Class ExtendsStuff

java.lang.Object
  |
  +--java.awt.Component
        |
        +--java.awt.Container
              |
              +--java.awt.Window
                    |
                    +--java.awt.Frame
                          |
                          +--ExtendsStuff

public class ExtendsStuff

extends java.awt.Frame

ExtendsStuff - Show how Java's inheritance capability makes writing seemingly complex/powerful programs easy.

This class is used to introduce the concept of inheritance, building on top of the existing things that are sort-of what you want to do. In the lesson "What's Java?," the Edit-Compile-Execute process was introduced with a simple application that used System.out.println( ) to display a String. This class provides a mechanism to display a String in a pop-up window by invoking the method: printInWindow( ).

Field Summary

static int	FONT_SIZE Default Font Size for Displaying Strings
static int	WINDOW_HEIGHT Default Height of Pop-Up Window for Displaying Strings
static int	WINDOW_WIDTH Default Width of Pop-Up Window for Displaying Strings

Method Summary

void	printInWindow(java.lang.String message) Pop up a window and print some text in it.
void	setFontSize(int size) Set the height of the font to be used to display a String by invoking printInWindow().
void	setWindowHeight(int height) Set the height of the window that will be created to contain a String displayed by invoking printInWindow().
void	setWindowWidth(int width) Set the width of the window that will be created to contain a String displayed by invoking printInWindow().

Field Detail

FONT_SIZE

public static final int FONT_SIZE

Default Font Size for Displaying Strings

WINDOW_HEIGHT

public static final int WINDOW_HEIGHT

Default Height of Pop-Up Window for Displaying Strings

WINDOW_WIDTH

public static final int WINDOW_WIDTH

Default Width of Pop-Up Window for Displaying Strings

Method Detail

printInWindow

public void printInWindow(java.lang.String message)

Print some text in a window.

Append the supplied text to a StringBuffer and create a new Label consisting of its contents. The new Label will use the current FontSize, which can be changed via setFontSize() method.

The size of the Frame and the attributes of the "SansSerif" Font (size and style) are also set based on current values of private fields. These fields may be changed via setXxx() invocations.

Parameters:

text - String of text to be displayed in a window.

See Also:

setFontSize(int), setWindowHeight(int), setWindowWidth(int)

setFontSize

public void setFontSize(int size)

Set the height of the font to be used to display a String by invoking printInWindow().

Parameters:

size - Height of the font in points.

See Also:

printInWindow(java.lang.String)

setWindowHeight

public void setWindowHeight(int height)

Set the height of the window that will be created to contain a String displayed by invoking printInWindow().

Parameters:

height - number of pixels on window's Y axis.

See Also:

printInWindow(java.lang.String)

setWindowWidth

public void setWindowWidth(int width)

Set the width of the window that will be created to contain a String displayed by invoking printInWindow().

Parameters:

width - number of pixels on window's X axis.

See Also:

printInWindow(java.lang.String)