Source to BitShiftAp  Applet, just a front end to the BitShift class

/* Marcus Green November 1999 BitShiftApp.java demonstration of 
the process of the Java Bit shifting operands << >> >>. Part of 
Marcus Greens Java Programmer Certification resources to be found at 
http://www.software.u-net.com. mail@marcusgreen.co.uk. This file is the 
interface component to be used with BitShift.java that does the actual 
processing of the bits 
*/ 

import java.awt.*; 
import java.awt.event.*; 
import java.applet.*; 
  

public class BitShiftAp extends Applet { 
  String ShiftType=""; 
  int[] mybits = new int[32]; 
  TextField txtInputValue   =new TextField(32); 
  Panel ButtonPanel  = new Panel(); 
  Button LeftShift = new Button("<<"); 
  Button RightShift = new Button(">>"); 
  TextField txtPlaceCount = new TextField(4); 
  Panel pnlInputValue = new Panel(); 
  Panel pnlBinaryVersion = new Panel(); 
  GridLayout gridLayout1 = new GridLayout(4,2); 
  Label lblNumberToShift = new Label(); 
  FlowLayout flowLayout1 = new FlowLayout(); 
  Label lblBinaryVersion = new Label(); 
  TextField txtBinBeforeShift = new TextField(33); 
  Panel pnlShiftedVersion = new Panel(); 
  Label lblShiftedVersion = new Label(); 
  TextField txtBinAfterShift = new TextField(33); 
  Label lblNumberOfPlaces = new Label(); 
  Button btnUnsignedRight = new Button(); 
  Panel pnlShiftedDecVersion = new Panel(); 
  Label lblShiftedDecVersion = new Label("Shifted Decimal Version"); 
  TextField txtDecAfterShift = new TextField(29); 
  FlowLayout flowLayout2 = new FlowLayout(); 

  //Construct the applet 

  public BitShiftAp() { 
  } 
//Initialize the applet 

  public void init() { 
    try { 
    jbInit(); 
        //txtInputValue.setSelectionStart(30); 
    } 
    catch (Exception e) { 
    e.printStackTrace(); 
    } 
  } 
  

  private void jbInit() throws Exception { 

      setLayout(gridLayout1); 
      this.setLayout(gridLayout1); 
    this.setBackground(Color.pink); 
    //this.setSize(new Dimension(400, 295)); 
      //txtInputValue.setSelectionStart(33); 

    RightShift.addMouseListener(new java.awt.event.MouseAdapter() { 
      public void mouseClicked(MouseEvent e) { 
        RightShift_mouseClicked(e); 
      } 
    }); 
    LeftShift.addMouseListener(new java.awt.event.MouseAdapter() { 
      public void mouseClicked(MouseEvent e) { 
        LeftShift_mouseClicked(e); 
      } 
    }); 

    pnlBinaryVersion.setLayout(flowLayout2); 
    gridLayout1.setRows(6); 
    lblNumberToShift.setText("Number to Shift"); 
    lblBinaryVersion.setText("Binary Version"); 
    lblShiftedVersion.setText("Shifted Version"); 
    lblNumberOfPlaces.setText("Number of Places"); 
    btnUnsignedRight.setLabel(">>>"); 

    btnUnsignedRight.addMouseListener(new java.awt.event.MouseAdapter() { 
      public void mouseClicked(MouseEvent e) { 
        btnUnsignedRight_mouseClicked(e); 
      } 
    }); 
    add(ButtonPanel); 
    ButtonPanel.add(btnUnsignedRight, null); 
    ButtonPanel.add(LeftShift); 
    ButtonPanel.add(RightShift); 
    ButtonPanel.add(lblNumberOfPlaces, null); 
    ButtonPanel.add(txtPlaceCount); 
    this.add(pnlInputValue); 
    pnlInputValue.add(lblNumberToShift, null); 
    pnlInputValue.add(txtInputValue, null); 
    add(pnlBinaryVersion); 
    pnlBinaryVersion.add(lblBinaryVersion, null); 
    pnlBinaryVersion.add(txtBinBeforeShift, null); 
    this.add(pnlShiftedVersion, null); 
    pnlShiftedVersion.add(lblShiftedVersion, null); 
    pnlShiftedVersion.add(txtBinAfterShift, null); 
    add(pnlShiftedDecVersion); 
    pnlShiftedDecVersion.add(lblShiftedDecVersion); 
    pnlShiftedDecVersion.add(txtDecAfterShift, null); 
  } 
//Get Applet information 

  public String getAppletInfo() { 
    return "Applet Information"; 
  } 
//Get parameter info 

  public String[][] getParameterInfo() { 
    return null; 
  } 

  void RightShift_mouseClicked(MouseEvent e) { 
    String sPlaceCount; 
    sPlaceCount = txtPlaceCount.getText(); 
   if(sPlaceCount.equals("")){ 
    showStatus("Please enter the number of places to shift"); 
    }else 
    { 
    doShift(">>"); 
    } 

  } 

  public void doShift(String sShiftType){ 
       String sBeforeShift=""; 
       String sAfterShift=""; 

       int iInputValue=0, iPlaceNo=0; 
       iInputValue=  Integer.parseInt(txtInputValue.getText().trim()); 
       int iPlaces=  Integer.parseInt(txtPlaceCount.getText().trim()); 

       BitShift bs = new BitShift(); 
       txtBinBeforeShift.setText(bs.getBitString(iInputValue )); 
       txtBinAfterShift.setText((bs.doShift(iPlaces,iInputValue,sShiftType))); 
       txtDecAfterShift.setText(new Integer(bs.getShifted()).toString()); 

  } 

  void LeftShift_mouseClicked(MouseEvent e) { 
   String sPlaceCount; 
    sPlaceCount = txtPlaceCount.getText(); 
   if(sPlaceCount.equals("")){ 
         showStatus("Please enter the number of places to shift"); 
      }else 
      { 
      doShift("<<"); 
      } 
   } 

  void btnUnsignedRight_mouseClicked(MouseEvent e) { 
    String sPlaceCount; 
    sPlaceCount = txtPlaceCount.getText(); 
   if(sPlaceCount.equals("")){ 
         showStatus("Please enter the number of places to shift"); 
      }else 
   { 
      doShift(">>>"); 
     } 
  } 
  
  
  
  

  }