1 Java Java GUI , 2 2 jlabel1 jlabel2 jlabel3 jtextfield1 jtextfield2 jtextfield3 jbutton1 jtextfield1 jtextfield2 jtextfield3

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1 MyTextField NetBeansIDE() MyTextField GUI ( 2 ) MyTokenizer MyTokenizer Calc A Java 20 A.1 java A.2 Java B GUI 23 C MyTokenizer.java 23 C D 23 E PC 23 E.1 FFFTP F 24 F

2 1 Java Java GUI , 2 2 jlabel1 jlabel2 jlabel3 jtextfield1 jtextfield2 jtextfield3 jbutton1 jtextfield1 jtextfield2 jtextfield3 1: Swing GUI 2.3 GUI jtextfield1 v1 2

3 2. jtextfield2 v2 3. y v1+v2 4. y jtextfield3 (NumberFormatException) try catch MyTextField (JTextField ) JTextField MyTextField MyTextField JTextField public void settext(double) settext public double getvalue() NetBeansIDE() NetBeansIDE Java C, Javascript, HTML : 1. NetBeansIDE (a) GUI (b) 5. / 1 1, 2 2 3

4 : 1. NetBeansIDE NetBeansIDE 2. (a) Java (b) (c) JavaJava > (d) CalcProgram (F) 3. (a) (F) (N) (b) Swing GUI JFrame (c) Calc (d) Calc.java Calc GUI 4. 1 ( GUI ) GUI (JFrame) (a) Swing 2 (JFrame) (b) 2: 4

5 (c) 1 ( ) jtextfield1, jtextfield ( (a) ActionactionPerformed (b) jbutton1actionperformed p r i v a t e void jbutton1actionperformed ( java. awt. event. ActionEvent evt ) { // TODO add your handling code here : = 1: private void jbutton1actionperformed(java.awt.event.actionevent evt) { double v1, v2, y; i. jtextfield1 v1 ii. jtextfield2 v2 iii. : y v1 + v2 iv. y jtextfield2 1 i. iv. i. jtextfield1 v1 JTextField JTextField gettext String st; // (String ) st = jtextfield1.gettext(); // v1 = Double.valueOf(st); // ii. jtextfield2 v2 v1 st = jtextfield2.gettext(); v2 = Double.valueOf(st); iii. : y = v1 + v2; iv. y jtextfield2 5

6 st = Double.toString(y); jtextfield2.settext(st); // 6. / (a) (R) (CalcProgram) (b) CalcProgram Calc OK Calc ( ) (, ) jbutton1 initcomponents Calc() public private () () (public) (private) Calc main Calc main public class Calc extends javax.wing.jframe { public Calc() { initcomponents(); private void initcomponents() {... private void jbutton1actionperformed(java.awt.event.actionevent evt) {... public static void main(string args[]) {... // private javax.swing.jbutton jbutton1; private javax.swing.jlabel jlabel1;... 6

7 initcomponents private void initcomponents() { jlabel1 = new javax.swing.jlabel(); // jlabel2 = new javax.swing.jlabel();... jlabel1.settext("");... jbutton1.addactionlistener(new java.awt.event.actionlistener() { public void actionperformed(java.awt.event.actionevent evt) { jbutton1actionperformed(evt); ); // (ActionListener)... // javax.swing.grouplayout layout = new javax.swing.grouplayout(getcontentpane()); getcontentpane().setlayout(layout);... private void jbutton1actionperformed(java.awt.event.action evt) { double v1, v2, y; String st; st = jtextfield1.gettext(); v1 = Double.valueOf(st);... st = Double.toString(y); jtextfield2.settext(st); ( { ) v1, v2, y, st jbutton1, jlabel1 Calc Calc(), new initcomponents() jlabel1 = new javax.swing.jlabel(); JLabel jlabel1 ( 3) Calc jlabel1 jbutton1actionperformed(... ) v1 JLabel 3: jtextfield2.settext(st); st jtextfield3 settext ( 4) 7

Calc jtextfield3 jbutton1actionperformed(... ) st "52.8" jtextfield3.settext(st) JTextField 4: 2.6.

8 Calc jtextfield3 jbutton1actionperformed(... ) st "52.8" jtextfield3.settext(st) JTextField 4: ( 5) (Exception) (NumberFormatException) 5: 5 NumberFormatException java try catch try { try catch(exceptiontype param) { try ExceptionType NumberFormatException 5 jbutton1actionperformed 2 jbuttonactionperformed showmessagedialog 6 javax.swing.joptionpane.showmessage... ( import ) java import import C include 8

9 2: try catch private void jbutton1actionperformed(java.awt.event.actionevent evt) { try { double v1, v2, y; String st; // st... () jtextfield3.settext(st); // jtextfield3 catch (NumberFormatException e) { showmessagedialog(null, ""); import 6: showmessagedialog import MyTextField GUI Swing JTextField 2 JTextField MyTextField MyTextField jtextfield (jtextfield ) settext(double) double getvalue() 1. MyTextField (a) (F) (b) JavaJava > (c) MyTextField (F) 9

10 3: MyTextField public class MyTextField extends javax.swing.jtextfield { public void settext(double v) { settext(double.tostring(v)); public double getvalue() { String st = gettext(); return Double.valueOf(st); 2. MyTextField.java 3 3. MyTextField.java 4. Calc.java 5. jtextfield1 jtextfield3 6. MyTextField.java JFrame MyTextField mytextfield1, mytextfield2, mytextfield3 7. jbutton1actionperformed 4 4: jbutton1actionperformed private void jbutton1actionperformed(java.awt.event.actionevent evt) { double v1, v2; try { v1 = mytextfield1.getvalue(); // mytextfield1 v1 v2 = mytextfield2.getvalue(); // mytextfield2 v2 mytextfield3.settext(v1+v2); // mytextfield3 catch(numberformatexception e) { showmessagedialog(null, ""); 2.7 () 10

