Java ME的Hello World

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文章

翻译:

翻译自: Hello World in Java ME

由 User:Linux achi

最后由 hamishwillee 在 16 Dec 2011 编辑

假如我們想要學習一個新的語言，第一個程式總會是傳統的"Hello World!"

這一個程式會使用一個字串項目跟一個exit按鈕來建立一個新的表單。

要安裝Nokia設備所需要的開發工具，見文章開始使用Java ME、安裝S60的Java ME開發工具及使用MTJ建立第一支MIDlet。

package com.example.helloworld;
 
import javax.microedition.midlet.MIDlet;
import javax.microedition.lcdui.*;
 
public class HelloWorldMidlet extends MIDlet implements CommandListener {
 
    public HelloWorldMidlet() {
    }
    // Display
    private Display display;
    // Main form
    private Form form;
    // For the message
    private StringItem stringItem;
    // For the exit command
    private Command exitCommand;
 
    public void commandAction(Command command, Displayable displayable) {
        if (displayable == form) {
            if (command == exitCommand) {
                exitMIDlet();
            }
        }
    }
 
    public void startApp() {
        // Create form
        stringItem = new StringItem("Hello", "Hello World!");
        form = new Form(null, new Item[] {stringItem});
        exitCommand = new Command("Exit", Command.EXIT, 1);
        form.addCommand(exitCommand);
        form.setCommandListener(this);
 
        // Get display for drawning
        display = Display.getDisplay(this);        
        display.setCurrent(form);
    }
 
    // Your MIDlet should not call pauseApp(), only system will call this life-cycle method
    public void pauseApp() {
    }
 
    // Your MIDlet should not call destroyApp(), only system will call this life-cycle method    
    public void destroyApp(boolean unconditional) {
    }
 
    public void exitMIDlet() {
        display.setCurrent(null);
        notifyDestroyed();
    }
 
}

相关链接

• Java ME 中文 Homepage