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1 factory., factory,. 2 2.,, JFileChooser. 1. Java,,, Serializable *1., FigBase ( 1). FigBase.java import java. lang.*; 2 import java. awt.*; 3 import java. io.*; 4 1 FigBase.java 5 public abstract class FigBase implements Serializable { 6 public static abstract class Factory { 7 public String name() { 8 return " FigBase"; 9 } public abstract FigBase generate( Point p, Point q); 12 }; 13 takao/toho/2007/. *1, Serializable java.io.* import. 1

2 14 FigBase() { 15 this( Color. black); 16 } FigBase( Color color) { 19 thecolor = color; 20 } public void draw( Graphics g) { g. setcolor( thecolor); } public void setcolor( Color color) { 25 thecolor = color; 26 } public static Color complementcolor( Color c) { 29 return new Color(255- c. getred(), 255- c. getgreen(), 255- c. getblue ()); 30 } Color thecolor; 33 }; Draw.java,., *2 : java.io.* import (6 ). (33, 34 ). JFileChooser (166 ). ( ). ( ). 1 import java. lang.*; 2 import java. awt.*; 3 import javax. swing.*; 4 import java. awt. event.*; 5 import java. util.*; 6 import java. io.*; 7 8 public class Draw extends JFrame { 9 public static void main( String[] args) { 10 Draw app = new Draw(" Draw Demo"); 11 } Draw( String title) { 14 super( title); 15 figs = new LinkedList <FigBase >(); 16 addmenu(); 2 Draw.java *2 4. 2

3 17 addlisteners(); 18 setsize(500, 400); 19 setvisible( true); 20 thecolor = Color. black; 21 setdefaultcloseoperation( EXIT_ON_CLOSE); 22 } void addmenu() { 25 JMenuBar mb = new JMenuBar(); 26 addfilemenu( mb); 27 addfigmenu( mb); 28 setjmenubar( mb); 29 } void addfilemenu( JMenuBar mb) { 32 JMenu mn = new JMenu(" File"); 33 addmenuitem(mn, "Save...", new FileSaveHandler ()); 34 addmenuitem(mn, "Load...", new FileLoadHandler ()); 35 mn. addseparator(); 36 addmenuitem(mn, " Exit", new ExitMenuHandler ()); mb. add( mn); 39 } void addmenuitem( JMenu mn, String title, ActionListener listener) { 42 JMenuItem mi = new JMenuItem( title); 43 mn. add( mi); 44 if ( listener!= null) { 45 mi. addactionlistener( listener); 46 } 47 } final FigBase. Factory[] factories = { 50 Line. factory, 51 Rect. factory, 52 }; 53 final FigBase. Factory defaultfactory = Line. factory; 54 FigBase. Factory thefactory; void addfigmenu( JMenuBar mb) { 57 JMenu mn = new JMenu(" Figure"); 58 ButtonGroup bg = new ButtonGroup (); 59 thefactory = defaultfactory; 60 for ( FigBase. Factory factory: factories) { 61 JRadioButtonMenuItem ri = figmenuitem( factory); 62 mn. add( ri); 63 bg. add( ri); 64 } 65 mb. add( mn); 66 } JRadioButtonMenuItem figmenuitem( FigBase. Factory factory) { 69 JRadioButtonMenuItem ri = new JRadioButtonMenuItem( factory. name()); 70 ri. addactionlistener( new FigureListener( factory)); 71 if ( factory == thefactory) { 3

4 72 ri. setselected( true); 73 } 74 return ri; 75 } void addlisteners() { 78 MouseHandler listener = new MouseHandler (); 79 addmouselistener( listener); 80 addmousemotionlistener( listener); 81 addwindowlistener( new CloseButtonListener ()); 82 } public void paint( Graphics g) { 85 super. paint(g); 86 for ( FigBase fig: figs) { 87 fig. draw(g); 88 } 89 } static class CloseButtonListener extends WindowAdapter { 92 public void windowclosing( WindowEvent e) { 93 System. exit(0); 94 } 95 }; static class ExitMenuHandler implements ActionListener { 98 public void actionperformed( ActionEvent e) { 99 System. exit(0); 100 } 101 }; Point p, q; LinkedList <FigBase > figs; 106 FigBase thisfigure; 107 Color thecolor; FigBase newfigure( Point p, Point q) { 110 FigBase fig = thefactory. generate(p, q); 111 fig. setcolor( thecolor); 112 return fig; 113 } class MouseHandler extends MouseAdapter 116 implements MouseMotionListener { 117 public void mousepressed( MouseEvent e) { 118 if (e. getclickcount() == 1) { 119 if (p == null q!= null) { 120 p = e. getpoint(); 121 thisfigure = newfigure(p, p); 122 } else { 123 if ( thisfigure!= null) { 124 Graphics g = getgraphics (); 125 g. setxormode( FigBase. complementcolor(g. getcolor ())); 126 thisfigure. draw(g); 4

5 127 } 128 q = e. getpoint(); 129 thisfigure = newfigure(p, q); 130 figs. add( thisfigure); 131 p = q = null; 132 thisfigure = null; 133 } 134 } repaint(); 137 } public void mousemoved( MouseEvent e) { 140 if ( thisfigure!= null) { 141 Graphics g = getgraphics (); 142 g. setxormode( FigBase. complementcolor(g. getcolor ())); 143 thisfigure. draw(g); 144 thisfigure = newfigure(p, e. getpoint ()); 145 thisfigure. draw(g); 146 } 147 } public void mousedragged( MouseEvent e) { } 150 }; class FigureListener implements ActionListener { 153 public FigureListener( FigBase. Factory f) { 154 factory = f; 155 } public void actionperformed( ActionEvent e) { 158 thefactory = factory; 159 p = null; 160 thisfigure = null; 161 repaint(); 162 } 163 FigBase. Factory factory; 164 }; JFileChooser fc = new JFileChooser (); 167 class FileLoadHandler implements ActionListener { 168 public void actionperformed( ActionEvent e) { 169 repaint(); 170 int retval = fc. showopendialog( null); 171 if ( retval == JFileChooser. APPROVE_OPTION) { 172 File f = fc. getselectedfile (); 173 try { 174 FileInputStream istream = new FileInputStream(f); 175 ObjectInputStream p = new ObjectInputStream( istream); figs = ( LinkedList <FigBase >) p. readobject (); 178 istream.close(); 179 } 180 catch ( FileNotFoundException ex) { 181 System. out. println(" FileNotFoundException"); 5

6 182 } 183 catch ( ClassNotFoundException ex) { 184 System. out. println(" ClassNotFoundException"); 185 } 186 catch ( IOException ex) { 187 System. out. println(" IOException"); 188 } 189 finally { 190 repaint(); 191 } 192 } 193 } 194 }; class FileSaveHandler implements ActionListener { 197 public void actionperformed( ActionEvent e) { 198 repaint(); 199 int retval = fc. showsavedialog( null); 200 if ( retval == JFileChooser. APPROVE_OPTION) { 201 File f = fc. getselectedfile (); 202 try { 203 FileOutputStream ostream = new FileOutputStream(f); 204 ObjectOutputStream p = new ObjectOutputStream( ostream); p. writeobject( figs); 207 p.flush(); 208 ostream.close(); 209 } 210 catch ( FileNotFoundException ex) { 211 System. out. println(" FileNotFoundException"); 212 } 213 catch ( IOException ex) { 214 System. out. println(" IOException"); 215 } 216 } 217 } 218 }; 219 }; 6