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标题: 考试题目，帮帮忙啊！！！ [打印本页]

作者: 金针菇 时间: 2006-6-28 22:24
标题: 考试题目，帮帮忙啊！！！
1．写出〈〈  〉〉尖括号内代码的作用（已知原始图片像素大小：宽192*高96）
import javax.microedition.lcdui.*;
import javax.microedition.lcdui.game.*;
public class TiledCanvas extends GameCanvas {
      private Image titledImage;
      private Graphics g;
      private TiledLayer background;
      ①<<private byte[][] titledMap = { {1,2,3},
                     {4,5,6},
                     {7,8,9},
                     {7,7,7},
                     {7,7,7},
                     {7,7,7}};>>
      protected TiledCanvas() {
            super(true);
            try {
                     titledImage = Image.createImage("/title1.png");
            } catch (Exception e) {       }
            g = this.getGraphics();
            ②<<background = new TiledLayer(3,6,titledImage,64,32);>>
            for(int i=0;i<6;i++)
                     for(int j=0;j<3;j++){
                              ③<<background.setCell(j,i,titledMap[j]);>>
                     }
            ④<<background.paint(g);
            flushGraphics();>>
            }
}
答：
①
②
③
④
2．写出〈〈  〉〉尖括号内代码的作用（已知原始图片像素大小：宽96*高192）
import javax.microedition.lcdui.*;
import javax.microedition.lcdui.game.*;
public class SpriteCanvas extends GameCanvas implements Runnable{
      private int drawX = 0;
      private int drawY = 0;
      private Sprite sprite;
      private Image spriteImage;
      private Graphics g;
      ①〈〈private int down_seq[] = {0,1,2}; 〉〉
      protected SpriteCanvas() {
            super(true);
            try{
                     spriteImage = Image.createImage("/man.png");
            }catch(Exception e){}
            ②〈〈sprite = new Sprite(spriteImage,32,48);
            sprite.setFrameSequence(down_seq);〉〉
            g = this.getGraphics();
            Thread thread = new Thread(this);
            thread.start();
      }
      public void run() {
            while(true){
                     try {
                              ③〈〈Thread.sleep(100);〉〉
                     } catch (InterruptedException e) {
                              e.printStackTrace();
                     }
                     g.setColor(255,255,255);
                     g.fillRect(0,0,getWidth(),getHeight());
                     ④〈〈sprite.nextFrame();〉〉
                     if(drawY + 5 < getHeight()){
                              drawY = drawY +5;
                              sprite.setPosition(drawX,drawY);
                     }
                     else{
                              drawY = 0;
                              sprite.setPosition(drawX,drawY);
                     }
                     sprite.paint(g);
                     flushGraphics();
            }
      }
}
答：
①
②
③
④

3．简述Comparator类所起的作用，写出程序运行的结果。
import javax.microedition.midlet.*;
import javax.microedition.rms.*;
public class RecordSort extends MIDlet {
      private RecordStore rs=null;
      static final String REC_STORE="db_1";
      public RecordSort() {
            openRecStore();
            writeRecord("Shanghai");
            writeRecord("SiChuan");
            writeRecord("ChengDu");
            writeRecord("BeiJing");
            readRecords();
            closeRecStore();//关闭RecordStore
            deleteRecStore();//删除RecordStore
      }
      public void openRecStore(){
            try{
                     //如果RecordStore不存在，就创建新的
                     rs=RecordStore.openRecordStore(REC_STORE,true);
            }catch (Exception e){
                     db(e.toString());
            }
      }

      public void readRecords(){
            try{
                     if(rs.getNumRecords()>0){
                              Comparator comp=new Comparator();
                              RecordEnumeration re=rs.enumerateRecords(null,comp,false);
                              while(re.hasNextElement()){
                                    String str=new String(re.nextRecord());
                                    System.out.println(str);
                                    System.out.println("-----------------------");
                              }
                     }
            }catch(Exception e){
                     db(e.toString());
            }
            。。。代码略
      }

      class Comparator implements RecordComparator{
            public int compare(byte[] rec1,byte[] rec2){
                     String str1=new String(rec1);
                     String str2=new String(rec2);
                     int result=str1.compareTo(str2);
                     if(result==0)
                              return RecordComparator.EQUIVALENT;
                     else if(result<0)
                              return RecordComparator.PRECEDES;
                     else
                              return RecordComparator.FOLLOWS;
            }
      }
}

4．阅读代码写出程序运行结果
如果解除三行代码的注释，这三行代码的运行结果是什么？
import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;
public class translateOrigin extends MIDlet implements CommandListener {
      private Command exitCommand;
      private translateOriginCanvas sg;
      public translateOrigin() {
            exitCommand = new Command("Exit", Command.EXIT, 1);
            sg = new translateOriginCanvas();
            sg.addCommand(exitCommand);
            sg.setCommandListener(this);
            Display.getDisplay(this).setCurrent(sg);
      }
      protected void startApp() {       }
      protected void pauseApp() {       }
      protected void destroyApp(boolean arg0) { }
      public void commandAction(Command c, Displayable d) {
            if (c == exitCommand) {
                     destroyApp(false);
                     notifyDestroyed();
            }
      }
}
class translateOriginCanvas extends Canvas {
      protected void paint(Graphics g) {
            for (int i = 1; i <= 5; i++) {
g.drawString("String--"+ String.valueOf(i), 0, 0, Graphics.TOP |
Graphics.LEFT);
                     g.translate(20,20);
            }
            /*①String s = String.valueOf(g.getTranslateX());
            ②g.translate(-100,-100);
            ③g.drawString(s,0,0,Graphics.TOP | Graphics.LEFT);
      */
      }
}

作者: cr19800604 时间: 2006-6-29 11:15
不好意思，这些题目不会做，我要努力了；
后2题可以在运行环境中解决阿

作者: Chenny 时间: 2006-6-29 11:26
hehe 努力

[ 本帖最后由 Chenny 于 2006-6-29 11:27 编辑 ]

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