دوسية جافا

.C³‫ ا‬45 4?_ ‫د ا‬T ‫ ' أن 'ن ا‬vp 52 ‫ ا‬45 ‫د‬T ‫  ا‬V'1 :HZ [ .y? ‫ل ا‬T ‫ ا‬45 ‫ آ‬V'‫د‬%% static ‫ع‬.  D2‫و‬E‫رج ا‬C 4‫ ه‬4 ‫د ا‬T ‫ ان ن ا‬2' 2D Arrays( ‫ه‬9;a¢‫ت ذات ا‬9:I°.‫ )ا‬: .6p‫ ا ا‬A20‫ ذات ا‬5+¢ ‫ ا‬T ª+% ‫ ا اآة‬45 T ‫ و‬52 ‫ ا‬45 ‫ه‬2‫ ذات ا‬5+¢ '  t?. :‫ه‬20‫ ذات ا‬5+¢ ‫ل  ' ا‬T int[][] a = new int[2][4];  V ‫أو‬ int[][] a = {{1,2,4,7},{-1,5,8,9}}; .‫ و ر ا د ا اد‬¢ ‫* ر ا‬. 5+¢ ‫ ا‬45 .C < ‫ل‬z)

:‫ل‬T int[][] a= {{1,2,4,7},{-1,5,8,9}}; int x = a[0][3]; .7 ‫ ?وي‬x  D;z‫ أ‬%‫ه‬ 1

2

4

7

-1

5

8

9

Comments and Documentation(‫ت‬9`Mb.‫ت و ا‬9Z [.‫)ا‬: ‫ون‬C³‫ن ا‬2; ‫ ا‬t?' 4 ‫ت‬YpS ‫ ا  )<ت أو ا‬A‫  ه‬vp 52 ‫ ا‬45 ‫  ا  )<ت‬9. ‫ك‬%‫ه‬ ‫ن‬79% ‫ان ا‬7‫\ و ه‬.; ‫ ا‬9 45 ‫ا‬6‫ § أ‬1‫\ و‬.; ‫ ا‬V5 ‫م‬6>? ‫ ا‬t?' 4 ‫د أو‬T  A%;‫  آ‬V5 :‫ه‬ Comments : ‫ي‬7 ‫\ ا‬7.; ‫اءة ا‬7 \7; ‫ ا‬t?7 7 ‫ و‬/*.....´µMb.‫ا‬......*/ 7 ¢7 ‫ أو‬// ‫رة‬7•0‫ ا‬67  7 ‫و‬ .UV5 ‫ و‬A%;‫آ‬ Documentation: .\.; ‫ ذا '  ا‬V+' ‫م‬6>? ‫  ا‬2 V% ‫ة‬6_+ ‫ وا‬/**........‫ة‬9 .‫ا‬.......*/   ‫و‬ . javadoc @? ‫ و‬D..‫ ا‬+z V% 9 ‫ اءة ا  )<ت و‬t? 53 45 ‫ك أدوات‬%‫ ه‬:HZ [ :‫ل‬T /**class to print star @auther : Abdallah Ahmad @company : al quds university @version 1.0 */ class star{ public static void main(String[] args){ System.out.print("*"); //print star } } 77Y% ‫ و ا‬77 ‫ة ا‬779‫ ا‬772' 7752  772; ‫ ا‬.‫ا‬77 4775 v77p 77V‫ه‬E ‫ت‬77<)  ‫ ا‬77‫ آ‬772' 7752 ‫ ا‬4775 .6p‫ وا‬t 45 )9  T‫م آ أآ‬69 4% ' ‫ و‬side effect ‫ام‬6> ‫م ا‬69 ‫\ و‬.;)

:‫ل‬T i=23+22;b=13%67;

side effect

475 7)9 7‫ آ‬7‫ و‬72' [  \.; ‫ ا‬+% 6%9 U ¢p 6%9 «;*  |t> ‫  ا‬5  [ ‫و ا   ذ‬ .‫ه‬6p‫ و‬t .\.; ‫ ا‬V5 V? ‫س‬S ‫وا أو ا‬E‫د أو ا‬T ‫ ا‬¢p 45  ‫ة ا‬9‫ ا‬2' ‫آ‬

