// Exercise 10.9 Solution

// Align.java

// This program creates a simple GUI

import java.applet.Applet;

import java.awt.*;

public class Align extends Applet {

private Button ok, cancel, help;

private TextField xValue, yValue;

private Checkbox snap, show;

private Label xLabel, yLabel;

private Panel checkPanel, buttonPanel,

fieldPanel1, fieldPanel2,

fieldPanel;

public void init()

{

// build checkPanel

snap = new Checkbox( "Snap to Grid" );

show = new Checkbox( "Show Grid" );

checkPanel = new Panel();

checkPanel.setLayout( new GridLayout( 2 , 1 ) );

checkPanel.add( snap );

checkPanel.add( show );

// build field panel1

xLabel = new Label( "X: " );

xValue = new TextField( "8", 3 );

fieldPanel1 = new Panel();

fieldPanel1.setLayout( new FlowLayout( FlowLayout.CENTER, 3, 5 ) );

fieldPanel1.add( xLabel );

fieldPanel1.add( xValue );

yLabel = new Label( "Y: " );

yValue = new TextField( "8", 3 );

fieldPanel2 = new Panel();

fieldPanel2.setLayout( new FlowLayout( FlowLayout.CENTER, 3, 5 ) );

fieldPanel2.add( yLabel );

fieldPanel2.add( yValue );

fieldPanel = new Panel();

fieldPanel.setLayout( new BorderLayout() );

fieldPanel.add( fieldPanel1, BorderLayout.NORTH );

fieldPanel.add( fieldPanel2, BorderLayout.SOUTH );

// build button panel

ok = new Button( "Ok" );

cancel = new Button( "Cancel" );

help = new Button( "Help" );

buttonPanel = new Panel();

buttonPanel.setLayout( new GridLayout( 3, 1, 10, 5 ) );

buttonPanel.add( ok );

buttonPanel.add( cancel );

buttonPanel.add( help );

// set layout for applet

setLayout( new FlowLayout( FlowLayout.CENTER, 10, 5 ) );

add( checkPanel );

add( fieldPanel );

add( buttonPanel );

}

}

// Solution exercise 10.10

// Calculator.java

// This program creates a simple GUI

// html: width = 270 height = 200

import java.applet.Applet;

import java.awt.*;

public class Calculator extends Applet {

private Button keys[];

private Panel keyPad;

private TextField lcd;

public void init()

{

lcd = new TextField( 20 );

keyPad = new Panel();

keys = new Button[ 16 ];

lcd.setEditable( false );

for ( int i = 0; i <= 9; i++ )

keys[ i ] = new Button( String.valueOf( i ) );

keys[ 10 ] = new Button( "/" );

keys[ 11 ] = new Button( "*" );

keys[ 12 ] = new Button( "-" );

keys[ 13 ] = new Button( "+" );

keys[ 14 ] = new Button( "=" );

keys[ 15 ] = new Button( "." );

// set keyPad layout to grid layout

keyPad.setLayout( new GridLayout( 4, 4 ) );

for ( int i = 7; i <= 10; i++ ) // 7, 8, 9, 10

keyPad.add( keys[ i ] ); // divide

for ( int i = 4; i <= 6; i++ ) // 4, 5, 6

keyPad.add( keys[ i ] );

keyPad.add( keys[ 11 ] ); // multiply

for ( int i = 1; i <= 3; i++ ) // 1, 2, 3

keyPad.add( keys[ i ] );

keyPad.add( keys[ 12 ] ); // subtract

keyPad.add( keys[ 0 ] ); // 0

for (int i = 15; i >= 13; i--)

keyPad.add( keys[ i ] ); // ., =, add

// set applet layout to border layout

setLayout( new BorderLayout() );

add( lcd, BorderLayout.NORTH );

add( keyPad, BorderLayout.CENTER );

}

}

// Exercise 10.11 solution

// ColorSelect.java

// This program creates a simple GUI

import java.applet.Applet;

import java.awt.*;

public class ColorSelect extends Applet {

private Button ok, cancel;

private Checkbox b, f;

private Choice colorList;

private Panel p, p1;

public void init()

{

// applet

setLayout( new BorderLayout() );