11 class Calc Calc( ) jbutton1 = new JButton(); jlabel1 = new JLabel(); jlabel2 = new JLabel(); main( ) JButton jbutton1actionperformed( ) JLabel1 jbutton1 jlabel1 jlabel2 JLabel2 Calc jbutton1actionperformed JButton ( ) try catch private, public ( ) settext(string) settext(double) () extends GUI NetBeansIDE GUI ( ) Swing GUI JFrame 3. () / 11

12 3 2 ( 2 ) 3.1 Java GUI *(10-6) 12, +, 4.5 (, ) (, token) C (10-5) ( 10-5 ) 7: (10 + 5)/3 3 (term) * 3 (10 + 5)/3 (factor) * 3 (10 + 5) / 3 12

13 (expr) * 3 ( ) / 3 (BNF, Backus-Naur form) ::= ± ::= * / ::= ( ) ::= (or) 1 + ::= ( ± ) ::= { ( ) ( / ) ::= ( ) * () 0 ::= { ( ) ( / ) ( )( / ) (0 ) MyTokenizer java.io.streamtokenizer ( ) ( 7) MyTokenizer MyTokenizer java.io.streamtokenizer (1 ) StreeamTokenizer () 13

14 MyTokenizer(String) double nval int ttype static int TT EOF static int TT NUMBER nexttoken int nexttoken() void pushback() 1 ( ) nval nexttoken int nexttoken() ( ) () TT NUMBER TT WORD TT EOF (1 ) : MyTokenizer 14

15 input 12.5 (abc )/10 nexttoken() nexttoken() input (abc )/10 input )/10 ttype TT_NUMBER ttype TT_WORD nval 12.5 sval abc nexttoken() pushback() input ttype (abc )/10 input abc )/10 nexttoken() nexttoken() input abc )/10 input )/10 ttype ( ttype sval TT_WORD abc [ ] MyTokenizer () Calc 9 ± expression factor + ( ) term * / 9: ( ) *(8-3)5+(10-(2+4)/2)/2 15

16 5.2.2 CalcProgram2 MyTokenizer (: MyTokenizer.java) Clac.java jtextfield1 () jtextfield2 jbutton1 ( ) MyTokenizer token () double expression() double term() double factor() jbutton1 1. token token MyTokenizer token; 2. jbutton1 (a) ( ) token String str = jtextfield1.gettext(); token = new MyTokenizer(str); (b) (expression) double y = expression(); (c) () jtextfield2 jtextfield2.settext(double.tostring(y)); (d) : () () 1 TT EOF( ) showmessage- Dialog 1 1 ( ) import import static javax.swing.joptionpane.*; 16

17 switch(token.nexttoken()) { case MyTokenizer.TT_EOF: break; case MyTokenizer.TT_NUMBER: showmessagedialog(null,"error! [" + token.nval + "]"); break; default: showmessagedialog(null,"error! ["+(char)token.ttype+"]"); public void jbutton1actionperformed(java.awt....) { (a) token try { (b) (c) [(d) ] // catch(ioexception e) { showmessagedialog(null, ""); 3. expression() + y y + y y y 10: ( ) 10 (a) y y = term(); + y y + y y y (b) while(true) {... + i. () 1 17

18 token.nexttoken(); switch(ttype) { case...; case...; ii. + y case + : y += term(); break; + y y + y y return y iii. y case + : y -= term(); break; + y y + y y return y iv. : +, (pushback()) y default: token.pushback(); return y; + y y + y y return y private double expression() throws IOException { double y; (a) y while(true) { switch(token.nexttoken()) { ii. + y iii. - y iv. 4. term() 18

19 double term() * / 5. factor() double factor() nexttoken() ==TT_NUMBER ynval return y == ( ( ) error yexpression() (a) token i. i. expression ii. iii term factor (2+3) () 19

20 A Java (class) ( ) JAVA 3 Java 1.java (object) (20) () (2.5, 4.0) 11: 12 b. (100); // b a. (500); // a (.) class { (;) 20

21 car a b CA Jhon Doe GA : C class : () ( ) { A.1 java example.java [] 21

22 public class example { String name; public static void main(string args[]) { String localstr; name = ""; localstr = ""; System.out.println(""+name+localStr+" "); set(""); System.out.println(""+name+localStr+""); void set(string st) { name = st; C main 3 main example main set 2 String ( ) name String (String) + A.2 Java 1. private, public 14: 2. ( ) 3. () 22

23 B C GUI MyTokenizer.java C.1 import java.io.*; public class MyTokenizer extends StreamTokenizer { MyTokenizer(String st) { super( new BufferedReader( new InputStreamReader( new ByteArrayInputStream(st.getBytes())))); resetsyntax(); parsenumbers(); whitespacechars(0, 32); ordinarychar( - ); wordchars( A, Z ); wordchars( a, z ); D ( ) : : E PC wr cs [] Windows USB 23

24 E.1 FFFTP F ( ) 5. (IDE ) F.1 ( ) 24

目次 Java GUI 3 1 概要クラス構成ソースコード例課題...7 i

目次 Java GUI 3 1 概要クラス構成ソースコード例課題...7 i Java GUI 3 Java GUI 3 - サンプルプログラム (1) - 2011-09-25 Version 1.00 K. Yanai 目次 Java GUI 3 1 概要...1 2 クラス構成...2 3 ソースコード例...3 4 課題...7 i 1 概要まずは簡単なサンプルプログラムをみながら Java GUI の基本的なことを学びましょう本サンプルは図に示すようなひとつのメイン画面を使用します