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📁 通过实例可以更好的了解java
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}

 


25-例子15（补充）
import javax.swing.*;
import javax.swing.text.*;
import java.awt.*;
class DigitDocumnet extends PlainDocument
{ public void insertString(int offset ,String s,AttributeSet a)
     {  char c=s.charAt(0);
      if ((c<='9'&&c>='0')||(c=='.'))
        { try {super.insertString(offset,s,a);}
         catch(BadLocationException e){}
        }
     }
}
public class DigitText extends JApplet
{ JTextField text=null;
  DigitDocumnet document=new DigitDocumnet();
   public void init()
    { text=new JTextField(30);
      Container con= getContentPane();
      con.setLayout(new FlowLayout());
      text.setDocument(document);
      con.add(text);
    }
}



25-例子16
import javax.swing.*;
import javax.swing.text.*;
import java.awt.*;
public class Example25_16 extends JApplet
{ JTextPane textpane;
   public void init()
  { textpane=new JTextPane();//创建文本窗格。
    getContentPane().add(textpane);
  } 
}



25-例子17
import javax.swing.*;import javax.swing.text.*;
import java.awt.*;
public class Example25_17 extends JApplet 
 { JTextPane textpane;
    MutableAttributeSet center_align,char_style;
 　 public void init()
    { textpane=new JTextPane();//创建文本窗格。
　　JScrollPane scroll=
new JScrollPane(textpane,JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
                                      JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
 　　center_align=new SimpleAttributeSet();
         char_style=new SimpleAttributeSet();  //创建属性对象。
         StyleConstants.setAlignment(center_align,StyleConstants.ALIGN_CENTER);
         StyleConstants.setFontFamily( char_style,"Serif");
         StyleConstants.setFontSize(char_style,70);
         StyleConstants.setForeground(char_style,Color.red);//为属性对象指定值
         textpane.setParagraphAttributes(center_align,true);//文本窗格设置文本的属性
         textpane.setCharacterAttributes(char_style,true);
         getContentPane().add(scroll);
    } 
}



25-例子18
import javax.swing.*;import javax.swing.text.*;
import java.awt.*;
public class Example25_18 extends JApplet 
{ JTextPane textpane;
   MutableAttributeSet center_align,char_style_1,char_style_2;
  public void init()
  { textpane=new JTextPane();//创建文本窗口
    JScrollPane scroll=new 
    JScrollPane(textpane,JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
    Document mydocument=textpane.getDocument();//初始化一个文档。
    center_align=new SimpleAttributeSet();
    char_style_1=new SimpleAttributeSet(); 
    char_style_2=new SimpleAttributeSet();  
StyleConstants.setAlignment(center_align,StyleConstants.ALIGN_CENTER);
    StyleConstants.setFontFamily( char_style_1,"Courier");
    StyleConstants.setFontSize(char_style_1,20);
    StyleConstants.setForeground(char_style_1,Color.red);
    StyleConstants.setFontFamily( char_style_2,"Serif");
    StyleConstants.setFontSize(char_style_2,14);
    StyleConstants.setForeground(char_style_2,Color.blue);
    textpane.setParagraphAttributes(center_align,true);
    textpane.setCharacterAttributes(char_style_1,true);
    try{textpane.insertIcon(new ImageIcon("a.jpg"));
   mydocument.insertString(mydocument.getLength(),
    "Lovely Apple\n",char_style_1);
       }
    catch(BadLocationException e)
        {} 
    textpane.setParagraphAttributes(center_align,true);
    textpane.setCharacterAttributes(char_style_2,true);
    try{mydocument.insertString(mydocument.getLength(),
    "I Want It\n",char_style_2);
        }
    catch(BadLocationException e)
        {} 
     getContentPane().add(scroll);
  } 
}



25-例子19
import javax.swing.*;
import javax.swing.text.*;
import java.awt.*;import java.io.*;
public class Example25_19 extends JApplet 
{ JTextPane textpane;FileInputStream readfile;
  public void init()
  { textpane=new JTextPane();//创建文本窗口
    JScrollPane scroll=new JScrollPane(textpane);
    try{ readfile=new FileInputStream("Example25_19.java");   
       }
    catch(IOException ee){}
     try{textpane.read(readfile,this);
        }
     catch(Exception e)
      {} 
     getContentPane().add(scroll);
  } 
}



25-例子20
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
class MyFileWin extends JFrame
{ JFileChooser chooser=new JFileChooser();
 MyFileWin()
   { super("有文件选择器的窗口");
     chooser.showDialog(null,"打开");
     setSize(200,200);
     setVisible(true);
     getContentPane().add(new Label("ok"));
     addWindowListener(new WindowAdapter()
     {public void windowClosing(WindowEvent e)
       { System.exit(0);}} );
   }
} 
public class Example25_20
{public static void main(String args[])
 {MyFileWin Win=new MyFileWin(); win.pack(); 
 }
}



