midlet3.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 MIDlet3 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);
			
			//添加“李四光”
			String str2 = "李四光";
			byte[] b2 = str2.getBytes();
			rs.addRecord(b2, 0, b2.length);
			
			System.out.println(rs.getNumRecords());
			//删除张三
			rs.deleteRecord(1);
			
			System.out.println(rs.getNumRecords());
			
			System.out.println(new String(rs.getRecord(2)));
			
			rs.addRecord("中国".getBytes(), 0, 4);
			System.out.println(new String(rs.getRecord(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

	}



}