorld() {
    // Create a new form on which to display our text
    form = new Form("Test App");

    // Add the text "Hello World!" to the form
    form.append("Hello World!");

    // Add a command button labeled "Exit"
    form.addCommand(new Command("Exit", Command.EXIT, 1));

    // Register this object as a commandListener
    form.setCommandListener(this);
}

    * MIDP 软件包

      第十章：CDC API   

    * 介绍

    * CDC 的目标设备

    * CDC API 概述

      第十一章：总结    

    * 总结

    * 参考资料