25-例子21
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
class FileWin extends JFrame implements ActionListener
{ JButton button; JTextArea text;JTextPane textpane;FileInputStream readfile;
  JScrollPane scroll;Container con;
 JFileChooser chooser=new JFileChooser();
 FileWin()
   { super("有文件选择器的窗口");
     button=new JButton("打开文件选取器");
     button.addActionListener(this);
     textpane=new JTextPane();
     scroll=new JScrollPane(textpane);
     setSize(200,200);
     setVisible(true);
     addWindowListener(new WindowAdapter()
     {public void windowClosing(WindowEvent e)
       { System.exit(0);}} );
      con=getContentPane();con.add(button,BorderLayout.NORTH);
      con.add(scroll,BorderLayout.CENTER); 
   }
 public void actionPerformed(ActionEvent e)
  {if(e.getSource()==button)
    {String s;
     int state=chooser.showOpenDialog(null);
     File file=chooser.getSelectedFile();
     if(file!=null&&state==JFileChooser.APPROVE_OPTION)
     { try{
           readfile=new FileInputStream(file); //建立到文件的输入流。 
          }
       catch(IOException ee){}
       try{  textpane.read(readfile,this);//从流中读取数据。
           }
      catch(IOException e1){}
     }
    }
  }
} 
public class Example25_21
{public static void main(String args[])
 {FileWin Win=new FileWin(); Win.pack(); 
 }
}



25-例子21（补充）
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
class FileWin extends JFrame 
implements ActionListener
{ JButton button; 
  JScrollPane scroll;Container con;
 JFileChooser chooser=new JFileChooser();
 FileWin()
   { super("有文件选择器的窗口");
     button=new JButton("打开文件选取器");
     button.addActionListener(this);
     setSize(200,200);
     setVisible(true);
     addWindowListener(new WindowAdapter()
     {public void windowClosing(WindowEvent e)
       { System.exit(0);}} );
     con=getContentPane();con.add(button,BorderLayout.NORTH);
    }
 public void actionPerformed(ActionEvent e)
  {if(e.getSource()==button)
    {String s;
     int state=chooser.showOpenDialog(null);
     File file=chooser.getSelectedFile();
     if(file!=null&&state==JFileChooser.APPROVE_OPTION)
     {try{ Runtime ce=Runtime.getRuntime();
           ce.exec(file.toString());　 //把file用字符串表示
         }                          　　　　  //所有对象都能使用toString()。
      catch(IOException ee){}    
     }
    }
  }
}
public class mytest
{public static void main(String args[])
 {FileWin Win=new FileWin(); Win.pack();
  }
}



25-例子22
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class TimeWin extends JFrame implements ActionListener
{ static JTextArea text1,text2; Boy boy=new Boy();
   JScrollPane scroll_1,scroll_2;Container con;
   Timer time_1,time_2 ;   //声明2个计时器对象。
   JSplitPane splitpane;
 TimeWin()
   {super("有计时器窗口");
    time_1=new Timer(1000,this);//TimeWin对象做计时器的监视器。
    time_2=new Timer(2000,boy);//Boy对象做计时器的监视器。
    text1=new JTextArea(); text2=new JTextArea();
    scroll_1=new JScrollPane(text1);
    scroll_2=new JScrollPane(text2);
    splitpane=new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,scroll_1,
                          scroll_2);
    setSize(200,200);
    setVisible(true);
    con=getContentPane();con.add(splitpane);
    time_1.start();time_2.start();//启动计时器。
    addWindowListener(new WindowAdapter()
     {public void windowClosing(WindowEvent e)
       { System.exit(0);}} );
   }
  public void actionPerformed(ActionEvent e)
  {text1.append("欢迎光临！"+"\n"); }
} 
class Boy implements ActionListener
{ public void actionPerformed(ActionEvent e)
  { TimeWin.text2.append("再见！"+"\n");  }
}
public class Example25_22
{public static void main(String args[])
 {TimeWin Win=new TimeWin(); Win.pack();
  }
}



