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1 BlueJ BlueJ 2.0.x Michael Kölling Mærsk Institute University of Southern Denmark Toin University of Yokohama Alberto Palacios Pawlovsky

3 BlueJ Windows Macintosh Linux/Unix BlueJ

3.............................. 10 3.4........................................... 12 3.5.................................... 13 3.6.................................... 14 3.7............................ 15 4 17 4.

4 Halt Terminate BlueJ main

3................................ 34 10 35 10.1 BlueJ............................. 35 10.2......................... 35 10.3 main................. 35 10.4..................................... 36 10.

5 BlueJ BlueJ BlueJ Java T M Deakin Kent BlueJ BlueJ Java Java Java BlueJ The BlueJ Environment Reference Manual BlueJ BlueJ M. Kölling J. Rosenberg BlueJ 1.4 BlueJ Michel Kölling [email protected]

7 7 2 BlueJ Windows MacOS BlueJ J2SE 1.4 JDK1.4 JDK Sun Web MacOS JDK JRE Java Runtime Environment SDK Software Development Kit SDK JRE 2.1 Windows Windows bluejsetup-xxx.exe xxx BlueJ bluejsetup-200.exe BlueJ Web bluej.exe BlueJ Java JDK Java JDK1.4.2 JDK1.5.0 Java JDK BlueJ vmselect.exe BlueJ Java Java Java BlueJ BlueJ JDK1.4.2 JDK1.5 BlueJ Java BlueJ Java 2.2 Macintosh BlueJ MacOS X

1 Windows Windows bluejsetup-xxx.exe xxx BlueJ 2.0.0 bluejsetup-200.exe BlueJ http://www.blue.org/ Web bluej.

8 8 2 MacOS BlueJ-xxx.zip xxx BlueJ BlueJ BlueJ-200.zip BlueJ Web MacOS BlueJ.xxx 2.3 Linux/Unix jar bluej-xxx.jar xxx BlueJ bluej-200.jar BlueJ Web bluej- 200.jar <j2se-path>/bin/java -jar bluej-200.jar < j2se path > J2SE JDK BlueJ BlueJ JDK Install BlueJ 2.4 BlueJ Web FAQ How To Ask For Help bluej.org/help/ask-help.html

jar <j2se-path>/bin/java -jar bluej-200.jar < j2se path > J2SE JDK BlueJ BlueJ JDK Install BlueJ 2.

9 BlueJ Windows MacOS BlueJ Unix bluej GUI BlueJ $ bluej $bluej examples/people 3.1: BlueJ

10 Project Open BlueJ Java BlueJ Project Open... BlueJ examples people examples BlueJ BlueJ BlueJ main Java main Java Database Person Staff Student Macintosh control new Staff Staff 3.2 Staff 3.3 staff1 Ok Staff MacOS control+

3 BlueJ BlueJ main Java main Java Database Person Staff Student

11 : 3.3: Person << abstract >> Java

12 3 3.4: 3.4 public Java 3.5 Inspect Remove 3.5: Staff setroom getroom getroom 3.

12 : 3.4 public Java 3.5 Inspect Remove 3.5: Staff setroom getroom getroom 3.6 (unknown room) Object Person 3.5 Person getname (unknown name) getroom getname setroom 3.7

13 : 3.7: String Ok getroom 3.5 Open Editor Staff

14 14 3 getroom M.3.18 room M.3.18 return room return room; return "room " + room; BlueJ Java 3.6 Compile Compile Staff BlueJ Compile Compile Compile

15 Compile : BlueJ

17 4 BlueJ 4.1 3.5 Inspect Staff Inspect 4.1 4.

17 17 4 BlueJ Inspect Staff Inspect : Staff String BlueJ people2 people Address Person Address

18 : people2 Staff setaddress Person Staff Address address Staff 4.3 Staff address address 4.3: address

4.2. 19 address address Inspect address Address 4.4 4.4: public Inspect address Get 4.