// north

colorList = new Choice();

colorList.addItem( "RED" );

add( colorList, BorderLayout.NORTH );

// center

p = new Panel();

b = new Checkbox( "background" );

f = new Checkbox( "foreground" );

p.add( b );

p.add( f );

add( p, BorderLayout.CENTER );

// south

ok = new Button( "Ok" );

cancel = new Button( "Cancel" );

p1 = new Panel();

p1.add( ok );

p1.add( cancel );

add( p1, BorderLayout.SOUTH );

}

}

// Exercise 10.12 Solution

// Printer.java

// This program creates a simple GUI

// html: width = 400 height = 130

import java.applet.Applet;

import java.awt.*;

public class Printer extends Applet {

private Button b1, b2, b3, b4;

private Checkbox c1, c2, c3, c4, c5, c6, c7;

private Choice q;

private Label label1, label2;

private Panel p1, p2, p3, p4, p5, p6, p7, p8;

private CheckboxGroup cbg;

public void init()

{

// build left north panel

label1 = new Label( "Printer: Epson EPL-7000" );

p1 = new Panel();

p1.setLayout( new FlowLayout( FlowLayout.LEFT ) );

p1.add( label1 );

// build right east panel

b1 = new Button( "Ok" );

b2 = new Button( "Cancel" );

b3 = new Button( "Setup..." );

b4 = new Button( "Help" );

p2 = new Panel();

p2.setLayout( new GridLayout( 4, 1, 5, 5 ) );

p2.add( b1 );

p2.add( b2 );

p2.add( b3 );

p2.add( b4 );

// build left south panel

label2 = new Label( "Print Quality: " );

q = new Choice();

q.addItem( "High" );

c1 = new Checkbox( "Print to File" );

p3 = new Panel();

p3.setLayout( new FlowLayout( FlowLayout.LEFT, 10, 0 ) );

p3.add( label2 );

p3.add( q );

p3.add( c1 );

// build left east panel

c2 = new Checkbox( "Image" );

c3 = new Checkbox( "Text" );

c4 = new Checkbox( "Code" );

p4 = new Panel();

p4.setLayout( new BorderLayout( ) );

p4.add( c2, BorderLayout.NORTH );

p4.add( c3, BorderLayout.CENTER );

p4.add( c4, BorderLayout.SOUTH );

// build left west panel

cbg = new CheckboxGroup();

p5 = new Panel();

p5.setLayout( new BorderLayout() );

p5.add( c5 = new Checkbox( "Selection", cbg, false ),

BorderLayout.NORTH );

p5.add( c6 = new Checkbox( "All", cbg, true ),

BorderLayout.CENTER );

p5.add( c7 = new Checkbox( "Applet", cbg, false ),

BorderLayout.SOUTH );

// build left center

p8 = new Panel();

p8.setLayout( new FlowLayout( FlowLayout.CENTER, 30, 0 ) );

p8.setBackground( Color.white );

p8.add( p4 );

p8.add( p5 );

// setup left panel

p6 = new Panel();

p6.setLayout( new BorderLayout() );

p6.add( p1, BorderLayout.NORTH );

p6.add( p8, BorderLayout.CENTER );

p6.add( p3, BorderLayout.SOUTH );

// setup applet layout

p7 = new Panel();

p7.setLayout( new FlowLayout( FlowLayout.CENTER, 10, 0 ) );

p7.add( p6 );

p7.add( p2 );

add( p7 );

}

}

// Exercise 10.14 Solution

// Convert.java

// Temperature conversion program

import java.applet.Applet;

import java.awt.*;

import java.awt.event.*;

public class Convert extends Applet

implements ActionListener {

private Panel p;

private Label label1, label2;

private TextField temperatureF;

private TextField temperatureC;

public void init()

{

setLayout( new BorderLayout() );

p = new Panel();

p.setLayout( new BorderLayout() );

label1 = new Label( "Enter Fahrenheit temperature:" );

label2 = new Label( "Temperature in Celcius is:" );

temperatureF = new TextField( 10 );

temperatureF.addActionListener( this );

temperatureC = new TextField( 10 );

temperatureC.setEditable( false );

add( label1, BorderLayout.NORTH );

p.add( temperatureF, BorderLayout.NORTH );

p.add( label2, BorderLayout.SOUTH );

add( p, BorderLayout.CENTER );

add( temperatureC, BorderLayout.SOUTH );