25-例子23
import javax.swing.*;import java.awt.*;
import java.awt.event.*;
class BarWin extends JFrame implements ActionListener
{  Timer time_1;  int sum=0,i=1;
   JProgressBar p_bar;Container con;
 BarWin()
   {super("窗口");
    time_1=new Timer(1000,this);//TimeWin对象做计时器的监视器，每
                                      　　　　 //1000毫秒震铃一次。
    p_bar=new JProgressBar(0,55); 
    p_bar.setBackground(Color.white);
    p_bar.setStringPainted(true);
    setSize(200,200);
    setVisible(true);
    con=getContentPane();con.add(p_bar,BorderLayout.NORTH);
    time_1.start();
    addWindowListener(new WindowAdapter()
     {public void windowClosing(WindowEvent e)
       { System.exit(0);}} );
     }
  public void actionPerformed(ActionEvent e)
  {  sum=sum+i; 
     p_bar.setValue(sum);//吃掉sum/55
     i=i+1;
     if(sum>=55)
     time_1.stop();
  }
} 
public class Example25_23
{public static void main(String args[])
 {BarWin Win=new BarWin(); Win.pack();
  }
}



25-例子24
import javax.swing.*;import java.awt.*;
import java.awt.event.*;
public class Example25_24 extends JApplet implements ActionListener
{  static  Timer time_1;  static JButton   button1,button2;int i=1;
   JProgressBar p_bar;Container con;JLabel label;
   public void init()
   {time_1=new Timer(1000,this);
    p_bar=new JProgressBar(0,33); 
    p_bar.setBackground(Color.white);
    con=getContentPane();con.add(p_bar,BorderLayout.NORTH);
    button1=new JButton("开始播放");button2=new JButton("停止播放");
    p_bar.setStringPainted(true);  p_bar.setString("正在播放第0张");
    button1.addActionListener(new Boy()); button2.addActionListener(new Boy());
    JPanel panel=new JPanel();
    panel.add(button1); panel.add(button2); label=new JLabel();
    con.add(label,BorderLayout.CENTER); con.add(p_bar,BorderLayout.NORTH);
    con.add(panel,BorderLayout.SOUTH);
   }
  public void actionPerformed(ActionEvent e)
  {  label.setIcon(new ImageIcon("tom"+i+".jpg"));
     p_bar.setValue(i);p_bar.setString("正在播放第"+i+"张,共33张");
     i++; 
     if(i>33) {time_1.stop();i=1;}
  }
} 
class Boy implements ActionListener
{  public void actionPerformed(ActionEvent e)
  { if(e.getSource()==Example25_24.button1)
     Example25_24.time_1.start();
    else if(e.getSource()==Example25_24.button2)
     Example25_24.time_1.stop();
  }
}



25-例子25
import javax.swing.*;
public class Example25_25 extends JApplet
{ JTable table;
   public  void init()
 { table=new JTable(4,6);
   getContentPane().add(new JScrollPane(table));
 } 
}



25-例子26
import javax.swing.*;import java.awt.*;
import java.awt.event.*;
public class Example25_26 extends JApplet implements ActionListener
{ JTable table;Object a[][];JPanel p1,p2;
  Object name[]={"第1列","第2列"};
  JButton button;JTextField text;
   public  void init()
 { a=new Object[2][2];
   button=new JButton("确定");text=new JTextField(8);
   p1=new JPanel();p2=new JPanel();
   p1.setLayout(new GridLayout(2,1));
   p1.add(new Label("输入2阶行列式的元素"));
   p1.add(new Label("输入或修改数据后，用鼠标点击每个格，使数据生效"));
   p2.add(button);p2.add(new JLabel("结果:"));p2.add(text); 
   table=new JTable(a,name);
   button.addActionListener(this);
   getContentPane().add(new JScrollPane(table),BorderLayout.CENTER);
   getContentPane().add(p1,BorderLayout.NORTH);
   getContentPane().add(p2,BorderLayout.SOUTH);
 } 
 public void actionPerformed(ActionEvent e)
 {if(e.getSource()==button)
  { double d[][]=new double[2][2];double result;
    for(int i=0;i<2;i++)
     {for(int j=0;j<2;j++)
        {d[i][j]=Double.valueOf(a[i][j].toString()).doubleValue();
        }//将对象a[i][j]表示为字符串后,，再转化为double型数值
     }
    result=d[1][1]*d[0][0]-d[0][1]*d[1][0];
    text.setText(String.valueOf(result)); 
    }
 }
} 



25-例子27
import javax.swing.*;
import java.awt.event.*;
import java.sql.*;
import java.awt.*;
 class ResultWin extends JFrame implements ActionListener
{  Object a[][];
   Object columnName[]={"学号","姓名","出生日期","数学","物理","英语"}; 
   JTable table;JButton button;
   Container container; 
   String name,xuehao;Date date; int math,physics,english;
   Connection con;Statement sql; ResultSet rs; 
   JProgressBar p_bar; 
  ResultWin()
  {  super("数据查询");
💿 文件大小 88 K
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