:‫ل‬T class star { | public static void main(String[] args) | { | | System.out.print("*"); | } } .Constructor ‫ و ال‬field ‫د و ال‬T ‫ دا_ ; ا‬Documentation ‫  ال‬:HZ [ : OOP Hn` H; .‫ ا‬HI‫آ‬:9ً X.9T .‫  ا  )ت‬92 ‫ ه‬object ‫ ال‬:‫ة‬+ ‫ا‬ Fields: ‫ء‬7% 7.‫ أرد‬7%.‫ أ‬7 ST7 D72‫و‬E‫ت ا‬+7z 7 47‫\ و ه‬7.; ‫  ا‬V3. 4 ‫ ا  )ت ا‬9 ‫;رة‬9 4‫و ه‬ .US9 ‫ و‬4 2 ‫ ا‬U‫ و ر‬U ‫ ا‬T t ‫ ا‬9 ‫ج  )ت‬. t) D2‫أو‬ :‫ل‬T class Student{ /**String‫ع‬.  ‫ و ه‬t ‫*ا  ا‬/ public String name; /**double‫ع‬.  ‫ و ه‬4 2 ‫*ا  ا‬/ public double id; /**int ‫ع‬.  4‫ و ه‬S ‫*ا‬/ public int mark; } Constructor: U7 67'63 D72‫ أو‬%  ' vp U‫ا‬6> ‫ ا‬%)9 2' D2‫ء أو‬% ‫ج‬. 6%9 D2‫و‬E‫ ا‬4. 9 ‫;رة‬9 ‫ه‬ .U% 4% ‫ ا ي‬D2‫و‬E‫ت ا‬+z .U5 ‫س ا  ل‬S ‫ ا  ا‬ª+. Constructor ‫'ن ا  ال‬ :‫ل‬T class Student{ /**String‫ع‬.  ‫ و ه‬t ‫*ا  ا‬/ public String name; /**double‫ع‬.  ‫ و ه‬4 2 ‫*ا  ا‬/

public double id; /*int ‫ع‬.  4‫ و ه‬S ‫*ا‬/ public int mark; /**Constructor of Student Object*/ public Student(){ } } class StudentTest{ public static void main(String[] args){ Student abdallah = new Student(); abdallah.name ="abdallah"; abdallah.id = 20111017; abdallah.mark = 80; System.out.print(abdallah.name+abdallah.id+"["+abdallah.mark+"]"); } } D2‫و‬E Constructor  T‫ك أآ‬%‫  را و' آا [ أن 'ن ه‬Constructor ‫' أن 'ن ال‬ .Overloading   ‫ ا‬A‫د ا ;را و ?@ ه‬6  ‫ف‬SCE‫ و 'ن ا‬6p‫وا‬ ‫ء‬7% 7 ' v7p (Default Constructor)47‫ا‬50‫ ا‬4.; ‫ را ا‬U ª ‫ ا ي‬Constructor‫'?@ ال‬ .‫ و 'ن دا_ ب‬Fields  ‫ء‬t9‫ دون ا‬D2‫ ˆو‬ :‫ل‬T class Student{ /**String‫ع‬.  ‫ و ه‬t ‫*ا  ا‬/ public String name; /**double‫ع‬.  ‫ و ه‬4 2 ‫*ا  ا‬/ public double id; /*int ‫ع‬.  4‫ و ه‬S ‫*ا‬/ public int mark; /**Default Constructor of Student Object*/ public Student(){ } /**Constructor of Student Object with parameter */ public Student(String aName,double aId,int aMark){ name = aName; id = aId; mark = aMark; } } class StudentTest{ public static void main(String[] args){

Student abdallah = new Student("abdallah",20111017,80); System.out.print(abdallah.name+ abdallah.id+"["+ abdallah.mark+"]"); } } \_7. %t  )t ‫د ا‬T ‫)@ ا  )ت و ا‬9 ‫ ه ا ي 'ي‬vp D2‫و‬E‫)@ ا‬9 _‫ ا آ( دا‬52 ‫ ا‬45 .‫ ا  )ت‬A‫ه‬ 7%< ‫م‬6>?7 1 ‫« و‬7<5 D72‫و‬E‫ ا‬7C‫ دا‬47 ‫د ا‬7T ‫ ا‬7+% 7‫ أوا‬79 ‫رة‬7;9 7‫ ه‬752 ‫ ا‬475 4?7_ ‫د ا‬T ‫ا‬ . c 8 45 T 52 ‫ ا‬45 X%+ ‫ا‬ Public / Private: Public: 475 ‫ و‬7Cw ‫س‬S7‫ أي آ‬475 V‫ا‬6>7 ‫ ا‬t?7. D2‫و‬E‫ ا‬4. ‫ أو‬6)+ ‫د أو ا‬T ‫ ; ا‬public )‫ و آ‬6%9 ‫ أي‬7 ‫ن‬E ; 7z ‫ا‬7‫ ا‬VT'67 7‫  ا‬2' [ ‫•ء و ذ‬E‫ ا‬AV documentation ‫ آ ال‬2'   ‫ ا‬A‫ه‬ A7‫ ه‬7  ‫ذا‬7 ‫م‬6>?7 ‫ف ا‬7 ' S75 ® C V%9 ‫ ا ي آ‬y)  ‫;¨ ا‬¢' [  ‫ و‬VV+ 8' ‫ أن‬V v'6 .«;*  ‫•ء‬E‫ا‬ Private: 1 ‫ و‬U75 D759 47 ‫س ا‬S7 ‫ ا‬7 1‫ ا‬V‫ا‬6>7 ‫ ا‬t?7. 1 private (....,67)5,‫د‬T)<? ‫•ء ا‬E‫ ا‬D.‫اذا آ‬ ‫ و‬private 5  6)5 D2‫و‬E‫ ا‬45 _‫م دا‬6>?. [ ‫ و ا‬V VT'6 ‫ و  [ 'ن أ‬y)  ‫ج  ا‬. . public 5  ‫د‬T Accessor and Mutator: : ‫د' و ه‬T ‫  ف‬6)5  ‫ك‬%‫ دا_ ه‬D2‫و‬E‫ ا‬45 Accessor: ‫ون‬67 7‫ و ه‬67)+ ‫ ا‬7 73'‫ و‬get 7) U ‫أ دا_ ا‬6;' ‫ و‬6)+ ‫ ها ا‬C‫ دا‬.(> ‫ل )< ا‬z) ‫م‬6>?' ‫و‬ .‫را‬ Mutator: .  3' 1  ‫ را و‬U ‫ و‬set ) U ‫أ دا_ ا‬6;' ‫   و‬6)5  8 ‫م‬6>?' ‫و‬

