105 lines
3.1 KiB
Java
105 lines
3.1 KiB
Java
Using the bitwise shift operators
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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 BitShift extends JFrame
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{
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public BitShift()
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{
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super( "Shifting bits" );
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Container c = getContentPane();
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c.setLayout( new FlowLayout() );
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final JTextField bits = new JTextField( 33 );
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c.add( new JLabel( "Integer to shift " ) );
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final JTextField value = new JTextField( 12 );
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value.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( value.getText() );
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bits.setText( getBits( val ) );
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}
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} );
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c.add( value );
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bits.setEditable( false );
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c.add( bits );
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JButton left = new JButton( "<<" );
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left.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( value.getText() );
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val <<= 1;
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value.setText( Integer.toString( val ) );
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bits.setText( getBits( val ) );
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}
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} );
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c.add( left );
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JButton rightSign = new JButton( ">>" );
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rightSign.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( value.getText() );
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val >>= 1;
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value.setText( Integer.toString( val ) );
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bits.setText( getBits( val ) );
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}
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} );
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c.add( rightSign );
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JButton rightZero = new JButton( ">>>" );
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rightZero.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( value.getText() );
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val >>>= 1;
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value.setText( Integer.toString( val ) );
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bits.setText( getBits( val ) );
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}
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} );
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c.add( rightZero );
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setSize( 400, 120 );
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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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BitShift app = new BitShift();
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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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