这些填空题，你会吗？来个学JAVA的 帮忙解答一下。我是学的c#

[ay_changyafei]

3：
1.单击鼠标右键，实现弹出式多级菜单，通过“color”选择颜色；
2.在文本框中根据选择的颜色设置输出字符的颜色；
3.单击鼠标右键，选择“exit”可以退出程序。

import javax.swing.*;
import java.awt.event.*;
import java.awt.*;

//*********Found**********
public class Java_3 extends ______________________ implements ActionListener
{
//*********Found**********
   private ____________________ pop;
   private JMenu subPop;
   private JMenuItem color;
   private JMenuItem exit;
   private JMenuItem red;
   private JMenuItem blue;
   private JTextArea textArea;
   private JFrame frame;
	
   public void initGUI()
   {
      pop=new JPopupMenu();

      subPop=new JMenu("color");
      //*********Found**********
      red=new JMenuItem("______________________");
      red.addActionListener(this);
      blue=new JMenuItem("blue");
      blue.addActionListener(this);
      subPop.add(red);
      subPop.add(blue);

      exit=new JMenuItem("exit");
      exit.addActionListener(this);
	
      pop.add(subPop);
      pop.add(exit);
	
      frame=new JFrame("popup frame");
      textArea=new JTextArea("",10,10);
	
      textArea.addMouseListener(this);
      //*********Found**********
      frame.getContentPane().add(____________________);
      frame.setSize(300,300);
      frame.setVisible(true);
	
      frame.addWindowListener(new WindowAdapter()
      {
         public void windowClosing(WindowEvent e)
         {
            System.exit(0);
         }
      });
   }
	
   public void actionPerformed(ActionEvent event)
   {
      if(event.getSource()==red)
      {
         //*********Found**********
         textArea.setForeground(Color._____________________);
         textArea.setText("red menu is selected");
      }
      else if(event.getSource()==blue)
      {
         textArea.setForeground(Color.blue);
         textArea.setText("blue menu is selected");
      }
      else if(event.getSource()==exit)
      {
         frame.setVisible(false);
         System.exit(0);
      }
   }
	
   public void mousePressed(MouseEvent e)
   {
      if(e.getModifiers()==e.BUTTON3_MASK)
      {
         pop.show(e.getComponent(),e.getX(),e.getY());
      }
   }
	
   public static void main(String args[])
   {
      Java_3 example=new Java_3();
      example.initGUI();
   } 
}

6：在JFrame窗口中，显示出红色的2008北京奥运主题口号“同一个世界，同一个梦想”，同时在窗口的上方，有三个按钮可以改变窗口的背景色。该程序的运行结果如下：

import java.awt.event.*;
import java.awt.*;
import java.awt.font.*;
import java.awt.geom.*;
import javax.swing.*;

public class Java_3
{
   public static void main(String[] args)
   {
      FontFrame frame = new FontFrame();
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.setVisible(true);
   }
}

//**********Found**********
class FontFrame extends ________________
{
   public FontFrame()
   {
      setTitle("北京 2008");
      setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
      FontPanel panel = new FontPanel();
      Container contentPane = getContentPane();
      //**********Found**********
      contentPane.add(_____________________);
   }
   public static final int DEFAULT_WIDTH = 400;
   public static final int DEFAULT_HEIGHT = 250;
}

class FontPanel extends JPanel
{
   public FontPanel()
   {
      JButton yellowButton = new JButton("Yellow");
      JButton blueButton = new JButton("Blue");
      JButton redButton = new JButton("Green");
      add(yellowButton);
      add(blueButton);
      add(redButton);
      ColorAction yellowAction = new ColorAction(Color.YELLOW);
      ColorAction blueAction = new ColorAction(Color.BLUE);
      ColorAction greenAction = new ColorAction(Color.GREEN);
      yellowButton.addActionListener(yellowAction);
      blueButton.addActionListener(blueAction);
      redButton.addActionListener(greenAction);
   }
   public void paintComponent(Graphics g)
   {
      super.paintComponent(g);
      Graphics2D g2 = (Graphics2D)g;
      String message = "同一个世界，同一个梦想！";
      Font f = new Font("隶书", Font.BOLD, 27);
      g2.setFont(f);
      FontRenderContext context = g2.getFontRenderContext();
      Rectangle2D bounds = f.getStringBounds(message, context);
      double x = (getWidth() - bounds.getWidth()) / 2;
      double y = (getHeight() - bounds.getHeight()) / 2;
      double ascent = -bounds.getY();
      double baseY = y + ascent;
      g2.setPaint(Color.RED);
      g2.drawString (message, (int)x, (int)(baseY));
   }
   //**********Found**********
   private class ColorAction ____________________ ActionListener
   {
      public ColorAction(Color c)
      {
         BackgroundColor = c;
      }
      //**********Found**********
      public void _____________________ (ActionEvent event)
      {
         setBackground(BackgroundColor);
      }
      private Color BackgroundColor;
   }
}