}

public void actionPerformed( ActionEvent e )

{

int celcius, temp;

temp = Integer.parseInt( temperatureF.getText() );

celcius = ( int ) ( 5.0f / 9.0f * ( temp - 32 ) );

temperatureC.setText( String.valueOf( celcius ) );

}

}

// Exercise 10.30 Solution

// Draw2.java

// Program draws a rectangle with the mouse

// NOTE: This solution is virtually

// identical to Exercise 10.16

import java.applet.Applet;

import java.awt.*;

import java.awt.event.*;

public class Draw2 extends Applet {

private int topX, topY;

private int width, height;

private int bottomX, bottomY;

public void init()

{

topX = topY = 0;

addMouseListener( new MouseHandler( this ) );

}

public void setTopX( int x ) { topX = x; }

public void setTopY( int y ) { topY = y; }

public void setBottomX( int x ) { bottomX = x; }

public void setBottomY( int y ) { bottomY = y; }

public void paint( Graphics g )

{

width = Math.abs( topX - bottomX );

height = Math.abs( topY - bottomY );

topX = Math.min( topX, bottomX );

topY = Math.min( topY, bottomY );

g.drawRect( topX, topY, width, height );

}

}

class MouseHandler extends MouseAdapter {

private Draw2 draw;

public MouseHandler( Draw2 d ) { draw = d; }

public void mouseReleased( MouseEvent e )

{

draw.setBottomX( e.getX() );

draw.setBottomY( e.getY() );

draw.repaint();

}

public void mousePressed( MouseEvent e )

{

draw.setTopX( e.getX() );

draw.setTopY( e.getY() );

}

}

// Exercise 10.31 Solution

// Draw3.java

// Program draws a rectangle with the mouse

import java.applet.Applet;

import java.awt.*;

import java.awt.event.*;

public class Draw3 extends Applet {

private int topX, topY;

private int width, height, upperX, upperY;

private int bottomX, bottomY;

public void init()

{

addMouseListener( new MouseHandler( this ) );

addMouseMotionListener( new MouseHandler2( this ) );

}

public void setTopX( int x ) { topX = x; }

public void setTopY( int y ) { topY = y; }

public void setBottomX( int x ) { bottomX = x; }

public void setBottomY( int y ) { bottomY = y; }

public void paint( Graphics g )

{

width = Math.abs( topX - bottomX );

height = Math.abs( topY - bottomY );

upperX = Math.min( topX, bottomX );

upperY = Math.min( topY, bottomY );

g.drawRect( upperX, upperY, width, height );

}

}

class MouseHandler extends MouseAdapter {

private Draw3 draw;

public MouseHandler( Draw3 d ) { draw = d; }

public void mouseReleased( MouseEvent e )

{

draw.setBottomX( e.getX() );

draw.setBottomY( e.getY() );

draw.repaint();

}

public void mousePressed( MouseEvent e )

{

draw.setTopX( e.getX() );

draw.setTopY( e.getY() );

}

}

class MouseHandler2 extends MouseMotionAdapter {

private Draw3 draw;

public MouseHandler2( Draw3 d ) { draw = d; }

public void mouseDragged( MouseEvent e )

{

draw.setBottomX( e.getX() );

draw.setBottomY( e.getY() );

draw.repaint();

}

}

// Exercise 10.32 Solution

// Draw4.java

// Program draws a shape with the mouse

import java.applet.Applet;

import java.awt.*;

import java.awt.event.*;

public class Draw4 extends Applet

implements ItemListener {

private int topX, topY, shape;

private int width, height, upperX, upperY;

private int bottomX, bottomY;

private Choice choice;

private final int RECTANGLE = 0;

private final int OVAL = 1;

private final int LINE = 2;

private final int ROUND = 3;

public void init()

{

choice = new Choice();

choice.addItem( "Rectangle" );

choice.addItem( "Oval" );

choice.addItem( "Line" );

choice.addItem( "Rounded Rectangle" );

choice.addItemListener( this );

addMouseListener( new MouseHandler( this ) );

addMouseMotionListener( new MouseHandler2( this ) );

add( choice );

