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JBuilder: How to convert Decmial to Binary part 2
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How to convert Decmial to Binary part 2 Turn on/off line numbers in source code. Switch to Orginial background IDE or DSP color Comment or reply to this aritlce/tip for discussion. Bookmark this article to my favorite article(s). Print this article
Convert Decimal to Binary part 2 19-Jun-05
Category
Algorithm
Language
JBuilder All Versions
Views
344
User Rating
9
# Votes
1
Replies
0
Publisher:
Harrington, Mark
Reference URL:
			1   
2   import java.awt.*;
3   import java.awt.event.*;
4   /* 
5    The idea behind this exorcise is aimed at teaching the crude fundamentals of
6    signed binary notation with a basic insight in mind as to what happens when
7    you don't designate correct containership for number representation
8    particularly important when writing math's classes or doing any programming
9    with regard to calculations of some sort. This is possibly the most critical 
10   part of programming that people tend to forget and can be very costly at the 
11   end of it especially if you are writing applications for a company 
12  
13   Written By MD Harrington Friday, 17 June 2005  */
14  
15  
16  class ConvertIntegerToBin extends Frame implements KeyListener
17  {
18  
19  private TextField numb1, result, TChar ;
20  private Label LB1,LB2,LB3 ;
21  private IntegerToBinary myint; // The InetegertoBinary class that
22                                // deals with our conversion 
23  private Panel p1,p2,p3; // panels for  for adding components to 
24  
25          public ConvertIntegerToBin()
26          {
27  
28            super("Mark's 32 bit Signed Binary Converter");
29            this.addWindowListener(new WindowAdapter(){
30            // add windowlistener so we can close the window
31                    public void windowClosing(WindowEvent e)
32                    {close();}
33            });
34  
35         // use grid Layout 4 rows 1 column vertical and horizontal spacing of 10
36            this.setLayout(new GridLayout(4,1,10,10));
37            numb1 = new TextField(20); 
38            TChar = new TextField(3);
39            TChar.setForeground(new Color(255,0,0));
40            numb1.addKeyListener(this); // key listener listens for the enter key
41            result = new TextField(32);
42            // create 3 labels to indicate what we are doing here
43            LB1 = new Label("Enter an Integer");
44            LB2 = new Label("32 Bit Signed Representation");
45            LB3 = new Label("Character Representation");
46  
47         // create 3 panels to hold our components such as labels text boxes etc 
48            p1 = new Panel();
49            p2 = new Panel();
50            p3 = new Panel();
51  
52   // set the layout for each panel such that we can space the Components neatly
53  
54            p3.setLayout(new BorderLayout());
55            p1.setLayout(new BorderLayout());
56            p1.add("West", LB1);
57            p1.add("Center",numb1);
58            p2.add("Center",LB2);
59            p3.add("West",LB3);
60            p3.add("Center",TChar);
61  
62            add("Center",p1);
63            add("Center",p3);
64            add("Center",p2);
65            add("Center",result);
66            // initialise the size of the window to width 300 height 145
67            this.setSize(300,145);
68        // don't want to be able to maximise Frame so set re sizeable to false
69            this.setResizable(false); 
70  
71   // you might like to play with this to get best startup position on the screen 
72  
73            this.setLocation(200,200);
74  
75            this.show();
76  
77          }
78  
79  
80          /* close method which is invoked when calling destroy 
81          window method handled by WindowEvent Listener */
82  
83          public void close()
84          {
85           hide();
86           dispose();
87           System.exit(1);
88          }
89  
90  /* key event Listener handles all key input to text fields */
91  
92  public void keyTyped(KeyEvent e)
93  {
94  
95          if(e.getKeyChar() == KeyEvent.VK_ENTER)
96          {
97                  myint = new IntegerToBinary(Integer.parseInt(numb1.getText()));
98                  result.setText(myint.getBits());
99                  char myChar = (char)Integer.parseInt(numb1.getText());
100                 TChar.setText(myChar+"");
101         }
102 
103 }// end keyevent 
104 
105 
106 // not used 
107 
108 //We have to declare these methods since we are implementing an abstract class
109 
110 public void keyPressed(KeyEvent e){}
111 public void keyReleased(KeyEvent e){}
112 
113 
114 
115 
116         public static void main(String[] args) 
117         {
118                 ConvertIntegerToBin object = new ConvertIntegerToBin();
119         }
120 }


			
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