19 address address Inspect address Address : public Inspect address Get 4.2 Database Database Database Person Person Person Staff Student Database Staff Student Database addperson Person Person Person Student Staff Person Person Student Staff

20 20 4 Ok Database listall listall Person

21 Project New... Project New... Ok 5.2 New Class... New Class... Java abstract interface applet standard abstract abstract interface applet 5.3 extends implements uses

22 22 5 extends implements uses extends implements import uses 5.4 Remove Edit Remove Remove Remove

23 23 6 BlueJ Java Java 6.1 View Show Code Pad View Show Code Pad 6.1 Enter 6.1: 6.2 Java

24 "hello".length() Math.max(33, 4) (int) 33.7 javax.swing.joptionpane.showinputdialog(null, "Name:") Java student student1 student1.getname() 6.3 object reference : new Student() "marmelade".substring(3,8) new java.util.random() "hello" + "world" 6.3

25 : Java System.out.println("Gurkensalat"); System.out.println(new java.util.random().nextint(10)); 6.6 shift-enter shift-enter shift-enter Enter for for (int i=0; i<5; i++) { System.out.println("number: " + i); } 6.7

26 26 6 int sum; sum = 0; for (int i=0; i<100; i++) { sum += i; } System.out.println("The sum is: " + sum); sum Java 6.8

27 27 7 BlueJ 15 BlueJ examples debugdemo STOP Demo loop STOP Demo loop

28 : 7.2: 7.2 Step Step Into Step Step sum Continue

29 Demo cartest() places = mycar.seats(); cartest() Car seats() Step Step Into Step Into Car seats() Step Step Into 7.3 BlueJ cartest() Car.seats Demo.carTest Car.seats Demo.carTest Demo.carTest new Car(...) mycar < object reference > String Halt Terminate Halt Terminate

30 30 7 Demo longloop() Halt Step Continue Halt Terminate Terminate Terminate

31 31 8 Project Create Jar File... BlueJ jar jar Windows MacOS java -jar <file-name>.jar Unix DOS Hello Hello examples Project Create Jar File main public static void main(string[] args) 8.1: Create Jar File Hello main jar

32 32 8 BlueJ Preferences/Libraries lib/userlib Include user Libraries Continue jar hello Create hello.jar hello hello.jar jar jar GUI jar jar DOS jar hello.jar Java java -jar hello.jar

33 Run Applet BlueJ BlueJ examples examples appletdemo CaseConverter << applet >> Run Applet : Run Applet Ok CaseConverter J2SE JDK Java Java

34 34 9 Java Microsoft Windows MacOS BlueJ UNIX BlueJ 9.2 New Class Applet Applet New Class paint 9.3 BlueJ Michael Trigoboff AppletWindow BlueJ BlueJ resources

35 BlueJ BlueJ Project Open Non BlueJ... BlueJ BlueJ Project Open Non BlueJ... Java Open in BlueJ 10.2 Add Class from File... BlueJ Java Edit Add Class from File... Java.java BlueJ 10.3 main examples hello Hello main main main main String Java main String

36 36 10 {"one", "two", "three"} Java BlueJ 10.4 Tools Project Documentation BlueJ javadoc Tools Project Documentation BlueJ Implementation Interface javadoc 10.5 Java API Help Java Standard Libraries Java Java Help Java Standard Classes JDK API JDK BlueJ 10.6 Tools Use Library Class BlueJ String ArrayList Tools Use Library Class java.lang.string Enter Return

37 Project Open Compile Compile Project New New Class Remove 13. View Show Code Pad 14. Java 15.

38 shift-enter Step Step Into Halt Terminate 25. Project Create Jar File Run Applet 27. New Class Applet 28. BlueJ Project Open Non BlueJ Add Class from File Tools Project Documentation 32. Java API Help Java Standard Libraries 33. Tools Use Library Class

Java updated

Java updated Java 2003.07.14 updated 3 1 Java 5 1.1 Java................................. 5 1.2 Java..................................... 5 1.3 Java................................ 6 1.3.1 Java.......................