}

public void setTopX( int x ) { topX = x; }

public void setTopY( int y ) { topY = y; }

public void setBottomX( int x ) { bottomX = x; }

public void setBottomY( int y ) { bottomY = y; }

public void paint( Graphics g )

{

width = Math.abs( topX - bottomX );

height = Math.abs( topY - bottomY );

upperX = Math.min( topX, bottomX );

upperY = Math.min( topY, bottomY );

switch ( shape ) {

case RECTANGLE:

g.drawRect( upperX, upperY, width, height );

break;

case OVAL:

g.drawOval( upperX, upperY, width, height );

break;

case LINE:

g.drawLine( topX, topY, bottomX, bottomY );

break;

case ROUND:

g.drawRoundRect( upperX, upperY, width,

height, 10, 20 );

break;

}

}

public void setShape( int s ) { shape = s; }

public void itemStateChanged( ItemEvent e )

{

setShape( choice.getSelectedIndex() );

}

}

class MouseHandler extends MouseAdapter {

private Draw4 draw;

public MouseHandler( Draw4 d ) { draw = d; }

public void mouseReleased( MouseEvent e )

{

draw.setBottomX( e.getX() );

draw.setBottomY( e.getY() );

draw.repaint();

}

public void mousePressed( MouseEvent e )

{

draw.setTopX( e.getX() );

draw.setTopY( e.getY() );

}

}

class MouseHandler2 extends MouseMotionAdapter {

private Draw4 draw;

public MouseHandler2( Draw4 d ) { draw = d; }

public void mouseDragged( MouseEvent e )

{

draw.setBottomX( e.getX() );

draw.setBottomY( e.getY() );

draw.repaint();

}

}

// Exercise 10.33 Solution

// Draw5.java

// Program draws a shape with the mouse

// in different colors

import java.applet.Applet;

import java.awt.*;

import java.awt.event.*;

public class Draw5 extends Applet

implements ItemListener {

private int topX, topY, shape;

private int width, height, upperX, upperY;

private int bottomX, bottomY, color;

private Choice choice, choice2;

private final int RECTANGLE = 0;

private final int OVAL = 1;

private final int LINE = 2;

private final int ROUND = 3;

private Color colors[] = { Color.black, Color.blue,

Color.red };

public void init()

{

choice = new Choice();

choice.addItem( "Rectangle" );

choice.addItem( "Oval" );

choice.addItem( "Line" );

choice.addItem( "Rounded Rectangle" );

choice.addItemListener( this );

choice2 = new Choice();

choice2.addItem( "Black" );

choice2.addItem( "Blue" );

choice2.addItem( "Red" );

choice2.addItemListener( this );

addMouseListener( new MouseHandler( this ) );

addMouseMotionListener( new MouseHandler2( this ) );

add( choice );

add( choice2 );

}

public void setTopX( int x ) { topX = x; }

public void setTopY( int y ) { topY = y; }

public void setBottomX( int x ) { bottomX = x; }

public void setBottomY( int y ) { bottomY = y; }

public void paint( Graphics g )

{

width = Math.abs( topX - bottomX );

height = Math.abs( topY - bottomY );

upperX = Math.min( topX, bottomX );

upperY = Math.min( topY, bottomY );

g.setColor( colors[ color ] );

switch ( shape ) {

case RECTANGLE:

g.drawRect( upperX, upperY, width, height );

break;

case OVAL:

g.drawOval( upperX, upperY, width, height );

break;

case LINE:

g.drawLine( topX, topY, bottomX, bottomY );

break;

case ROUND:

g.drawRoundRect( upperX, upperY, width,

height, 10, 20 );

break;

}

}

public void setShape( int s ) { shape = s; }

public void setColor( int c ) { color = c; }

public void itemStateChanged( ItemEvent e )

{

if ( e.getItemSelectable() == choice )

setShape( choice.getSelectedIndex() );

else

setColor( choice2.getSelectedIndex() );

}

}

class MouseHandler extends MouseAdapter {

private Draw5 draw;

public MouseHandler( Draw5 d ) { draw = d; }

public void mouseReleased( MouseEvent e )

{

draw.setBottomX( e.getX() );

draw.setBottomY( e.getY() );

draw.repaint();

