Implementing the DecryptScreen class

This screen displays the decrypted plaintext message.

To create the class:

1. Assign the class to the package satsa and import the required classes.

   package satsa;
   
   import javax.microedition.lcdui.Command;
   import javax.microedition.lcdui.CommandListener;
   import javax.microedition.lcdui.Displayable;
   import javax.microedition.lcdui.Form;
   import javax.microedition.lcdui.StringItem;

2. Create the class by extending Form and implementing CommandListener.

   class DecryptScreen
     extends Form
     implements CommandListener
   {
     private final SATSAMIDlet midlet;
     private final Command commandBack =
       new Command("Back", Command.BACK, 1);
     private int index;
     private String decryptedMessage;
   
     DecryptScreen(SATSAMIDlet midlet)
     {
       super(null);
   
       this.midlet = midlet;
       createForm();
     }
   
     public void commandAction(Command c, Displayable d)
     {
       if (c==commandBack)
       {
         midlet.showEncryptedMessage(index);
       }
     }
     
     void setIndex(int index)
     {
       this.index = index;
     }
   
     void setMessage(String decryptedMessage)
     {
       this.decryptedMessage = decryptedMessage.trim();
       createForm();
     }
   
     private void createForm()
     {
       deleteAll();
       setTitle("Decrypted Message ");
       StringItem messageItem = new StringItem(null, decryptedMessage);
       append(messageItem);
       addCommand(commandBack);
       setCommandListener(this);
     }
   }