问答题

下列程序中,定义了一个3行4列的数组A,并将A的内容转换为ASCII码值,并复制到数组B中,然后打印出来。 注意:请勿改动main()主方法和其他已有语句内容,仅在横线处填入适当语句。 public class Example1_4 { private char A[] [] = {{’a’, ’b’, ’c’, ’d’}, {’e’, ’f’, ’g’, ’h’}, {’i’, ’j’, ’k’, ’l’}}; public int ______; //生成一个空的3行4列的数组B public void copy() { for(int i = 0; i < 3; i++) for(int j = 0; j < 4; j++) ______; } public static void main(______ argv[]) { Example1_4 example = new Example1_4(); example.copy(); for(int i = 0; i < 3; i ++) { for(int j = 0; j < 4; j++) System.out.print(example. B[i] [j] *+" "); System.out.println (); } } }

【参考答案】

①B[][]=new int[3][4]②B[i][j]=A[i][j]③String[][解析] 本题主要考查考生对数......

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下面程序是一个计时器,从1000秒开始倒计时,直到为0结束。在界面上有两个按钮,一个可以暂停计时,另一个可以继续已经暂停的计时。请更正题中带下划线的部分。注意:不改动程序的结构,不得增行或删行import java.awt.*;import java.awt.event.*;import java.applet.Applet;public class Example3_4 extends Applet{public Color color = Color.red;private int num= 1000;public Counter theCounter;private Button stop;private Button start;public void init(){stop = new Button( 暂停 );start = new Button ( 继续 );theCounter = new Counter(this);stop.addActionListener(new Lst() implements ActionListener{public void actionPerformed(ActionEvent e){theCounter.sus();}});start.addActionListener(new SuspenListener());add(start);add(stop);theCounter.start();}public void paint(Graphics g){g.setCotor(color);g.drawString(String.valueOf(num),50,50);}public void setInt(int i){num=i;}class SuspenListener implements ActionListener{public void actionPerformed(ActionEvent e){theCounter.conti ();}}}public class Counter extends Thread{Example3_4 example;boolean isHold;Counter (Example3_4 ex){this.example = ex;isHold = false;}public void sus(){isHold = true;}public synchronized void conti(){isHold = false;notify();}public void run(){for (int i = 1000; i>0; i--){if (i%2 == 1)example.color = Color.red;elseexample.color = Color.blue;example.setInt(i);example.repaint();try{sleep(1000);synchronized {while(isHold)wait ( );}}catch (InterruptedException ie){}}}}<HTML><HEAD><TITLE>Example3_4< TITLE>< HEAD><BODY><applet code= Example3_4.class width=300 height=400>< applet>< BODY>< HTML>
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下列程序用来显示用户要求打开的图片。在名为“读取图像”的JFrame框架中有一个单行文本框,用户可以在其中输入图片文件的文件名称,按下“浏览图片”按钮以后,新生成一个对话框,将图片显示在这个对话框中,运行结果如下图所示。请填写横线处的内容。注意:请勿改动main()主方法和其他已有语句内容,仅在横线处填入适当语句。import java.awt.*;import java.awt.event.*;import java.io.*;import javax.swing.*;public class Example2_9{public static void main(String[] args){JFrame frame = new FileNameFrame( 读取图像 );frame.setDefaultCloseOperation(JFrame. EXIT ON CLOSE);frame.setSize(300, 100);frame.show();}}class FileNameFrame extends JFram implements ActionListener{JLabel inputLabel;JTextField fileNameText;JButton containtButton;public FileNameFrame(String titleText){super(titleText);inputLabel = new Jnabel( 请输入图像文件的名称 );fileNameText = new JTextField(10);containtButton = new JButton( 浏览图片 );fileNameText.addActionListener(this);containtButton.addActionListener(this);JPanel panel = new JPanel();panel.add(fileNameText);panel.add(containtButton);Container containt = getContentPane();containt.setLayout(new BorderLayout(3,3));containt.add(inputLabel, BorderLayout.NORTH);containt.add(panel, BorderLayout.CENTER);}public void actionPerformed(ActionEvent e){String fileName = fileNameText.getText();ImageIcon image = ______;ImageDialog dlg = new ImageDialog(this);dlg.setImage(image);dlg.setTitle(fileName);dlg.show();}class ImageDialog extends JDialog{JLabel imageLabel;public ImageDialog(JFrame frame){super(frame);imageLabel = new JLabel();getContentPane().add(imageLabel);this.addWindowListener(new WindowAdapter() {public void windowClosing(WindowEvent e){hide ();}});this.setSize(200, 200);}public void setImage(ImageIcon icon){imageLabel. ______(icon);}}}