midlet2.java

这是郭克华老师的J2ME视频的源代码

package prj15_1;

import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;
import javax.microedition.rms.RecordStore;

public class MIDlet2 extends MIDlet {

	protected void startApp() throws MIDletStateChangeException {
		RecordStore rs = null;
		try{
			rs = RecordStore.openRecordStore("RS1", true);
			//添加“张三”
			String str1 = "张三";
			byte[] b1 = str1.getBytes();
			rs.addRecord(b1, 0, b1.length);
			System.out.println("当前纪录条数："+ rs.getNumRecords());
			
			//添加“李四光”
			String str2 = "李四光";
			byte[] b2 = str2.getBytes();
			rs.addRecord(b2, 0, b2.length);
			System.out.println("当前纪录条数："+ rs.getNumRecords());
			//修改记录
			String newStr = "李四";
			byte[] newBytes = newStr.getBytes();
			rs.setRecord(2, newBytes, 0, newBytes.length);
			
			
			//根据ID得到纪录
			byte[] b = rs.getRecord(2);
			System.out.println(new String(b));
			
			System.out.println(rs.getRecordSize(1));

		}catch(Exception ex){
			ex.printStackTrace();
		}
		finally{
			try{
				rs.closeRecordStore();
			}catch(Exception ex){}
		}
		

	}
	protected void destroyApp(boolean arg0) throws MIDletStateChangeException {
		// TODO Auto-generated method stub

	}

	protected void pauseApp() {
		// TODO Auto-generated method stub

	}



}