Java Programming - Chapter 12 (in Thai)

7/25/2019 Java Programming - Chapter 12 (in Thai)

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Computer Programming using JavaClasses and Objects - 12

CHAPTER

2

(Classes and Objects)

1. (Introduction to Classes and Objects)

1.

2.

Package

Constructor

Methods

Attributes (Attributes) (Constructors) (Methods)

(Package) (Classes)

Attributes

...

Method-1

Method-N

(Instance of Class) (Objects)

Attributes

...

Method-1

Method-N

Attributes

...

Method-1

Method-N

new new new

()

(Package) ()

(Class)

(Attribute)

Constructor

Methods

Attributes

Constructor

Methods

Attributes

(Constructor)

Class A Class B Class C

Object bObject a Object c

(Object-Oriented Programming)

(Method)

(Variable)

(Statement) (i f, f or , )

(Object) ()


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Computer Programming using Java 12 - Classes and Objects

1 [] (10 )

1 Class Diagram

2 [] () () (15 )1) 1 ()2) mai n( ) 3)

4) ()

1234

567891011121314151617

181920

publ i c cl ass Num {pri vat e i nt x;pr i vat e doubl e y;publ i c Num( ) {

x = 0; y = 0. 0;}publ i c Num( i nt m, doubl e n) {

x = m; y = n;}publ i c i nt addNX( i nt n) {

r et ur n n + x;}publ i c doubl e addNY(doubl e n) {

r et ur n n + y;}publ i c voi d showXY() {

System. out . pr i nt l n( x) ;

System. out . pr i nt l n( y) ;}}

12345678910

publ i c cl ass RunNum {publ i c stati c voi d mai n( St r i ng[ ] ar gs) {

Num obj = new Num( 5, 7. 0) ;obj . showXY( ) ;i nt a = obj . addNX( 4) ;doubl e b = obj . addNY(13. 0) ;Syst em. out . pr i nt l n( a) ;Syst em. out . pr i nt l n( b) ;

}}

Num

Num( )Num( i nt m, doubl e n)

i nt xdoubl e y

i nt addNX( i nt n)doubl e addNY( doubl e n)voi d showXY( )

obj: Num

x = 5y = 7. 0

addNX( i nt n)addNY( doubl e n) showXY( )

RunNum

publ i c st at i c voi d mai n( ) {Num obj= new Num(5, 7.0);

obj. showXY() ;

i nt a = obj. addNX( 4) ;...

}

new


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5)

6)

7)

8)

9) 10) 11) 12) 13)

14) 15)

2. (Classes)

1. 3 1)

2) 2

[] class {

[()]

[()]

[()]}.

[] ;

1

2345678

public c l assNum {

i nt x;publ i c doubl e y;Num( ) {

x = 0; y = 0. 0;}. . .

}

(Modifier) publ i cf i nal

* . j ava1 publ i c ( ) publ i c( )

(Modifier)

+ publ i c

- pr i vate

# prot ect edst at i cf i nal


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3) (Constructor) ()

4) 8

[] ([]) {[]

}.

12345

publ i c cl ass Dat a {public static int n = 1;

private double data;

. . .}

stat i c-stat i c

[] ([]) {[]

}.

Return Type

123456789

10111213141516

publ i c cl assNumber {publ i c l ong x;pr i vat e i nt y;publ i cNumber() {

x = 0L;y = 0;

}publ i cNumber(long a, int b) {

x = a;

y = b;}publ i cNumber(double k) {

x = y = ( i nt ) k;}. . .

}

publ i c

Overload

(Default Constructor)

12345

678

publ i c cl ass Oper at i on {. . .publ i c i nt incrX( i nt x) {

x = x + 1;r et ur n x;

}. . .

