19 3!! (+) (>) (++) (+=) for while 3.1!! (20, 20) (1)(Blocks1.java) import javax.swing.japplet; import java.awt.graphics;

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みりあたつざわ
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1 19 3!! (+) (>) (++) (+=) for while 3.1!! (20, 20) (1)(Blocks1.java) public class Blocks1 extends JApplet { public void paint(graphics g){ 5 g.drawrect( 20, 20, 50, 20); g.drawrect( 90, 20, 50, 20); g.drawrect(160, 20, 50, 20); g.drawrect(230, 20, 50, 20); g.drawrect(300, 20, 50, 20); (20, 20),

2 20 3!! (90, 20), (160, 20), (230, 20), (300, 20) O x y (20, 20) (20, 20) (20, 20)

3 3.1!! (2)(Blocks2.java) public class Blocks2 extends JApplet { public void paint(graphics g){ 5 int w = 50, h = 20, x = 20, y = 20, space = 20; x = x + w + space; 10 x = x + w + space; x = x + w + space; 15 x = x + w + space; 20 (variable) Java (type) 1, 12, -50 int 1.23, float, double (declaration) ;,,... ; (int, double ) ( ) int w; double s, s1, s_x; camel case camel case = (assignment) = ; w = 50; w 50 Java

22 3!! int w = 50; Java F.3 3.1.1 (x, y) (x +, y) = (x + +, y) w space x + (w + space) 10 x( 20) w, space( 50 20) x x 90 3.1.6 3.2(a) gif a (10, 10) a (http://ushikai.com/index.htm) web 3.1.3 (1)(ImagePut.

4 22 3!! int w = 50; Java F (x, y) (x +, y) = (x + +, y) w space x + (w + space) 10 x( 20) w, space( 50 20) x x (a) gif a (10, 10) a ( web (1)(ImagePut.java) import javax.swing.imageicon; public class ImagePut extends JApplet { 5 ImageIcon icon; public void init(){ icon = new ImageIcon(getImage(getCodeBase(), "den1s.gif")); 10 public void paint(graphics g) { icon.painticon(this, g, 10, 10); 15 (a) (den1s.gif) (b) (c) applet ImageIcon

5 3.1!! 23 init applet URL(Uniform Resource Locator) URL *1 getcodebase applet URL URL *2 ImageIcon painticon this this applet (a) gif (10, 10) (2)(ImagePutBox.java) import javax.swing.imageicon; public class ImagePutBox extends JApplet { 5 ImageIcon icon; int w, h; public void init(){ icon = new ImageIcon(getImage(getCodeBase(), "den1s.gif")); 10 w = icon.geticonwidth(); h = icon.geticonheight(); public void paint(graphics g) { 15 icon.painticon(this, g, 10, 10); g.drawrect(10, 10, w, h); (a) gif (a) gif (20, 20) (20, 20) *1 rocky/lecture/java/src/den1s.gif URL " rocky/lecture/java/src/" "den1s.gif" URL " rocky/lecture/java/" "./src/den1s.gif" *2 rocky/lecture/java/src/imageput.html applet URL rocky/lecture/java/src/

6 24 3!! (a) gif !! Java while for do-while for while for (3)(Blocks3.java) public class Blocks3 extends JApplet { public void paint(graphics g){ 5 int w = 50, h = 20, x = 20, y = 20, space = 20, i; for(i = 0; i < 5; i++){ x = x + w + space; for for for 3 for for ( ; ; ) : for : : for false true 3.3 for for

7 3.2!! 25 for for(i = 0; i < 5; i++){ ; i 0 i 1 i 5 < i 5 (true) 5 (false) F Java for (20, 20) for (20, 20) for 3.2(a) gif (20, 20) HTML (4)(Blocks4.java) import java.awt.dimension; public class Blocks4 extends JApplet { 5 public void paint(graphics g){ int w = 50, h = 20, x = 20, y = 20, space = 20; Dimension d = getsize(); while(x + w < d.width){ 10 x = x + w + space; 15

8 26 3!! html ( 200 )(blocks4-200.html) <html> <applet code="blocks4.class" width=200 height=60> </applet> </htlm> html ( 800 )(blocks4-800.html) <html> <applet code="blocks4.class" width=800 height=60> </applet> </htlm> while getsize while x w d.width while while( ) false true while while 3.4 while (20, 20) HTML (20, 20) HTML (a) gif 3.3!! (20, 20)

9 (5)(Blocks5.java) public class Blocks5 extends JApplet { public void paint(graphics g){ 5 int w = 50, h = 20, xs = 20, ys = 10; for(int j = 0, y = 20; j < 5; j++, y += (h + ys)){ for(int i = 0, x = 20; i < 5; i++, x += (w + xs)){ 10 for while for for 5 x 20 w + xs = 70 9 i, x 0, 20 Java for for i, x j, y i x (w + xs) x += (w + xs) x = x + (w + xs) 9 11 for 5 for y (h + ys) for 5 5 for (20, 20) HTML (a) gif (a) (b) (a) gif 3.5(a) 3.6(a) (a) gif 3.5(b) 3.6(b)

10 28 3!! (a) (b) 3.5 (a) (b) (a) (b) (a) (b)

11 (a) (b) 3.7 (a) (b) 3.8

Java演習(4) -- 変数と型 --

Java演習(4) -- 変数と型 -- 50 20 20 5 (20, 20) O 50 100 150 200 250 300 350 x (reserved 50 100 y 50 20 20 5 (20, 20) (1)(Blocks1.java) import javax.swing.japplet; import java.awt.graphics; (reserved public class Blocks1 extends