Text of 5th laboratory

Текст программы 5 лабораторной работы

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

public class Calculator extends Applet
 { 
  public void init()
   {
    setLayout(new BorderLayout());
    Calculation Calc = new Calculation();
    add("Center",Calc);
   }
 }

/* ActionListener   интерфейс слушателя
   actionPerformed  метод слушателя
   ActionEvent      порождаемое событие
*/
class ProCalculator implements ActionListener
 { 
  private static String num_str = "";
  private static String operation = null;
  private static long num = 0; 
  private static long accum = 0;
  private static int flag = 0;
  public void actionPerformed(ActionEvent e)
   {  
    String str = e.getActionCommand();
    if((Character.isDigit(str.charAt(0))) 
       ||(str=="A")||(str=="B")
       ||(str=="C")||(str=="D")
       ||(str=="E")||(str=="F"))
     {
      num_str += str;
      Calculation.io.setText(num_str);
     }
    else
     {
      if(num_str.length() >= 1)
       {
        System.out.println("num_str = "+num_str);
        try
         {
          num = Long.parseLong(num_str,16);
         } 
        catch(Exception q)
         {
          System.out.println("Found Exception!"+q);  
         }
        num_str = "";
        if(operation != null)
         {
          Calculation.io.setText("");
          switch(operation.charAt(0))
           {
            case '+': accum += num; break;
            case '-': accum -= num; break;
            case '*': accum *= num; break;
            case '/': accum /= num; break;
           }
         }
        else
         {
          accum = num;
         }
        Calculation.io.setText("");
        operation = str;
       }
      if(str.equals("="))
       {
        String s = Long.toString(accum,16);
        Calculation.io.setText(s.toUpperCase());
        operation = null;
       }
      if(str.equals("CE"))
       {
        num_str = "";
        operation = null;
        num = 0;
        accum = 0;
        String s = Long.toString(accum);
        Calculation.io.setText(s);
       }
      if(flag==1)
       {
        Calculation.io.setText("");
        operation = str;
        flag = 0;
        num = accum;
       }
     }
   }
}

class Calculation extends Panel
 {
  ProCalculator pc;
  Calculation()
   {
    pc = new ProCalculator();
    DrawCalc(pc); 
   }
  public static TextField io = null;
  public boolean keyDown(Event evt,int key)
   {
    key = key - 48;
    String st = Integer.toString(key);
           System.out.println(key);   
    return true;
   }
   private void DrawCalc(ProCalculator dc)
    {
     io = new TextField(30);
     io.setEditable(false); 
     io.setBackground(Color.green);
     io.setForeground(Color.black);
     GridBagConstraints gbc = new GridBagConstraints();
     setLayout(new GridBagLayout());
     gbc.insets = new Insets(2,2,2,2);
     gbc.gridx = 0;
     gbc.gridy = 0;
     gbc.gridwidth = 10;
     gbc.anchor = GridBagConstraints.CENTER;
   
     Panel buttonPanel=new Panel();
     Panel textPanel = new Panel();

     buttonPanel.setLayout(new GridLayout(4,6));
     ProCalculator buttonListener = new ProCalculator();

     Button b1 = new Button("7"); 
     b1.addActionListener(buttonListener);
     buttonPanel.add(b1);

     Button b2 = new Button("8"); 
     b2.addActionListener(buttonListener);
     buttonPanel.add(b2);

     Button b3 = new Button("9"); 
     b3.addActionListener(buttonListener);
     buttonPanel.add(b3);

     Button b4 = new Button("/"); 
     b4.addActionListener(buttonListener);
     buttonPanel.add(b4);

     Button b5 = new Button("A"); 
     b5.addActionListener(buttonListener);
     buttonPanel.add(b5);

     Button b6 = new Button("CE"); 
     b6.addActionListener(buttonListener);
     buttonPanel.add(b6);

     Button b7 = new Button("4"); 
     b7.addActionListener(buttonListener);
     buttonPanel.add(b7);

     Button b8 = new Button("5"); 
     b8.addActionListener(buttonListener);
     buttonPanel.add(b8);

     Button b9 = new Button("6"); 
     b9.addActionListener(buttonListener);
     buttonPanel.add(b9);

     Button b10 = new Button("*"); 
     b10.addActionListener(buttonListener);
     buttonPanel.add(b10);

     Button b11 = new Button("B"); 
     b11.addActionListener(buttonListener);
     buttonPanel.add(b11);

     Button b12 = new Button("E"); 
     b12.addActionListener(buttonListener);
     buttonPanel.add(b12);

     Button b13 = new Button("1"); 
     b13.addActionListener(buttonListener);
     buttonPanel.add(b13);

     Button b14 = new Button("2"); 
     b14.addActionListener(buttonListener);
     buttonPanel.add(b14);

     Button b15 = new Button("3"); 
     b15.addActionListener(buttonListener);
     buttonPanel.add(b15);

     Button b16 = new Button("-"); 
     b16.addActionListener(buttonListener);
     buttonPanel.add(b16);

     Button b17 = new Button("C"); 
     b17.addActionListener(buttonListener);
     buttonPanel.add(b17);

     Button b18 = new Button("F"); 
     b18.addActionListener(buttonListener);
     buttonPanel.add(b18);

     Button b19 = new Button("0"); 
     b19.addActionListener(buttonListener);
     buttonPanel.add(b19);

//     Button b20 = new Button("+/-"); 
//     b20.addActionListener(buttonListener);
//     buttonPanel.add(b20);