}

publ i c, pri vat e, pr ot ect ed,

stat i c f i nal

8 ()


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3 [ ] Course (30 )

public class Course {

//3 () (3 )//idprivate(Course ID)//titlepublic (Course Title)//creditprotected(Credit)

// 3 (int0, String"" ) (3 )

// 3 3 (3 )

//setID()public id (3 )


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//setTitle()public -title (3 )

//setCredit()public -credit (3 )

//getLevel()public 3 2110191 1 2 Undergraduate ( 1-4) Graduated (5 )(3 )

//getFaculty()public 2110191 21

(3 )


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//getDepartment()public 3-4 2110191 10 (3 )

//toString()public 2110191 Innovative Thinking (3) (3 )

} //End of class

2.

1)

(Body) (Local Variable)

2) (Head)

3)

(Global Variable)

123456789101112

131415

publ i c cl ass Test {pr i vat e st at i c i nt x = 10;pr i vat e st at i c i nt y = 1;publ i c stat i c i nt get X( ) { r et ur n x; }publ i c st at i c i nt get X( i nt x) { r et ur n x; }publ i c st at i c i nt i ncX( i nt y) { r et ur n x + y; }publ i c stati c voi d mai n( St r i ng[ ] ar gs) {

i nt x = 5;System. out . pr i nt l n( x) ; 5System. out . pr i nt l n( y) ; 1Syst em. out . pr i nt l n( get X( ) ) ;

10Syst em. out . pr i nt l n( get X( 2) ) ;

2

System. out . pr i nt l n( i ncX( x) ) ; 15}

}

xy get X( ) xget X( i nt x)

xxyy

xx

yy

xmai n( ) xget X( i nt x)


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4)

4 [] (10 )

3. (Objects)

1.

1)

()

12345678910111213141516171819202122232425262728

29303132

publ i c cl ass Test {pr i vat e st at i c i nt x = 5;pr i vat e st at i c i nt y = 2;publ i c stati c voi d mai n( St r i ng[ ] ar gs) {

i nt x = 9;System. out . pr i nt l n( x) ;Syst em. out . pr i nt l n( get X( ) ) ;Syst em. out . pr i nt l n( showX( ) ) ;y = 1;System. out . pr i nt l n( y) ;System. out . pr i nt l n( get Y( ) ) ;Syst em. out . pr i nt l n( showY( ) ) ;i nt y = 11;System. out . pr i nt l n( y) ;System. out . pr i nt l n( get Y( ) ) ;Syst em. out . pr i nt l n( showY( ) ) ;

}publ i c st at i c i nt get X( ) {

r et ur n x;}publ i c st at i c i nt get Y( ) {

r et ur n y;}publ i c st at i c i nt showX( ) {

i nt x = 7;r et ur n x;

}publ i c stati c i nt showY( ) {

i nt y = 12;r et ur n y;

}}

1) y10 yy

2) y14 yy

publ i c cl ass Test Cl ass {

publ i c i nt add( ) {

return ;} / / End of method

} / / End of cl ass

Attribute1

Parameter2

Variable3

?

?


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2)

2. 1)

St udent st d; / Car car ; / Account obj ;

2) (new)

st d = new St udent ( 52300121) ; / car = new Car ( ) ; / obj = new Account ( 101) ;

3)

2

1

2

(

)

Student st d = new Student ( 52300121) ; / Account obj = new Account ( 101) ;

4)

;

= new ( ) ;

= new ( ) ;

a. at t r 1 = 0

a. method1( )a. met hod2( )

Attributes

...