9：在图形用户界面中，在JFrame窗口的左上方，有一个“红军不怕远征难”的字符串，用户可以通过窗口中的File菜单下的Open子菜单来选择014.JPG图片或306.JPG图片并显示。在窗口下方有一个选择框可对“红军不怕远征难”的字符串进行字体选择。

import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;

public class Java_3
{
   public static void main(String[] args)
   {
      JFrame frame = new ImageViewerFrame();
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.setVisible(true);
   }
}

class ImageViewerFrame extends JFrame
{
   public ImageViewerFrame()
   {
      setTitle("ImageViewer");
      setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
      label = new JLabel();
      Container contentPane = getContentPane();
      contentPane.add(label,BorderLayout.CENTER);
      chooser = new JFileChooser();
      chooser.setCurrentDirectory(new File("."));
      JMenuBar menuBar = new JMenuBar();
      setJMenuBar(menuBar);
      JMenu menu = new JMenu("File");
      menuBar.add(menu);
      JMenuItem openItem = new JMenuItem("Open");
      //*********Found**********
      _______________.add(openItem);
      //*********Found**********
      openItem.___________________________(new ActionListener()
         {  
            public void actionPerformed(ActionEvent evt)
            {  
               int r = chooser.showOpenDialog(null);
               if(r == JFileChooser.APPROVE_OPTION)
               {  
          //*********Found**********
                  String name = __________________.getSelectedFile().getPath();
                  label.setIcon(new ImageIcon(name));
               }
            }
         });
      labelT = new JLabel("红军不怕远征难");
      labelT.setFont(new Font("隶书", Font.PLAIN, DEFAULT_SIZE));
      contentPane.add(labelT, BorderLayout.NORTH );
      faceCombo = new JComboBox();
      faceCombo.setEditable(true);
      faceCombo.addItem("隶书");
      faceCombo.addItem("华文新魏");
      faceCombo.addItem("华文行楷");
      faceCombo.addItem("华文隶书");
       //*********Found**********
      faceCombo.________________________(new
         ActionListener()
         {  
            public void actionPerformed(ActionEvent event)
            {
       //*********Found**********
               labelT.setFont(new Font((String)____________________.getSelectedItem(),
                  Font.PLAIN, DEFAULT_SIZE));
            }
         });
      JPanel comboPanel = new JPanel();
      comboPanel.add(faceCombo);
      contentPane.add(comboPanel, BorderLayout.SOUTH);
   }
   private JLabel label;
   private JLabel labelT;
   private JFileChooser chooser;
   private JComboBox faceCombo;
   private static final int DEFAULT_SIZE = 24;
   public static final int DEFAULT_WIDTH = 570;
   public static final int DEFAULT_HEIGHT = 400;
}

10：计算并打印1,3,5,7的阶乘以及这些阶乘的和。完成程序，使程序输出结果如下：
1!= 1
3!= 6
5!= 120
7!= 5040
Sum=5167

public class Java_1
{
   
   public static void main(String[] args)
   {
      long sum;
      //*********Found**********
      ___________________;
      for(int i=1;i<8;i+=2){
          long b=1;
          //*********Found**********
          for(int j=1; j<=___________; j++) 
          //*********Found**********  
              __________________;
          System.out.println( i + "!= " + b);
          sum+=b;
      }
      System.out.println("sum=" + sum);
      
   }
}

[ay_changyafei]

11：完成程序，使程序输出结果如下图所示。点击open file按钮，打开文件对话框，选择文件，则文本框中输出所选文件的路径；点击save file按钮，打开文件对话框，在对话框中输入文件名，则文本框中输出保存文件的路径。

import javax.swing.*;
import java.awt.event.*;
import java.io.*;
import java.awt.*;

public class Java_2 implements ActionListener {
private JFrame frame;
private JButton button,saveButton;
private JTextArea textArea;
private JFileChooser dia;
private JPanel buttonPanel;

public void init() {
frame=new JFrame("file chooser");
dia=new JFileChooser();
button=new JButton("open file");
button.setActionCommand("open");
//*********Found**********
_______________________________(this);

saveButton=new JButton("save file");
//*********Found**********
_______________________________(this);

buttonPanel=new JPanel();
buttonPanel.add(button);
buttonPanel.add(saveButton);

textArea=new JTextArea("",10,10);
//*********Found**********
frame.getContentPane().add(__________________,BorderLayout.NORTH);
frame.getContentPane().add(textArea,BorderLayout.CENTER);

frame.setSize(300,300);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
//*********Found**********
public void ________________________(ActionEvent event) {
//*********Found**********
if(event.getActionCommand().equals("_______________"))
dia.showOpenDialog(frame);
else
dia.showSaveDialog( frame );