:‫ل‬T class Student{ private String name; private double id; private int mark; /**Default Constructor of Student Object*/ public Student(){ } /**Constructor of Student Object with parameter */

public Student(String aName,double aId,int aMark){ name = aName; id = aId; mark = aMark; } /**accessor to name*/ public String getName(){ return name; } /**mutator to name*/ public void setName(String aName){ name = aName; } /**accessor to Id*/ public double getId(){ return id } /**mutator to Id*/ public void setId(double aId){ id = aId; } /**accessor to Mark*/ public int getMark(){ return mark; } /**mutator to Mark */ public void setMark(int aMark){ mark = aMark; } } class StudentTest{ public static void main(String[] args){ Student abdallah = new Student(); abdallah.setName("abdallah "); abdallah.setId(20111017); abdallah.setMark(80); System.out.print(abdallah.getName()+abdallah.getId()+abdallah.getMar k()); } } . abdallah 20111017 80 : ‫’وج‬.‫ا‬ . 3' 1 U.‫ أ‬4% ' ‫د ها‬T ‫ ; ا‬void )‫ و آ‬6%9 :HZ [

toString Mithod: .String ‫ع‬.  V 3' 4 ‫ و ا < ا‬D2‫و‬E‫ ا‬9 ‫  )ت‬% 3' ‫د‬T 9 ‫;رة‬9 ‫ه‬ [ 7 ‫اآة و‬7 ‫ ا‬475 ‫ان‬7%9 7% 73' U‫دا‬% 6%9  ‫ا و‬5‫د ا‬T ‫د ها ا‬3 ‫ 'ن‬D2‫و‬E‫ء ا‬% 6%9 .U‫دة آ‬90 _‫ج دا‬. class Student{ private String name; private double id; private int mark; /**Default Constructor of Student Object*/ public Student(){ } /**Constructor of Student Object with parameter */ public Student(String aName,double aId,int aMark){ name = aName; id = aId; mark = aMark; } /**accessor*/ public String getName(){ return name; } /**mutator*/ public void setName(String aName){ name = aName; } /**accessor*/ public double getId(){ return id } /**mutator*/ public void setId(double aId){ id = aId; } /**accessor*/ public int getMark(){ return mark; } /**mutator*/ public void setMark(int aMark){ mark = aMark; }

/**toString Method*/ public String toString(){ return "Name"+name+","+"ID:"+id+","+"MARK:"+mark; } } class StudentTest{ public static void main(String[] args){ Student abdallah = new Student("abdallah ",20111017,80); System.out.print(abdallah.toString()); } } Name: abdallah, ID: 20111017 , MARK: 80 :‫’وج‬.‫ا‬ ‫د‬T ‫م ا‬6>?' D2‫و‬E‫ أي ا  ا‬abdallah «<5 abdallah.toString ‫ل‬6 9;t ‫ أ ا‬45 %;‫اذا آ‬ . ً_<) toString :‫ل‬T System.out.print(abdallah); :V?+. 4‫ه‬ System.out.print(abdallah.toString()); Name: abdallah, ID: 20111017 , MARK: 80 :‫’وج‬.‫ا‬ '  ‫س و‬S ‫ ا‬ª+.  5  ‫ ا‬D2‫و‬E‫   ا‬U ‫ن‬5 static ‫ع‬.  6)+ ‫اذا آن ا‬:HZ [ .3 ‫ ا‬6%9 U 8 :‫ل‬T class Student{ private String name; private double id; private int mark; private static int nextId=5; . . . } class StudentTest{ public static void main(String[] args){ Student abdallah = new Student("abdallah ",20111017,80); Student hamzeh = new Student("hamzeh",20111159,80); System.out.print(abdallah.getNextId()+" , "hamzeh.getNextId()); } } .5 , 5 :‫’وج‬.‫ا‬ Constant(9X.‫ )ا‬:

) ‫ام ا‬6>  [ ‫ و ذ‬DT‫م آ‬6>?' .‫\ و ا‬.; ‫ ا‬45 U 8 ' 1 < ‫ ا‬D 6)5 '  t?. .final 5  ‫ا‬ :‫ل‬T class StudentTest{ public static final String a="NAME : "; public static void main(String[] args){ Student abdallah = new Student("abdallah ",20111017,80); Student hamzeh = new Student("hamzeh",20111159,80); System.out.print(a+ abdallah.getName()); } } .NAME : abdallah :‫’وج‬.‫ا‬ :‫Šاآة‬.‫ ا‬+: -;‫و‬m‫ ا‬sXa :y? ‫ل ا‬T ‫ ا‬45 abdallah D2‫و‬E‫   ا‬ST ‫ ا اآة‬45 D2‫ ˆو‬4)T  ‫' ر  ر‬

Student abdallah

Student String name

String

double id=20111017 int mark=80

" abdallah "

. String -;‫و‬m‫™ ا‬.‫ ا‬hO¹.‫  ا‬h±O 9nO‫Ÿ ر‬.Š. -;‫رة  أو‬9  ‫ ه‬String ‫ ال‬: HZ [ Input and Output: y'  9 )C6 ‫ ' ا <;ل ا  )ت ا‬vp (Stream)‫ى‬2 @? ‫اج‬C0‫ل و ا‬C‫د‬0‫ أدوات ا‬52 ‫ ا‬45 :4  ‫ى آ‬2 Buffered Reader

Input Stream Reader

System in

input

:a9I.‫ ا‬H .  H_‫`ا‬.‫ا‬ :‫)@ و ه‬9E‫ ا‬45 4 ‫رة ا‬¢ ‫ ا‬45 ‫( آ‬3 Stream) .‫ أ‬3 ‫ج‬. ¨+ ‫ ا‬p _‫ )<ا‬

System in: .‫ آ ة‬45 6p‫ وا‬D' _‫)@ ا‬9  ' ‫ول و‬E‫;ب ا‬.E‫و ه ا‬ Input Strem Reader: .(‫ف أو ر‬p @ ‫ ا‬D' 2 ‫)@ ' آ‬9  ' ‫و‬ Buffered Reader: .(String))?) V%  § ‫ ذاآة‬45 ‫ ا وف أو ا ز‬A‫ ه‬2 @)9  ' ‫و‬ :‫ل‬T BufferedReader in = new BufferedReader(new InputStreamReader(System.in)); U7777777 BufferedReader ‫س‬S777777 ‫ و ا‬BufferedReader ‫س‬S7777777 ‫ع ا‬777777. 7777777 777777‫ ه‬in ‫رئ‬7777777< ‫ ا‬777777%‫ه‬ ‫ و‬System.in 7  ‫ ا‬U7 InputStreamReader ‫س‬S ‫ و ا‬InputStremReader (parametr)  ‫ا‬ .¨+ ‫ ا‬p  D' _‫س )<ا‬S‫ه آ‬ .¨+ ‫ ا‬p  ‫ف‬pE‫ف أو )?)  ا‬p _‫ى <ا‬2 T ‫ل‬T ‫ ا‬45 ‫ آ‬V*   4‫و ه‬ .A8 '  ‫د ا‬2 ‫ ه‬in : HZ [ Try And Catch: ‫ب‬3 4%  ‫ و‬catch ‫ و‬try ) ‫ أوا ا <ا_ و ا   ا‬¢ 52 ‫ ا‬45  ‫)ت ا <ا_ و ا‬9 6%9 @?77 ‫ء‬77tCE‫ و ا‬, 77) ‫ ا‬4775 ‫ح‬772% ‫م ا‬6779 4775 ;?77 ‫ي‬77 ‫| ا‬77t> ‫?[ ا‬77|5 ¨2%77 77 ‫ و اذا‬77 ‫اءة أو ا‬77< ‫ا‬ ST ‫ل و ا >وج أو‬C6 ‫(ة ا‬V3‫ ا‬45 |tC 4%  ‫ و‬IOException : T ‫ة‬6'69 ‫اع‬.‫ك أ‬%‫" و ه‬Exception" .(int,long,…..)‫ ا @ ر‬String  ' ‫ء ا‬tC‫ أ‬4‫ و ه‬NumberFormatException :‫ل‬T try{ BufferedReader in = new BufferedReader(new InputStreamReader(System.in)); String s = in.readLine(); //¨+ ‫ ا‬p  t ‫'<أ‬ }catch(Exception e){ .......HMb.‫ ا‬+: |}~ ‫ك‬9n‫ن ه‬9‫ إذا آ‬sbI/ ‫ أن‬/ ‫ذا‬9...... } .\.; ‫ أن '?[ ا‬2' ‫ء‬tCE‫ع  ا‬. ‫د أي‬6.  ‫م أي‬9 |tC 4‫ ه‬e .A8 '  ‫ ه ا‬e :‫• ها‬X ‫)@ ا‬9 |t> ‫ ا‬9;  t?. try{ BufferedReader in = new BufferedReader(new InputStreamReader(System.in)); String s = in.readLine(); }catch(Exception e){ System.out.print(e); //º E.9 |}’.‫ ا‬9n.  }/ } ‫ة‬6p‫ ة وا‬U+'  ' in ‫ ا <رئ‬y? ‫ل ا‬T ‫ ا‬45 ST , ‫س‬S ‫ ا‬45 ‫ة‬6p‫ '  ' ا <رئ ة وا‬:YpS .‫س‬S ‫ ا‬45