Method-1

Method-N

New Object

Constructor

Methods

Attributes

Class A

Object a

= new ;

( ) (Constructor)

123456789101112

publ i c cl ass Digit {publ i c i nt x;Digit() {

x = 0;}Digit(int n) {

x = n;}publ i c i nt get X( ) {

r et ur n x;}

}

12345678910

publ i c cl ass TestDigit {publ i c st at i c voi dmain( St r i ng[ ] ar gs){

Di gi t d = new Digit();Di gi t e = new Digit(1);Di gi t f = new Digit(2);i nt di gi t 1 = d. get X( ) ;i nt di gi t 2 = e. get X( ) ;i nt di gi t 3 = f . get X( ) ;

}}

mai n+ +


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5 [] (8 )

6 [] TestNumber Number

Number(10 )

//TestNumberimport java.util.Scanner;

public static void main(String[] args) {Scanner kb = new Scanner(System.in);

//no1 Number(Number)

1234

56789101112

publ i c cl ass St udent {publ i c i nt i d;publ i c St r i ng name;Student ( ) { i d = 0; name = "" ; }

St udent ( i nt i , St r i ng n) { i d = i ; name = n; }publ i c St r i ng getName( ) { r etur n name; }publ i c i nt get I D( ) { r et ur n i d; }publ i c char cal Gr ad( i nt scor e) {

i f ( scor e > 60) { r et ur n ' S' ; }el se { r et ur n ' U' ; }

}}

123456789101112

publ i c cl ass Test St udent {publ i c stati c voi d mai n( St r i ng ar gs[ ] ) {

Student y = new St udent ( 101, "Taksi n" ) ;St udent z = new St udent ( 102, "Api si t " ) ;Student x = new Student ( ) ;Syst em. out . pr i nt l n( x. get I D( ) + ", " + x. get Name( ) ) ;Syst em. out . pr i nt l n( y. get I D( ) + ", " + y. get Name( ) ) ;Syst em. out . pr i nt l n( ( z. get I D( ) + 1) + ", " + z. get Name( ) ) ;System. out . pr i nt l n( y. get Name( ) + ": " + y. cal Gr ad( 49) ) ;System. out . pr i nt l n( z. get Name( ) + ": " + z. cal Gr ad( 79) ) ;

}}

1234567891011

publ i c cl ass Number {pr i vat e doubl e x;pr i vat e doubl e y;Number ( ) { x = y = 0; }Number ( doubl e a, doubl e b) { x = a; y = b; }publ i c doubl e add( ) { r et ur n x + y; }publ i c doubl e sub( ) { r et ur n x - y; }publ i c doubl e mul ( ) { r et ur n x * y; }publ i c doubl e di v( ) { r et ur n x / y; }publ i c doubl e mod( ) { r et ur n x % y; }

}


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// 2 no2 Number

// no2

} //End of main} //End of class

4.

1.

1) public,privateprotected (Where)

modifierme()(A)modifierme()

modifierme() modifierme()

2

3

4

Class BClass A

modifierme()

Class D

Package java.test1 Package java.test2

Class C Extends A

Methods in A callmodifierme()1

Methods in B call

modifier me()2

Methods in C callmodifier me()3

Methods in D callmodifier me()4

1


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( )

publ i c me( )

pri vate me( ) prot ect ed me( ) me( )

privatepublic

2) static

(How)

(stat i c) (stat i c)

7 [] (18 )1)

data

2) var10

3) check

4) stdName 351


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5) m8 x 5

6)

show show

7) search x num

8) mulMatrix

2

9)

union 2

2. 1) (

8-11 ) stat i cstat i c

2) (stat i c) (1)

(Class Variable)

Mat h. PI ; Col or . RED;

. ;

stat i c stat i c stat i c stat i c stat i c stat i c stat i c stat i c


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(2)(Class Method)

Mat h. pow( 2, 3) ; Ti me. st ar t ( ) ;

3) (stat i c) (1)

(Object Variable)(Instance Variable)

obj St d. i d; no. x; g. y;

(2)

(Object Method) (Instance Method)

st d. get ( 5230121) ; c. st op( ) ;

8 [] (20 )(A) Class Variable (B) Class Method (C) Object Variable (D) Object Method

1. Mat h. sqr t ( x) 11. st d. gr ad

2. p. col or Code( s) 12. Sqt . bor der s( a, b)

