J2ME环境配置
Eclipse下J2ME配置
Eclipse版本：Release 3.5.2 英文版
1.安装 EclipseME（已经安装Eclipse的基本框架）
Help > Install New Software... 弹出对话框（图1）
图1
点击按钮“Add…”，弹出对话框并填入字符串（图2），点击按钮“OK”，即可更新安装。
图2
2.Eclipse设备配置 （开发需要虚拟设备支持）
首先安装sun java wireless toolkit。
Windows > Preferences > J2ME > Device Management，如图3
图3
点击“Import…”，弹出对话框，如图4。点击“Browse…”，选择sun java wireless toolkit的安装目录 > 点击“Refresh” > 点击“Finish”。
图4
3.Eclipse调试配置
Windows > Preferences > Java > Debug，如图5，保证框1中不被选中，一般推荐把框2时间改为至少15000。
图5
4.Eclipse 混淆器配置 (打包用)
下载proguard4.4.zip包，解压即可。Windows > Preferences > J2ME >Packaging > Obfuscation，如图6，选择Proguard4.4的存放目录，点击“OK”即可。
图6
5.新建J2ME Midlet Suite项目HelloWorldMidlet，编写第一个程序MyMIDlet，如表1
表1
//MyMIDlet.java
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;
import javax.microedition.midlet.MIDlet;
public class MyMIDlet extends MIDlet {
?????? private Form form;
?????? private final Command cmdExit = new Command("Exit",Command.EXIT,1);
?????? private char[] charArray = {
???????????????????? 'T','h','i','s',' ','i','s',' ',
???????????????????? 'm','y',' ','f','i','r','s','t',' ','J','2','M','E',' ',
???????????????????? 'p','r','o','g','r','a','m','.'};
?????? public MyMIDlet() {
????????????? // TODO Auto-generated constructor stub
????????????? form = new Form("Hello MyJ2ME");
?????????????
????????????? StringBuffer strBuf = new StringBuffer();
????????????? for(int i=0; i<charArray.length; i++)
????????????? {
???????????????????? strBuf.append(charArray[i]);
????????????? }
?????????????
????????????? form.append(strBuf.toString());
????????????? form.addCommand(cmdExit);
????????????? form.setCommandListener(new CommandListener(){
???????????????????? public void commandAction(Command arg0, Displayable arg1) {
??????????????????????????? // TODO Auto-generated method stub
??????????????????????????? if(cmdExit == arg0){
?????????????????????????????????? notifyDestroyed();
?????????????????????????????????? destroyApp(true);
??????????????????????????? }
???????????????????? }
????????????????????
????????????? });
?????? }
?????? protected void startApp(){
????????????? // TODO Auto-generated method stub
????????????? Display.getDisplay(this).setCurrent(form);
?????? }
?????? protected void pauseApp() {
????????????? // TODO Auto-generated method stub
?????? }
?????? protected void destroyApp(boolean arg0){
????????????? // TODO Auto-generated method stub
?????? }
6.打包生成手机可安装的文件
如图7操作，将在deployed文件夹生成可安装文件，把该文件夹中所有文件拷贝到手机中，手机中点击HelloWorldMidlet.jad即可将其安装。
图7
标注:此过程中可能报错“…Could not find jar tool executable…”,解决方案：windows > preferences > java > installed jres，把已经安装的JRE的目录修改为jdk的安装目录。