Γ ΕΠΑΛ ΕΙΔΙΚΑ ΘΕΜΑΤΑ ΣΤΟΝ ΠΡΟΓΡΑΜΜΑΤΙΣΜΟ ΚΕΦ1 2

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................................................................... 8

1.1. Java ........................................................................................... 10

1.2. ................................................................................... 11

1.3. ...................................................................... 12

1.3.1. Greenfoot ....................................................................................................................... 12

1.3.2. Eclipse ............................................................................................................................ 13

1.4. ........................................................................................................... 14

1.5. ................................................................................................... 15

1.6. (attributes) ......................................................................................... 20

1.7. ............................................................................................ 21

............................................................................................................................... 23

1 ...................................................................................................................... 23

2 ...................................................................................................................... 23

3 ...................................................................................................................... 23

..................................................................................................... 24

2.1. , , .......................................................................... 26

2.1.1. ................................................................................................................. 26

2.1.2. ......................................................................................................................... 26

2.1.3. ................................................................................. 27

2.2. if else ........................................................................................................ 28

2.3. for while ........................................................................................ 29

2.4. - .............................................................................................. 30

2.5. .......................................................................................................... 33

2.5.1. ............................................................................................................................. 35

2.6. .......................................................................................................... 37

2.7. ........................................................................................................................ 40

1 ...................................................................................................................... 40

2 ...................................................................................................................... 40

4

ENOTHTA 1

1.1.1 Java ................................ 10

1.2.1 Java ............................................................... 11

1.3.1 Greenfoot .......................................................................... 12

1.3.2 (workspace) Eclipse .............................................. 13

1.3.3 To Eclipse .......................................................................... 13

1.3.4 project .................................................................................... 14

1.5.1 - ............................................................................................. 16

1.5.2 Greenfoot ................................................................ 17

1.5.3 1.5.4 .................................... 18

1.5.5 ........................................................................................ 18

1.5.6 Frog Fly ........................................................................................ 19

1.5.7 .............................................................................. 20

1.6.1 ......................................................................... 20

1.7.1 ........................................................................................ 21

1.7.2 Java .......................................................................................... 22

2.4.1 Frog ............................................................................. 31

2.4.2 ........................................................................................................... 32

2.4.3 ................................................................................................. 33

2.5.1 Actor .................................................................................... 34

2.5.2 ....................................................................................................... 35

2.5.3 greenfoot ................................................................................. 35

2.5.4 Math ........................................................................................... 36

2.5.5 ...................................................................................................... 37

2.5.6 Frog ...................................................................................... 37

2.6.1 Greenfoot .......................................................................... 38

2.6.2 JOptionPan ............................................................ 39

5

1 .......................................................................................... 26

2 ...................................................................................................... 26

3 .......................................................................................................... 27

4 ............................................................................................................. 27

5 ............................................................................. 27

6 ..................................... 32

7 ................................................. 32

7

H Java , Android . , , . , , , . : GreenFoot Eclipse. GreenFoot . , (Pascal/Python). Eclipse Java (Ant, javadoc, JUnit). Eclipse Notepad++ . , , Java () . Java Task Force (JTF) ACM /. . Java . stackoverflow Java .

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Java

Greenfoot

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1.1. Java

H Java 1995 SUN . 13 2006 Java (GPL) (javac) (JDK, Java Development Kit). 2010 Oracle Corporation Sun Microsystems ( / ) .

Java browser (applets). , Java , , , , , , .

Java Oak, . C, C++ . . Write Once, Run Anywhere (WORA). Java Windows, Linux, Unix, Macintosh , Playstation, .

Java , , java bytecode, , Java Virtual Machine. Java (Java Runtime Environment, JRE), . JRE (compiler), (interpreter).

java , Java, JRE. java (javac) java bytecode, (editor) . Eclipse http://www.eclipse.org .

1.1.1 Java

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, Java (www, 3w), , 1995. , Java applets, (web browser). , , Flash HTML5.

1.2.

. . . , . : (compiler) (interpreter). . . , - .

Java . java bytecode. , Java Virtual Machine (JVM). java bytecode .

1.2.1 Java

1.2.1 Java.

, (compiler) Java. java, .. Hello.java,

12

.class Hello.class. (acm.program) Java. , Java jar.

1.3.

1.3.1. Greenfoot

Greenfoot (IDE) Java. (actors) , .

Greenfoot :

(World), .

(Class hierarchy), ( World ctor Greenfoot). World Actor .

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1.3.1 Greenfoot

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1.3.2. Eclipse

Eclipse Java, : Ada, C, C++, Perl, PHP, Python, Ruby .. (applets). Eclipse Android Development Tool (ADT) plug in, Android.

