Modify the MessageWindow program below so that the user enters the entire messag

Question

Modify the MessageWindow program below so that the user enters the entire message as a single string, with backslashes used to indicate which words go on each line:

Enter font name: Serif
Enter font size: 40
Enter message: I'm the/king of the/world!

There can be any number of backslashes in the message, including none.

Please give single line comment containing explanation next to the lines modified.

//////////////////////////////////////////////////////////////
// From JAVA PROGRAMMING: FROM THE BEGINNING, by K. N. King //
// Copyright (c) 2000 W. W. Norton & Company, Inc. //
// All rights reserved. //
// This program may be freely distributed for class use, //
// provided that this copyright notice is retained. //
// //
// MessageWindow.java (Chapter 6, page 244) //
//////////////////////////////////////////////////////////////

// Program name: MessageWindow
// Author: K. N. King
// Written: 1999-04-04
//
// Displays a message within a frame. Prompts the user to
// enter a font name and size, the number of lines in the
// message, and the message to be displayed. Spaces are
// allowed before and after each input item.
//
// Once input is complete, a frame labeled "Message Window"
// will appear. The message will be displayed in blue against
// a white background, with the lines of the message centered
// within the frame. The size of the frame will depend
// on the message and the font. The distance between the
// baselines of consecutive lines will match the font's
// height. The distance from the top of the graphics context
// to the baseline of the first line will be the font's ascent
// plus its leading. The space below the last line's baseline
// will be equal to the font's descent. The amount of
// horizontal space on either side of the widest line will
// also match the font's descent.

import java.awt.*;
import jpb.*;

public class MessageWindow {
public static void main(String[] args) {
// Prompt user to enter font name
SimpleIO.prompt("Enter font name: ");
String fontName = SimpleIO.readLine().trim();

// Prompt user to enter font size; convert to integer form
SimpleIO.prompt("Enter font size: ");
String fontSizeString = SimpleIO.readLine().trim();
int fontSize = Integer.parseInt(fontSizeString);

// Create drawable frame and font objects;
// obtain font metrics
DrawableFrame df = new DrawableFrame("Message Window");
Font f = new Font(fontName, Font.PLAIN, fontSize);
FontMetrics fm = df.getFontMetrics(f);

// Prompt user to enter number of lines in message;
// convert to integer form
SimpleIO.prompt("Enter number of lines in message: ");
String numLinesString = SimpleIO.readLine().trim();
int numLines = Integer.parseInt(numLinesString);

// Read and store lines in message, computing width of
// widest line
String[] lines = new String[numLines];
int maxLineWidth = 0;
for (int i = 0; i < numLines; i++) {
// Prompt user to enter a line; store it in array
SimpleIO.prompt("Enter line " + (i + 1) + ": ");
lines[i] = SimpleIO.readLine().trim();

// Compare width of line with maximum width read so
// far, replacing maximum width if necessary.
int lineWidth = fm.stringWidth(lines[i]);
if (lineWidth > maxLineWidth)
maxLineWidth = lineWidth;
}

// Open frame and set its size
df.show();
int borderSize = fm.getDescent();
int height = fm.getHeight();
df.setSize(maxLineWidth + borderSize * 2,
numLines * height + fm.getLeading());

// Obtain graphics context; set drawing color and font
Graphics g = df.getGraphicsContext();
g.setColor(Color.blue);
g.setFont(f);

// Display lines in message
int firstBaseline = fm.getLeading() + fm.getAscent();
for (int i = 0; i < numLines; i++) {
int lineWidth = fm.stringWidth(lines[i]);
g.drawString(lines[i],
borderSize + (maxLineWidth - lineWidth) / 2,
firstBaseline + i * height);
}

// Repaint frame
df.repaint();
}
}

Explanation / Answer

See the updated code below:

Let me know if you have any questions.

Joe

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