     Button b20 = new Button("."); 
     b20.addActionListener(buttonListener);
     buttonPanel.add(b20);

     Button b21 = new Button("="); 
     b21.addActionListener(buttonListener);
     buttonPanel.add(b21);

     Button b22 = new Button("+"); 
     b22.addActionListener(buttonListener);
     buttonPanel.add(b22);

     Button b23 = new Button("D"); 
     b23.addActionListener(buttonListener);
     buttonPanel.add(b23);


     textPanel.add(io,gbc);
     setLayout(new BorderLayout());
     add("North", textPanel);
     add("Center",buttonPanel);
    }
}      
<br>
<br>

<hr width=750 size=1 color=#B1B1B1>

<!--<div align="center"> -->
<center>
<table border="0" cellspacing="2">
 <tr align="center" valign="middle"> 
            <td>
<!-- BEGIN OF PING CODE v5.1 -->
<script language="javascript">//<!--
id="112802155341";img="count30";script="http://counter.topping.com.ua:80/cgi-bin/pinger.cgi";d=document;an=navigator.appName;rf=escape(d.referrer);w="";c="";jv="0";je="u";//-->
</script>
<script language="javascript1.1">//<!--
jv="1";je = (navigator.javaEnabled()?"y":"n");//-->
</script>
<script language="javascript1.2">//<!--
s=screen;w=s.width;an!="Netscape"?c=s.colorDepth:c=s.pixelDepth;jv="2";//-->
</script>
<script language="javascript1.3">//<!--
jv="3";//-->
</script>
<script language="javascript">//<!--
pi="";pi+="\""+script+"?id="+id+"&img="+img+"&w="+w+"&c="+c+"&ref="+rf+"&jsv="+jv+"&jen="+je+"\"";pi="<a href=http://www.topping.com.ua/ target=_blank><img src="+pi+" width=88 height=31 border=0 alt=\"Rated by PING\"></a>";d.write(pi);//-->
</script>
<noscript>
<a href=http://www.topping.com.ua/ target=_blank><img src=http://counter.topping.com.ua:80/cgi-bin/ping.cgi?112802155341;count30 width=88 height=31 border=0 alt="Rated by PING"></a>
</noscript>
<!-- END OF PING CODE v5.1 -->
            
            </td>
            <td rowspan=2>
<!--begin of Top100-->
<a href="http://top100.rambler.ru/top100/"><img src="http://counter.rambler.ru/top100.cnt?1030231" alt="Rambler's Top100" width=81 height=63 border=0></a>
<!--end of Top100 code--> 
            </td>
<td>
<!--Rating@Mail.ru counter-->
<script language="javascript"><!--
d=document;var a='';a+=';r='+escape(d.referrer);js=10;//--></script>
<script language="javascript1.1"><!--
a+=';j='+navigator.javaEnabled();js=11;//--></script>
<script language="javascript1.2"><!--
s=screen;a+=';s='+s.width+'*'+s.height;
a+=';d='+(s.colorDepth?s.colorDepth:s.pixelDepth);js=12;//--></script>
<script language="javascript1.3"><!--
js=13;//--></script><script language="javascript" type="text/javascript"><!--
d.write('<a href="http://top.mail.ru/jump?from=407990" target="_top">'+
'<img src="http://d9.c3.b6.a0.top.mail.ru/counter?id=407990;t=56;js='+js+
a+';rand='+Math.random()+'" alt="Р РµР№С‚РёРЅРі@Mail.ru" border="0" '+
'height="31" width="88"><\/a>');if(11<js)d.write('<'+'!-- ');//--></script>
<noscript><a target="_top" href="http://top.mail.ru/jump?from=407990">
<img src="http://d9.c3.b6.a0.top.mail.ru/counter?js=na;id=407990;t=56" 
height="31" width="88" border="0" alt="Р РµР№С‚РёРЅРі@Mail.ru"></a></noscript>
<script language="javascript" type="text/javascript"><!--
if(11<js)d.write('--'+'>');//--></script>
<!--// Rating@Mail.ru counter-->

</td>
          </tr>
          <tr align="center" valign="middle"> 
            <td>
<!-- bigmir)net TOP 100 --><a href=http://www.bigmir.net/?cl=38404 target=_blank><script language="javascript"><!--
bmQ='<img src=http://c.bigmir.net/?s38404&t5'
bmD=document
bmD.cookie="b=b"
if(bmD.cookie)bmQ+='&c1'
//--></script><script language="javascript1.2"><!-- 
bmS=screen;bmQ+='&d'+(bmS.colorDepth?bmS.colorDepth:bmS.pixelDepth)+"&r"+bmS.width;
//--></script><script language="javascript"><!--
bmF = bmD.referrer.slice(7);
((bmI=bmF.indexOf('/'))!=-1)?(bmF=bmF.substring(0,bmI)):(bmI=bmF.length);
if(bmF!=window.location.href.substring(7,7+bmI))bmQ+='&f'+escape(bmD.referrer);
bmD.write(bmQ+" border=0 width=88 height=31 alt='bigmir TOP100'>");
//--></script></a>
            
            </td>
	<td>
<!--Openstat--><span id="openstat2124156"></span><script type="text/javascript">
var openstat = { counter: 2124156, image: 5045, next: openstat }; document.write(unescape("%3Cscript%20src=%22http" +
(("https:" == document.location.protocol) ? "s" : "") +
"://openstat.net/cnt.js%22%20defer=%22defer%22%3E%3C/script%3E"));
</script><!--/Openstat-->
</td>
          </tr>
</table>
<!-- </div>
 -->