3. Ar r ay. equal s( a, b) 13. i n. r eadLi ne( )

4. v. x 14. Syst em. i n

5. System. get Pr oper t i es( ) 15. Math. r andom( )

6. I nt eger . MAX_VALUE 16. i n. hasNext ( )

7. kb. next I nt ( ) 17. i . i d_code

8. r ectangl e. set Si ze( w, h) 18. out . c l ose( )

9. Mat h. PI 19. St r i ng. f or mat ( "%4d", x)

10. a. appendAr r ays(x, y) 20. o. name

. ( ) ;

. ;

. ( ) ;

static

..

stat i c


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9 [] (15 )

10 [] Dice n 6 12 TestDiceDice(20 )

public class Dice {

//publicface //publicvalue

// 2

1234

56789101112

publ i c cl ass Val {publ i c stat i c i nt x;publ i c stat i c i nt y;publ i c st at i c St r i ng s;

publ i c Val ( ) { x = 0; y = 0; s = " " ; }publ i c Val ( i nt x, i nt y) { t hi s. x = x; t hi s. y = y; }publ i c st at i c i nt get X( ) { r et ur n x; }publ i c stat i c i nt get Y( ) { r et ur n y; }publ i c stat i c i nt get Y( i nt y) { r et ur n y; }publ i c st at i c St r i ng get S( ) { r et ur n s; }publ i c st at i c St r i ng get S( St r i ng s) { r et ur n s; }

}

1234

567891011121314151617

181920

publ i c cl ass Test {publ i c stati c voi d mai n( St r i ng[ ] ar gs) {

Syst em. out . pr i nt l n( Val . x + ", " + Val . y) ;Val . x = 6; Val . y = 10;

Syst em. out . pr i nt l n( Val . get X( ) + ", " + Val . get Y( ) ) ;Val . s = "Good By A" ;System. out . pr i nt l n( Val . get S( ) ) ;Syst em. out . pr i nt l n( Val . get S( "See You F") ) ;Val v = new Val ( ) ;Syst em. out . pr i nt l n( v. x + ", " + v. y) ;v. x = 5; v. y = 7;Syst em. out . pr i nt l n( v. get X( ) + ", " + v. get Y( ) ) ;Syst em. out . pr i nt l n( Val . get X( ) + ", " + Val . get Y( ) ) ;Val w = new Val ( 9, 7) ;Syst em. out . pr i nt l n( w. get X( ) + ", " + w. get Y( ) ) ;Syst em. out . pr i nt l n( v. get X( ) + ", " + v. get Y( ) ) ;v. s = "I l ove J ava";

Syst em. out . pr i nt l n( w. get S( ) ) ;}}

-stat i cGlobal


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//

//

//roll 1 value

//setValue value

//getFace


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//getValue

//show

} //End of class

public class TestDice {

/* 3 d1, d2d3d1 d2 13 d3 30 9

3 3 20 3 */

} //End of class


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11 [] RealNumber -TestRealNumberRealNumber(15 )

public class RealNumber {

//

public

num

//numDefault

// num

//plus

num

//diff

num

} //End of class


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public class TestRealNumber {

/* 1 r 70 RealNumber15 50 */

} //End of class

12 [] Account (10 )1) balance Object Variable 2) 2

0

3)

deposit() Object Method

4) withdraw() Object Method

5)

getbalance() Object Method


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TestAccount Account 1 2000 1500 800

() (10 )


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13 [] PiggyBank 1 2 5 10 (20 )

public class PiggyBank {

(1)publicone, two, fiveten

(2)

publicsize

(3)2 1) size100 02) sizesize

0

(4)clear() (0)


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(5)getTotal()

(6)full() truefalse

(7)addOne() 1

(8)addTwo() 2


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(9)

addFive()5

(10) addTen()10

}//End of class


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TestPiggyBank PiggyBank 500 34 13

public class TestPiggyBank {public static void main(String[] args) {

}//End of main}//End of class

Documents

Java Programming - Chapter 12 (in Thai)