1 GUI GUI GUI GUI GUI. GUI(Graphical User Interface) JDK java.awt. ? Component

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1 GUI GUI JDK 1.1 GUI 1 GUI GUI GUI(Graphical User Interface) GUI (GUI ) / ( GUI ) Java GUI JDK Swing 1.1 java.awt GUI? Component setbounds(int, int, int, int) (x,y) setforeground(color) setbackground(color) setfont(font) 2 1

2 import java.applet.applet; import java.awt.*; public class R6Sample1 extends Applet { Font fn = new Font("Helvetica", Font.BOLD, 24); TextField txf = new TextField("text..."); Button b1 = new Button("B1"); Button b2 = new Button("B2"); setlayout(null); add(txf); txf.setforeground(color.red); txf.setbounds(20, 20, 200, 40); add(b1); b1.setfont(fn); b1.setbounds(20, 80, 60, 40); add(b2); b2.setfont(fn); b2.setbounds(120, 80, 60, 40); ( GUI ) init() Component add() setlayout(null) off ( ) ( ) ( ) Label Button Choice Checkbox CheckboxGroup TextField TextArea List Frame * MenuBar * Menu * PopupMenu * 1 2 (API ) * 3 GUI ( ) GUI Java a. 2

3 b. ( ) c. ( ) d. 2 ( ) GUI???? JDK Java JDK 1.1 GUI addactionlistener(actionlistner) ActionListener ActionListener actionperformed(actionevent) ActionListener implements actionperformed() GUI addactionlistener() GUI * import java.applet.applet; import java.awt.*; import java.awt.event.*; public class R6Sample2 extends Applet { Font fn = new Font("Helvetica", Font.BOLD, 16); Label l1 = new Label("*"); Button b1 = new Button("Press Me!"); setlayout(null); l1.setbackground(color.white); add(l1); l1.setfont(fn); l1.setbounds(20, 20, 160, 40); add(b1); b1.setfont(fn); b1.setbounds(20, 80, 100, 40); b1.addactionlistener(new R6Sample2Adapter(this)); public void press() { l1.settext(l1.gettext() + "*"); repaint(); class R6Sample2Adapter implements ActionListener { R6Sample2 app; public R6Sample2Adapter(R6Sample2 a) { app = a; public void actionperformed(actionevent e) { app.press(); 3

4 R6Sample2Adapter actionperformed() press() addactionlistener() press() * R6Sample2 ActionListener implements?? 3 ( ) import java.applet.applet; import java.awt.*; import java.awt.event.*; public class R6Sample3 extends Applet { Font fn = new Font("Helvetica", Font.BOLD, 16); Label l1 = new Label("*"); Button b1 = new Button("Press Me!"); setlayout(null); l1.setbackground(color.white); add(l1); l1.setfont(fn); l1.setbounds(20, 20, 160, 40); add(b1); b1.setfont(fn); b1.setbounds(20, 80, 100, 40); b1.addactionlistener(new MyAdapter()); class MyAdapter implements ActionListener { public void actionperformed(actionevent e) { l1.settext(l1.gettext() + "*"); repaint();?! implements 1 4

5 class MyXXXClass extends/implements YYY { //... new MyXXXClass( )... new MyXXXClass ( )... new YYY( ) { //... new import java.applet.applet; import java.awt.*; import java.awt.event.*; public class R6Sample4 extends Applet { Font fn = new Font("Helvetica", Font.BOLD, 16); Label l1 = new Label("*"); Button b1 = new Button("Press Me!"); setlayout(null); l1.setbackground(color.white); add(l1); l1.setfont(fn); l1.setbounds(20, 20, 160, 40); add(b1); b1.setfont(fn); b1.setbounds(20, 80, 100, 40); b1.addactionlistener(new ActionListener() { public void actionperformed(actionevent e) { l1.settext(l1.gettext() + "*"); repaint(); ); GUI ( 1 (1) implements GUI 5

6 1: interface R6Model { public String gettitle(); public String getbutton1label(); public String getbutton2label(); public String button1action(string s); public String button2action(string s); implements / class R6Sample5Model implements R6Model { public String gettitle() { return "Temperature Calc."; public String getbutton1label() { return "F to C"; public String getbutton2label() { return "C to F"; public String button1action(string s) { try { double f = new Double(s).doubleValue(); double c = 5.0*(f )/9.0; return (new Double(c)).toString(); catch(exception e) { return e.tostring(); public String button2action(string s) { try { double c = new Double(s).doubleValue(); double f = 9.0*c/ ; return (new Double(f)).toString(); catch(exception e) { return e.tostring(); import java.applet.applet; 6

7 import java.awt.*; import java.awt.event.*; public class R6Sample5 extends Applet { R6Model model = new R6Sample5Model(); Font fn = new Font("Helvetica", Font.BOLD, 16); Label l1 = new Label(model.getTitle()); Label l2 = new Label(""); TextField tf = new TextField(""); Button b1 = new Button(model.getButton1Label()); Button b2 = new Button(model.getButton2Label()); setlayout(null); l2.setbackground(color.white); add(l1); l1.setfont(fn); l1.setbounds(20, 10, 160, 40); add(l2); l2.setfont(fn); l2.setbounds(20, 60, 160, 40); add(tf); tf.setfont(fn); tf.setbounds(20, 110, 160, 40); add(b1); b1.setfont(fn); b1.setbounds(20, 160, 80, 40); add(b2); b2.setfont(fn); b2.setbounds(120, 160, 80, 40); b1.addactionlistener(new ActionListener() { public void actionperformed(actionevent e) { l2.settext(model.button1action(tf.gettext())); tf.settext(""); repaint(); ); b2.addactionlistener(new ActionListener() { public void actionperformed(actionevent e) { l2.settext(model.button2action(tf.gettext())); tf.settext(""); repaint(); ); interface R6Model { public String gettitle(); public String getbutton1label(); public String getbutton2label(); public String button1action(string s); public String button2action(string s); class R6Sample5Model implements R6Model { public String gettitle() { return "Temperature Calc."; public String getbutton1label() { return "F to C"; public String getbutton2label() { return "C to F"; public String button1action(string s) { try { double f = new Double(s).doubleValue(); 7

8 double c = 5.0*(f )/9.0; return (new Double(c)).toString(); catch(exception e) { return e.tostring(); public String button2action(string s) { try { double c = new Double(s).doubleValue(); double f = 9.0*c/ ; return (new Double(f)).toString(); catch(exception e) { return e.tostring(); (R6Model ) 5 6 ( : )

) / Java ( )

2002 3 2003.1.29 1 3 ( ) ( ) / Java ( ) 1 ( )? ( ) 2 (3 ) 3 Java Java Java (dynamic dispatch) ( ) import java.awt.*; import java.awt.event.*; public class Sample30 extends Frame { boolean go; double time;