97 lines
3.2 KiB
Java
97 lines
3.2 KiB
Java
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Demonstrating the File class
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import java.awt.*;
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import java.awt.event.*;
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import java.io.*;
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import javax.swing.*;
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public class FileTest extends JFrame implements ActionListener
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{
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private JTextField enter;
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private JTextArea output;
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public FileTest()
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{
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super( "Testing class File" );
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enter = new JTextField( "Enter file or directory name here" );
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enter.addActionListener( this );
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output = new JTextArea();
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Container c = getContentPane();
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ScrollPane p = new ScrollPane();
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p.add( output );
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c.add( enter, BorderLayout.NORTH );
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c.add( p, BorderLayout.CENTER );
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setSize( 400, 400 );
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show();
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}
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public void actionPerformed( ActionEvent e )
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{
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File name = new File( e.getActionCommand() );
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if ( name.exists() )
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{
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output.setText( name.getName() + " exists\n" + ( name.isFile() ? "is a file\n" :
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"is not a file\n" ) +
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( name.isDirectory() ? "is a directory\n" :
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"is not a directory\n" ) +
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( name.isAbsolute() ? "is absolute path\n" :
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"is not absolute path\n" ) +
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"Last modified: " + name.lastModified() +
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"\nLength: " + name.length() +
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"\nPath: " + name.getPath() +
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"\nAbsolute path: " + name.getAbsolutePath() +
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"\nParent: " + name.getParent() );
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if ( name.isFile() )
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{
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try
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{
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RandomAccessFile r = new RandomAccessFile( name, "r" );
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StringBuffer buf = new StringBuffer();
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String text;
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output.append( "\n\n" );
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while( ( text = r.readLine() ) != null )
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buf.append( text + "\n" );
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output.append( buf.toString() );
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}
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catch( IOException e2 )
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{
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JOptionPane.showMessageDialog( this, "FILE ERROR",
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"FILE ERROR", JOptionPane.ERROR_MESSAGE );
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}
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}
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else if ( name.isDirectory() )
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{
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String directory[] = name.list();
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output.append( "\n\nDirectory contents:\n");
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for ( int i = 0; i < directory.length; i++ )
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output.append( directory[ i ] + "\n" );
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}
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}
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else
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{
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JOptionPane.showMessageDialog( this, e.getActionCommand() + " Does Not Exist",
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"FILE ERROR", JOptionPane.ERROR_MESSAGE );
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}
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}
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public static void main( String args[] )
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{
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FileTest app = new FileTest();
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app.addWindowListener( new WindowAdapter()
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{
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public void windowClosing( WindowEvent e )
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{
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System.exit( 0 );
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}
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} );
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}
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}
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