Eclipse workspace project ( 1.3.2.1). project workspace . To Eclipse (workspace) workspace, Eclipse.

1.3.2 (workspace) Eclipse

Eclipse ( 1.3.2.2). :

Package Explorer .

Problems (Warnings) (Errors) .

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1.3.3 To Eclipse

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1.3.4 project

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1.4.

(classes) (objects or instances) .

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1 :

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1.5.2 Greenfoot

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Greenfoot :

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( ), World. . World. FrogWorld, background: cell.jpg ( 1.5.3 1.5.4).

1.5.3 1.5.4

, FrogWorld World, World (.. , ..). - Greenfoot FrogWorld World ( 1.5.5).

Greenfoot , M .

1.5.5

, . Actor, Animal () , Frog Fly. Animal , Frog Fly frog.png fly.png , animals ( 1.5.6).

19

1.5.6 Frog Fly

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, 1.5.5, FrogWorld , . . new Frog(), new Fly() ( 1.5.7). ( ) . , , .

20

1.5.7

1.6. (attributes)

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FrogEatFlies . . .

. , . : x y (int x=37 int y=209) (int rotation=0). (GreenfootImage image) (World world) ( 1.6.1). , . .

1.6.1

21

FrogWorld. Frog; , ;

1.7.

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1.7.1

( 1.7.1) - () act() (

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1.7.2 Java

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29

else if (number < 100) digits = 2; else if (number < 1000) digits = 3; else digits = 4;

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if (a != 0) { if (b > 0) { if (c < 0) { f = 1; } else { f = 2; if (b == 100) g = 9; } } }

2.3. for while

Java for while, :

while ( ) { }

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sum = 0; for (i = 1; i

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. ( ) , . , ( ) .

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int var=3; // var 3

System.out.println(++var); // var 1 var

System.out.println(var); // var

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System.out.println(var++); // var 1

System.out.println(var); // var

3 4.

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2.4. -

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Java APIs (Application Programming Interface) , Java. . JDK version 1.8 1.000 60 (packages). , . .

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java.util .

java.sql Java Data ase Connectivity (JDBC) .

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java.lang (Object, String, System)

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2.4.1 Frog

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Actor. Frog Actor , .

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move(int)

turn(int)

act()

setLocation(int, int)

setRotation(int)

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int .. move(int). int , . int . ( 2.4.2). (..:

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getRotation()

getWorld()

getX()

getY() y

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2.4.2

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2.4.3

setLocation(int, int) Frog x y . getX() x setLocation. setLocation . ;

2.5.

. (Documentation) . Java . (IDEs).

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. Actor Open Documentation , Actor ( 2.5.1).

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2.5.1 Actor

Greenfoot Greenfoot, 2.5.2.

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2.5.2

greenfoot , 2.5.3.

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2.5.3 greenfoot

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2.5.4, Math , http://docs.oracle.com/javase/7/docs/api/

2.5.4 Math

6 :

. Frog , , : (Frog) . @author @version 1.0 ( 2.5.5)

37

2.5.5

Frog. ( 2.5.5).

2.5.6 Frog

2.6.

, , (common dialogs) , . Java javax.swing (GUI). JOptionPane , . JOptionPane , documentation java : http://docs.oracle.com/javase/7/docs/api/.

JOptionPane :

38

(ConfirmDialog)

(InputDialog)

(MessageDialog)

(OptionDialog)

7 :

FrogEatFlies Greenfoot. , Frog.

Frog .

JOptionPane showInputDialog , . JOptionPane showMessageDialog .

: import javax.swing.JOptionPane;

JOptionPane javax.swing.

act move turn :

public void act() { if (Greenfoot.mousePressed(this)) { String inputStr = JOptionPane.showInputDialog(" , ;"); JOptionPane.showMessageDialog(null, " " + inputStr + "\n OK

Enter ."); }

. , Frog new Frog (), Frog . . , 2.6.1.

2.6.1 Greenfoot

39

act (2) .

import javax.swing.JOptionPane; public void act ( ) { String x = JOptionPane.showInputDialog(" "); String y = JOptionPane.showInputDialog(" "); int number1 = Integer.parseInt(x); int number2 = Integer.parseInt(y); int sum = number1 + number2; JOptionPane.showMessageDialog(null, " " + sum, " ", JOptionPane.PLAIN_MESSAGE);

}

2.6.2.

2.6.2 JOptionPan

PLAIN_MESSAGE :

.

40

2.7.

1

1000 . / JOptionPane

2

JOptionPane .

Γ ΕΠΑΛ ΕΙΔΙΚΑ ΘΕΜΑΤΑ ΣΤΟΝ ΠΡΟΓΡΑΜΜΑΤΙΣΜΟ ΚΕΦ1 2

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