:gM  H_‫`ا‬.‫ا‬ '  ‫ 'ن‬vpFileReader ‫س‬S ‫ ا‬y'  9 (text file) 4¢. )  52 ‫ ا‬45 _‫ ا <ا‬t?. :4  ‫ا <رئ آ‬ BufferedReader r = new BufferedReader(new FileReader("c:\myFile.txt")); ) ‫ ا‬U5 ‫د‬3 ‫ ا ?ر ا ي‬9 ;  ‫ )?) و‬9 ‫;رة‬9 ‫ ه‬FileReader ‫س‬S) (parameter)   ‫ا‬ :ST "c:\myDocument\doc\+IM.txt" :gM +: }Om‫ ا‬b/ §9 ‫ل‬9X class CountFileLine{ public static void main(String[] args){ try{ BufferedReader r = new BufferedReader(new FileReader("c:\myFile.txt")); String s; int count=0; //int ‫ع‬.  ‫ و ه‬t E‫ ?ب ا‬8 while((s = r.readLine())!=null) //) ‫' ا‬V. @p t t ‫'<أ‬ count++; r.close(); //) ‫ق ا‬S0 System.out.print("The Number Of line in this file is : "+count); }catch(Exception ee){ System.out.print("error when reading file : \n"+ee); } } } .‫ء‬+¡ 7 4%  ‫ و‬52 ‫ ا‬45 5  )‫ آ‬4‫ ه‬null :HZ [ ‫ و ه‬PrintWriter ‫س‬S ‫ ا‬V% ‫م ) و‬6>? 4 ‫س ا‬S ‫اع  ا‬.E‫  ا‬6'6 ‫ك ا‬%‫ ه‬:gM +: H9-.‫ا‬  ‫ ه‬C³‫ آ  و ا   ا‬FileWriter ‫س‬S ‫م آ [ ا‬6>?' ‫)@ ا ) آ [ و ه‬9 '6   ¨?' ‫ '<م‬S5 false D.‫)ب ا اذا آ‬t ‫)@ ا ) ا‬9 5‫ '  ا‬true < ‫ ا‬% ‫ اذا و‬vp Boolean ‫ع‬. .A ' ‫ و‬y? ‫ ا ) ا‬45  ¨?' .‫ و ا‬50 :gM +: 9±ˆ’/ ‫م و‬9‫ أر‬10 a9I.‫ ا‬H .  ‫`أ‬/ §9 ‫ل‬9X public class PrintWriterTest { public static void print(int[] a){ try{ PrintWriter out=new PrintWriter(new FileWriter("c:\ out.txt",false)); for (int i=0;i
}catch(IOException e){System.out.println(e);} } public static void main(String[] args){ int[] a=new int[10]; String l; BufferedReader b=new BufferedReader(new InputStreamReader(System.in)); System.out.println("ENTER TEN NUMBER: "); try{ for (int i=0;i' ST7 ?73 ‫ ا‬7   ‫ب و‬S7  7‫ ه‬7'V% ‫ ا‬45 ‫ن‬%0‫ ر'س و ا‬ ‫ ر'س‬7‫ب ا ;آ‬S7  D72‫ أو‬7 %?73 ‫ب ا‬S7t 4795 D72‫ أو‬79 t?7. [ 7 ‫ت‬+7z‫ ا ا‬Å  .super class ‫ ب‬4)zE‫س ا‬S ‫ و ا‬sub class ‫ ب‬49+ ‫س ا‬S ‫ '?@ ا‬vp SuperClass Bacalorious Student

