listdemo.java

JAVA编程百例书中各章节的所有例子的源代码,包括套接字编程

package ch09.section01;

import javax.microedition.lcdui.*;

//列表实例类
public class ListDemo
    extends BaseListDemo {
  //列表类型
  private static final String[] listTypes = {
      "Exclusive", "Implicit", "Multiple"};

  //创建一个列表实例
  public ListDemo() {
    super("请选择列表类型", listTypes);
  }

  protected Runnable[] getListCallbacks() {
    //该类用于显示列表
    class DisplayList
        extends List
        implements Runnable, CommandListener {
      //点击返回的上一层父类
      private Displayable parent;
      public DisplayList(String listLabel,
                         int listType,
                         String[] data,
                         Image[] images,
                         Displayable parent) {
        super(listLabel, listType, data, images);
        addCommand(new Command("返回", Command.BACK, 1));
        setCommandListener(this);
        this.parent = parent;
      }

      public void run() {
        Display.getDisplay(UIDemo.getInstance()).setCurrent(this);
      }

      //响应按钮事件
      public void commandAction(Command c, Displayable d) {
        if (c.getCommandType() == Command.BACK) {
          Display disp = Display.getDisplay(UIDemo.getInstance());
          disp.setCurrent(parent);
        }
      }
    }

    String[] stringArray = {
        "Option A", "Option B", "Option C"};
    //创建列表形式的选择组
    Runnable[] lists = {
        new DisplayList("Exclusive", ChoiceGroup.EXCLUSIVE, stringArray, null, this),
        new DisplayList("Implicit", ChoiceGroup.IMPLICIT, stringArray, null, this),
        new DisplayList("Multiple", ChoiceGroup.MULTIPLE, stringArray, null, this)
    };
    return (lists);
  }
}