Result Of Encoded Message Cannot Restore To Original Message By Decoder

Sep 28, 2014

The problem is the result of encoded message can't not restore to the original message by the decoder. Here are my three class's code

SecureMsgMain:

package securemsg.core;
 
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Scanner;
 import securemsg.database.*;
 public class SecureMsgMain {
 
[Code] .....

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Decoder Ring - Prompt User For A Message To Decode

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So it is the question: This program implements a simple "decoder ring". It will prompt the user for a message to decode and decode the message based on the following substitution rules:

ABCDEFGHIJKLMNOPQRSTUVWXYZ will map to
ZEBRASCDFGHIJKLMNOPQTUVWXY

abcdefghijklmnopqrstuvwxyz will also map to
ZEBRASCDFGHIJKLMNOPQTUVWXY

any other characters (like space, punctuation, will map to themselves)

so if it sees an 'A' (or an 'a'), it will map to 'Z', etc... All i could think of is this but can't figure out the rest.

import java.util.Scanner;
public class DecoderRing
{
public static void main(String[] args)
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String1[] = 'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z';
String2[] = 'Z','E','B','R','A','S','C','D','F','G','H','I','J','K','L','M','N','O','P','Q','T','U','V','W','X','Y';
}
}

Not sure, what things are necessary such as switch statements or if and else or for loops and such...

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import java.awt.*;
import javax.swing.*;
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{
private JList friends;
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[code]...

1. Open the source code file of your InstantMessageFrame class from Lab 12.2.

2. Add the following three fields to the InstantMessageFrame class: a JTextField named message, a JList named friends, and a JButton named send.

3. Add a method to your InstantMessageFrame class named getMessagePanel()that returns a JPanel and has no parameters. (This method will create a JPanel that will appear in the south border of your JFrame. It will contain a text field in which a message can be entered and a button that sends an instant message to all the friends in the list.)

4. Within getMessagePanel(), instantiate a new JPanel and give it BorderLayout.Assign a message equal to a new JTextField by using the no-argument constructor of JTextField. Assign send to a new JButton,passing in "Send" to the constructor. (This will be the label on the button.)

5. Within getMessagePanel(), add the message text field to the center of the JPanel and add the send button to the east border of the JPanel. The panel is now ready, so return the JPanel reference.

6. Add a method to your InstantMessageFrame class named get-FriendsPane() that returns a JScrollPane and has no parameters.(This method will create a scrollable list that will contain the names of others that you can chat with.)

7. Within getFriendsPane(), assign friends to a new JList by using theno-argument constructor of JList.

8. Within getFriendsPane(), instantiate a new JScrollPane using the following statement: JScrollPane pane = new JScrollPane(friends);

9. The scroll pane is ready, so return the reference pane at the end of getFriendsPane().

10. Within the constructor of InstantMessageFrame, invoke getMessagePanel(),placing the returned panel in the south border of the content pane of InstantMessageFrame.An Introduction to GUI Programming 399

11. Within the constructor of InstantMessageFrame, invoke get-FriendsPane(), placing the returned scroll pane in the center of the content pane of InstantMessageFrame.

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^
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Server

public class Server implements Runnable{
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HashMap<Short,Socket> clients;
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[code]....

Both are startet in seperate threads. At the moment the first output of the client is "12 bytes read", and then continously "-1 bytes read"(because the server closes).

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[Code]...

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