dia.setVisible(true);
File file=dia.getSelectedFile();
if (file!=null){
String fileName=file.getAbsolutePath();
textArea.append("path of selected file: "+fileName+"\r\n");
}
}
public static void main(String args[]){
Java_2 example=new Java_2();
example.init();
}
}
14：程序列出当前目录下所有文件和文件夹的名称。如果当前目录含有子文件夹，则也递归地列出子文件夹的内容，用缩进地方式反映层次关系，文件夹的名称用尖括号括起来。某次运行结果如下：
当前的工作目录是：Z：\test
Java_2.class
<source>
<Java1>
Java_1.java
<Java2>
Java_2.java
<Java3>
Java_3.java
import java.io.File;

public class Java_2
{
public static void main(String s[])
{
//Getting the Current Working Directory
String curDir = System.getProperty("user.dir");
System.out.println("当前的工作目录是:"+curDir);

//*********Found**********
File ff=new File(____________________);
String[] files=ff.list();
for(int i=0; i<files.length; i++)
{
String ss=curDir+"\\"+files[i];
traverse(0,ss);
}
}

/**
* 递归地遍历目录树
* @param level 目录的层次
* @param s 当前目录路径名
*/
public static void traverse(int level,String s)
{
File f=new File(s);
for(int i=0; i<level; i++) System.out.print(" ");
if(f.isFile())
{
System.out.println(f.getName());
}
else if(f.isDirectory())
{
//*********Found**********
System.out.println("<"+f._____________________+">");
String[] files=f.list();
level++;
//*********Found**********
for(int i=0; i<files.length;________________________)
{
String ss=s+"\\"+files[i];
//*********Found**********
traverse(_____________________,ss);
}
}
else
{
System.out.println("ERROR!");
}
}
}

15：1.点击上图中的“JDialog”按钮，弹出下图所示的对话框；
2.输入姓名、口令后，在上图文本框中显示下图所输入的数据。

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

//*********Found**********
public class Java_3 __________________ WindowAdapter implements ActionListener
{
private JFrame frame;
private JTextField name;
private JPasswordField pass;
private JLabel nameLabel;
private JLabel passLabel;
private JPanel textPanel;
private JPanel labelPanel;
private JButton button;
private JTextArea textArea;

public void initGUI()
{
frame=new JFrame("Frame with Dialog");
frame.addWindowListener(this);
button=new JButton("JDialog");
//*********Found**********
button._______________(this);
textArea=new JTextArea("",3,10);

frame.getContentPane().add(textArea,BorderLayout.CENTER);
frame.getContentPane().add(button,BorderLayout.NORTH);

frame.setSize(400,300);
frame.setVisible(true);

}

public void actionPerformed(ActionEvent e)
{
final JDialog dia=new JDialog(frame,"login information");
JButton ok=new JButton("ok");
ok.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
textArea.setText("");
textArea.append("name:"+name.getText()+"\r\n");
textArea.append("passWord:"+new String(pass.getPassword())+"\r\n");
//*********Found**********
dia.setVisible(________________); //隐藏对话框
}
});

name=new JTextField("",10);
pass=new JPasswordField("",10);
pass.setEchoChar('*');
textPanel=new JPanel();
textPanel.setLayout(new GridLayout(2,1,10,10));
textPanel.add(name);
textPanel.add(pass);

nameLabel=new JLabel("name");
passLabel=new JLabel("passWord");
labelPanel=new JPanel();
labelPanel.setLayout(new GridLayout(2,1,20,20));
labelPanel.add(nameLabel);
labelPanel.add(passLabel);

dia.getContentPane().add(labelPanel,BorderLayout.WEST);
dia.getContentPane().add(textPanel,BorderLayout.CENTER);
dia.getContentPane().add(ok,BorderLayout.SOUTH);
dia.setSize(200,130);
dia.setVisible(true);
}

public void windowClosing(WindowEvent event)
{
frame.setVisible(false);
System.exit(0);
}

public static void main(String args[])
{
Java_3 example=new Java_3();
//*********Found**********
example.____________;
}
}

[ay_changyafei]

高手们 把空给填完了 能告诉我是为什么吗？

谢谢了。 给点解析。。。 - -。 thanks。
格式如下：

试题解析：
【第一空】
参考答案：throws
解析：若是该方法中有异常的话，会直接抛出异常信息。

【第二空】
参考答案：readLine()
解析：逐行读取用户输入的信息。

【第三空】
参考答案：parseInt
解析：类型转换。将String类型转换为Integer。

[哀木落]

哇~~此图片来自qq空间

[Strive20101101]

我并不认为有多少人愿意花时间来读你的代码。

[smilebombht]

图相当于挂了