}

public void mousePressed( MouseEvent e )

{

draw.setTopX( e.getX() );

draw.setTopY( e.getY() );

}

}

class MouseHandler2 extends MouseMotionAdapter {

private Draw5 draw;

public MouseHandler2( Draw5 d ) { draw = d; }

public void mouseDragged( MouseEvent e )

{

draw.setBottomX( e.getX() );

draw.setBottomY( e.getY() );

draw.repaint();

}

}

// Exercise 10.34 Solution

// Draw6.java

// Program draws a shape with the mouse

// in different colors; empty or filled

import java.applet.Applet;

import java.awt.*;

import java.awt.event.*;

public class Draw6 extends Applet

implements ItemListener {

private int topX, topY, shape;

private int width, height, upperX, upperY;

private int bottomX, bottomY, color;

private Choice choice, choice2;

private Checkbox filled, empty;

private CheckboxGroup radio;

private boolean fillOn;

private final int RECTANGLE = 0;

private final int OVAL = 1;

private final int LINE = 2;

private final int ROUND = 3;

private Color colors[] = { Color.black, Color.blue,

Color.red };

public void init()

{

radio = new CheckboxGroup();

filled = new Checkbox( "filled", radio, false );

empty = new Checkbox( "empty", radio, true );

filled.addItemListener( this );

empty.addItemListener( this );

choice = new Choice();

choice.addItem( "Rectangle" );

choice.addItem( "Oval" );

choice.addItem( "Line" );

choice.addItem( "Rounded Rectangle" );

choice.addItemListener( this );

choice2 = new Choice();

choice2.addItem( "Black" );

choice2.addItem( "Blue" );

choice2.addItem( "Red" );

choice2.addItemListener( this );

addMouseListener( new MouseHandler( this ) );

addMouseMotionListener( new MouseHandler2( this ) );

add( choice );

add( choice2 );

add( empty );

add( filled );

}

public void setTopX( int x ) { topX = x; }

public void setTopY( int y ) { topY = y; }

public void setBottomX( int x ) { bottomX = x; }

public void setBottomY( int y ) { bottomY = y; }

public void paint( Graphics g )

{

width = Math.abs( topX - bottomX );

height = Math.abs( topY - bottomY );

upperX = Math.min( topX, bottomX );

upperY = Math.min( topY, bottomY );

g.setColor( colors[ color ] );

switch ( shape ) {

case RECTANGLE:

if ( fillOn )

g.fillRect( upperX, upperY, width, height );

else

g.drawRect( upperX, upperY, width, height );

break;

case OVAL:

if ( fillOn )

g.fillOval( upperX, upperY, width, height );

else

g.drawOval( upperX, upperY, width, height );

break;

case LINE:

g.drawLine( topX, topY, bottomX, bottomY );

break;

case ROUND:

if ( fillOn )

g.fillRoundRect( upperX, upperY, width,

height, 10, 20 );

else

g.drawRoundRect( upperX, upperY, width,

height, 10, 20 );

break;

}

}

public void setShape( int s ) { shape = s; }

public void setColor( int c ) { color = c; }

public void itemStateChanged( ItemEvent e )

{

if ( e.getSource() instanceof Choice )

if ( e.getItemSelectable() == choice )

setShape( choice.getSelectedIndex() );

else

setColor( choice2.getSelectedIndex() );

else // radio button

if ( empty.getState() == true )

fillOn = false;

else

fillOn = true;

}

}

class MouseHandler extends MouseAdapter {

private Draw6 draw;

public MouseHandler( Draw6 d ) { draw = d; }

public void mouseReleased( MouseEvent e )

{

draw.setBottomX( e.getX() );

draw.setBottomY( e.getY() );

draw.repaint();

}

public void mousePressed( MouseEvent e )

{

draw.setTopX( e.getX() );

draw.setTopY( e.getY() );

}

}

class MouseHandler2 extends MouseMotionAdapter {

private Draw6 draw;

public MouseHandler2( Draw6 d ) { draw = d; }

public void mouseDragged( MouseEvent e )

{

draw.setBottomX( e.getX() );

draw.setBottomY( e.getY() );

draw.repaint();

}

}