midlet3.java

来自「这是郭克华老师的J2ME视频的源代码」· Java 代码 · 共 50 行

package prj11_1;

import java.util.Enumeration;
import java.util.Hashtable;

import javax.microedition.midlet.MIDletStateChangeException;

public class MIDlet3 extends javax.microedition.midlet.MIDlet {

	protected void startApp() throws MIDletStateChangeException {
		Hashtable ht = new Hashtable();
		//添加
		ht.put("姓名", "张三");//key  value
		ht.put("性别", "男");
		ht.put("年龄", new Integer(25));
		
		//通过key获得一个元素的值
		System.out.println(ht.get("姓名"));
		//通过key修改一个元素的值
		ht.put("姓名", "王武");
		System.out.println(ht.get("姓名"));
		//删除
		ht.remove("姓名");
		System.out.println(ht.get("姓名"));
		
		Enumeration enu1 = ht.keys();
		while(enu1.hasMoreElements()){
			System.out.println(enu1.nextElement());
		}
		
		Enumeration enu2 = ht.elements();
		while(enu2.hasMoreElements()){
			System.out.println(enu2.nextElement());
		}
	}

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

	}

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

	}



}