SubClass Master Student

Name Id Mark Avrage

BaAvrage

hµ±.  µj9.‫[ب ا‬µ}. µ-. ‫ و‬+µ‫اآ‬a ‫ل‬µb ‫ و‬Hµ[ ‫ و‬+b9µj hµ‫ و ر‬hµO‫ ا‬hµ±. ‫}[ب‬.‫ ا‬s‫رة آ‬°.‫ هŠ½ ا‬+: .‫}[ب‬.‫ و ه ا‬+ _.‫ ا‬-;‫و‬m‫  ا‬+: -;‫ او‬h±. 9nb£ ‫Ÿ و‬.‫Šا‬. +:9£‫ل ا‬b :4  ‫ آ‬495 ‫س‬S‫  آ‬extends )‫م آ‬6>? class MasterStudent extends Student{ 4?_ ‫س ا‬S ‫ا  ا‬

} :‫ل‬T :(super class)4?_ ‫س ا‬S ‫ا‬ class Student{ private String name; private double id; private int mark; /**Default Constructor of Student Object*/ public Student(){ } /**Constructor of Student Object with parameter */ public Student(String aName,double aId,int aMark){ name = aName; id = aId; mark = aMark; } /**accessor to name*/ public String getName(){ return name; } /**mutator to name*/ public void setName(String aName){ name = aName; } /**accessor to Id*/ public double getId(){ return id } /**mutator to Id*/ public void setId(double aId){ id = aId; } /**accessor to Mark*/

public int getMark(){ return mark; } /**mutator to Mark */ public void setMark(int aMark){ mark = aMark; } } :(sub class)49+ ‫س ا‬S ‫ا‬ class MasterStudent extends Student{ double BaAvrage; public MasterStudent(){ } public MasterStudent(String aName,double aId,int aMark,double aBaAvr){ super(aName,aId,aMark); //‫[ت‬9b.‫¾ ا‬I o. ‫Šي‬.‫ ا‬+ _.‫[س ا‬-.‫ ا‬+: +9 .‫  ’م ا‬9n‫ه‬ BaAvrage = aBAvr; } public void setBaAvrage(double average){ BaAvrage = average; } public double getBaAvrage(){ return BaAvrage; } public String toString(){ return "Master Student :\n"+super.toString+"BaAvrage= : "+getBaAvrage; } } class StudentTest{ public static void main(String[] args){ Student abdallah = new Student("abdallah ",20111017,80); MasterStudent amjad = new MasterStudent("amjad",9711123,84,78); System.out.print(abdallah.toString()+"\n"+amjad.toString()); } }

this and super: .U5 ‫دة‬3 4‫ ه‬4 ‫س ا‬S ‫)@ ا‬9 ‫ل‬65 this  ‫ا‬6 ‫ أ ا‬4?_ ‫س ا‬S ‫)@ ا‬9 ‫ل‬6 super  ‫ا‬6 ‫ا‬ : <'t super  ‫ا‬6 ‫ ا‬ST ‫ام‬6> ‫ ا‬t?. ‫و‬ :4  ‫<« و  آ‬5 ‫ول‬E‫ ا‬t? ‫ ا‬45 V‫ا‬6>% ‫ '?¨ ا‬vp (constructor)4.; ‫ ا‬45 -1 super(‫ت‬S  ‫)ا‬ .y? ‫ل ا‬T ‫ ا‬45 ‫ت آ‬S  ‫ ا‬ª+. U ‫ ا ي‬4.; ‫م ا‬6>?' ‫ و‬4?_ ‫س ا‬S ‫ ا‬45 4.; ‫ 'ه ا @ ا‬vp 77 ‫ا‬6 ‫ ا‬A7‫ام ه‬6>7  4779+ ‫س ا‬S7 ‫ ا‬475 4?7_ ‫س ا‬S77 ‫ ا‬7 ‫د‬7T ‫ام ا‬6>7 ‫ ا‬t?77. v7p ‫د‬7T ‫ ا‬475 -2 :4  ‫آ‬ super.‫د‬T ‫ا  ا‬ . MasterStudent ‫س‬S ‫ ا‬45 toString ‫د‬T ‫ ا‬45 y? ‫ل ا‬T ‫ ا‬45 ‫آ‬ ‫ اذا‬v77p «77<5 ‫س‬S77 ‫ ا‬77C‫م دا‬6>?77 this 77 ‫ا‬6 ‫ ا‬77 77<'t ‫ ا‬ª+%77 [ 77‫ آ‬this 77 ‫ا‬6 ‫ام ا‬6>77 ‫ ا‬t?77. ‫و‬ :4  ‫ آ‬4.; ‫ ا‬45 ‫ه‬% ‫و‬ this(‫ت‬S  ‫;)ا‬ .U?+. ‫س‬S ‫ ا‬45 ‫ت‬S  ‫ ا‬ª+. U ‫ ا ي‬4.; ‫'ه ا @ ا‬ :ST  ‫ ا ي ار‬D2‫و‬E‫)@ ا‬9 ‫ل‬6 ‫?اآر و‬. ‫ ا‬45 V‫ آ‬t?. ‫آ‬ public Student(String name){ this.name = name; } : 4  ‫د آ‬T  ‫ ا‬45 D2‫ او‬%% %.‫  ا‬vp Student abdallah = new Student("abdallah "); .‫ و ا ;را‬6)+ ‫  ا‬y'+ ‫ ا‬t?' [  ‫ و‬abdallah D2‫ ˆو‬name 6)+ ‫)@ ا‬9 4.; ‫ ا‬45 this ‫ل‬6 :9:9;.‫© ˆات ا‬b Overriding(Hn±.‫)ا‬: .4?_ ‫س ا‬S ‫ ا‬45 ‫د‬3 ‫ ا‬49+ ‫س ا‬S ‫ ا‬45 ‫ت‬S  ‫ ا‬ª+. U ‫د و‬T ‫ ا‬ª+. ‫ آ‬52 ‫ ا‬45 t?. Polymorphism(H/‫د‬b.‫)ا‬: ‫ع‬.  D2‫ ?واة  أو‬9 t?. y? ‫ل ا‬T ‫ ا‬45 ST D2‫  ˆو‬3 9 52 ‫ ا‬45 t?. :4  ‫ آ‬49+ ‫س ا‬S ‫ع ا‬.  D2‫ |و‬4?_ ‫س ا‬S ‫ا‬ MasterStudent y = new MasterStudent(); Student x = y; .4?_ ‫س ا‬S ‫ع ا‬.  U.E x D2‫ ˆو‬49+ ‫س ا‬S ‫ ا‬C‫دة دا‬3 ‫د ا‬T ‫ام ا‬6> ‫ ا‬t?. 1 %‫ه‬ .‫ب‬St ‫  ا‬5+¢   z> ‫ ا‬A‫  ه‬6+?. :‫ل‬T Student[] std = new Student[2]; std[0] = new Student(); std[1] = new MasterStudent(); Dynamic Binding(+-9n/.‫ ا‬º.‫)ا‬: ‫د‬T ‫ام ا‬6> ‫ ا‬45  3 ‫ 'ن ا‬y? ‫ل ا‬T ‫ ا‬45 T ‫ ?واة‬%)9 ‫ اذا‬vp z> ‫ ا‬A‫ ه‬52 ‫م ا‬6>?' .8) ª ‫ و‬D2‫ ˆو‬

