66 lines
1.8 KiB
Java
66 lines
1.8 KiB
Java
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Printing an unsigned integer in bits
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import java.awt.*;
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import java.awt.event.*;
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import javax.swing.*;
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public class PrintBits extends JFrame
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{
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public PrintBits()
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{
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super( "Printing bit representations for numbers" );
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Container c = getContentPane();
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c.setLayout( new FlowLayout() );
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c.add( new JLabel( "Enter an integer " ) );
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final JTextField output = new JTextField( 33 );
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JTextField input = new JTextField( 10 );
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input.addActionListener( new ActionListener()
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{
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public void actionPerformed( ActionEvent e )
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{
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int val = Integer.parseInt( e.getActionCommand() );
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output.setText( getBits( val ) );
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}
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});
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c.add( input );
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c.add( new JLabel( "The integer in bits is" ) );
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output.setEditable( false );
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c.add( output );
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setSize( 720, 70 );
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show();
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}
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private String getBits( int value )
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{
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int displayMask = 1 << 31;
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StringBuffer buf = new StringBuffer( 35 );
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for ( int c = 1; c <= 32; c++ )
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{
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buf.append( ( value & displayMask ) == 0 ? '0' : '1' );
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value <<= 1;
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if ( c % 8 == 0 )
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buf.append( ' ' );
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}
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return buf.toString();
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}
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public static void main( String args[] )
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{
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PrintBits app = new PrintBits();
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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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