:4  ‫ آ‬9;  ‫ أ‬% ‫  و‬y? ‫ل ا‬T ‫ ا‬45 vp System.out.print(x); .x 8) ª ‫ و‬y D2‫ ˆو‬toString ‫د‬T ‫م ا‬6>?' Constant Class(9X.‫[س ا‬-.‫)ا‬: . overriding U 9 t?. 1 4% ' ‫س‬S ‫ا ا‬V 495 ‫س‬S‫ آ‬9 t?. 1 %.‫ أ‬4% ' ‫و ها‬ .final )‫ آ‬U); . D ‫س‬S ‫  ا‬2 ‫و‬ :‫ل‬T final class Student{…} . D U.E Student ‫س‬S ‫  ا‬MasterStudent ‫س‬S ‫ ا‬T 495 ‫س‬S‫ آ‬9 t?. 1 vp Hirachies(‫م‬±.‫)ا‬: .D2‫س أو‬S) 95 ‫ ت‬S‫ آ‬9 ‫;رة‬9 4‫ ت ه‬S ‫ آ ا‬52 ‫ ا‬45 Object Student PacStudent

MasterStudent

Abstract Classes (‫;دة‬.‫ت ا‬9O[-.‫)ا‬: 4 ‫د ا‬T ‫ام ا‬6> ‫ ا‬t?. 1‫ و‬D2‫ آ|و‬U‫ا‬6> ‫ ا‬t?. 1 %.‫ أ‬4% ' ‫ ها‬abstract ‫س‬S‫ ف آ‬. 6%9 ‫ك‬%‫  و ه‬2 ‫ر ا   ; ا‬2Æ 0 \. 9 6'.  ST 9+ ‫ ت ا‬S ‫ل ا‬SC  1‫ ا‬U)C‫ا‬6' 95 D2‫ و او‬9 6>?) abstract D2‫  او‬. [  ‫ب‬St ‫ ة و ا‬E‫ ا‬6>? ‫  ا‬9. .‫ب‬St ‫ ة و ا‬E‫   ا‬ :‫ل‬T abstract class User{ private String name; private String bookName; private Date borrowDate; public User(String _name){ name = _name; } public String getName(){ return name; } public void borrowBook(String bName){ bookName = bName; borrowDate = new Date(); } public void returnBook(){ bookName = null;

} public String getBook(){ return bookName; } public Date getBorrowDate(){ return borrowDate; } public abstract boolean isLate();

//HI.‫ت ا‬9O[-.‫ ا‬+: o9‫; آ‬/ o‫ ا‬+nb/ ‫د ا اآ و هŠا‬X.‫آ هŠا ا‬

} :49+ ‫س ا‬S ‫أ  ا‬6;. class Student extends User{ private int Id; public Student(String aName,int Id){ super(aName); this.Id = Id; } public boolean isLate(){ if (new Date().compareTo(borrowBook)>1) return true; return false; } public String getName(){ return super.getName(); } public int getId(){ return Id; } } class Professor extends User{ public Professor(String name){ super(name); } public boolean isLate(){ if (new Date().compareTo(borrowBook)>1) return true; return false; } public String getName(){ return "Dr."+super.getName(); } } class LibraryTest{

public static void main(String[] args){ User[] users = new User[3]; users[0] = new Student("abdallah ",20111017); users[0].borrowBook("Java 2 V2"); users[1] = new Professor("_‫;)"وا‬ users[1].borrowBook("JSP and Servlet"); users[2] = new Student("¨ ",9912312); for(int i = 0;i<users.length;i++){ System.out.print("\n "+users[i].getName()); If ( !(users[i].getBorrowBook().equals(null))){ System.out.print("\n"+users[i].getBorrowBook()+"has borrowd If(users[i].isLate()) System.out.print("\n Hi Is Late!!!"); } } } } :´9 .‫ل ا‬9X.‫ ا‬+: §9 .‫ ا‬+: Hl£‫] وا‬.‫ر ا‬m‫© ا‬b Date: ‫ز‬V2 ‫ ا‬9 ‫ و‬É'‫س '<أ ر‬S‫ آ‬9 ‫;رة‬9 ‫ه‬ :‫ل‬T Date a = new Date(); //‫ز‬V2 ‫ ا‬9 ‫ و‬É'‫ع '<أ ر‬% ‫  ها ا‬6'63 D2‫ء او‬% 6%9 compareTo : ;‫ آ‬9 ;  vp int ‫ع‬.   3' ‫ع و‬% ‫ ا‬ª+.  2‫  او‬.‫د '  <ر‬T 9 ‫;رة‬9 ‫ه‬ .'‫ ?و‬2‫و‬E‫ اذا آن ا‬0 V 3' 4 ‫ و ن ا < ا‬C³‫ ا‬9 D2‫و‬E‫ ا‬8z ‫او‬ :‫ل‬T int i = abdallah.compareTo(mhamad);

‫ول‬m‫ ا‬-;‫و‬m‫ا‬ o. H‫ر‬9`.‫اد ا‬.‫ا‬

‫¾ ع‬I  s9b.‫ا‬ H‫ر‬9`.‫ ا‬sb. ‫ول‬m‫ ا‬-;‫و‬m‫ا‬ o

equals: .‫ اذا آ‬vp boolean ‫ع‬.   3' ‫ع و‬% ‫ ا‬ª+.  2‫  او‬.‫د '  <ر‬T 9 ‫;رة‬9 ‫ه‬ . false 3' 1‫ و ا‬true 3' '‫?و‬ :‫ل‬T boolean b = abdallah.equals(mhamad);

:‫ة‬6+ ‫وا ا‬E‫ ا‬Å  System.exit(1): \.; ‫وج  ا‬C  ' :String‫ أوا ال‬ String toLowerCase() :‫ة‬8z ‫ف‬p‫ف ا ) ا @ ا‬p‫)@ ' ا‬9  ' :‫ل‬T String s = "GhOsT"; String h = s.toLowerCase(); String toUpperCase() : ‫ف آ;ة‬p‫ف ا @ أ‬pE‫)@ ' ا‬9  '

h = "ghost" : ‫’وج‬.‫ا‬

int compareToIgnoreCase(String s) : ‫ اذا‬0 3'(8z ‫ع ا ف)آ; أو‬. 9 Y% ‫ ا‬Å8 ‫ى‬C‫'<رن ا )  ا ) أ‬ '‫ ا ) ?و‬.‫آ‬ :‫ل‬T String s = "GHOST"; String h = "ghost" Int l = s. compareToIgnoreCase(h); l = 0 : ‫’وج‬.‫ا‬ String substring(int beginIndex,int endIbdex): .) ‫  ا‬t< ‫' ا‬V. ‫د‬6 ‫ و‬endIbdex ‫ ا ) و‬t '‫ا‬6  beginIndex  6'6 <. ‫(ئ  ا ?)?) و‬3 C‫)@ أ‬9  ' :‫ل‬T String s = "muhamad"; String sub = s. substring(2,6); sub = "hamad" : ‫’وج‬.‫ا‬

y5 ‫ ا‬4 ‫ و‬Ë‫وا‬ ' ‫[ ا‬V3 ¢ C ‫ ها‬4)9  3‫ ا‬4‫' ر‬ 4.T ‫(ء ا‬2 ‫ ا‬Ë‫ء ا‬X.‫'; إ‬