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Java Programming - Chapter 13 (in Thai)
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Transcript of Java Programming - Chapter 13 (in Thai)
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Computer Programming using JavaAdvanced Classes and Objects - 13
CHAPTER
3
(Advanced Classes and Objects)
1.
1) ( )
1 (Default Constructor)
2 (Detail Constructor)3 (Copy Constructor)
2)
t hi s
123456789
101112131415161718
publ i c cl ass Data {publ i c i nt x;publ i c Dat a( ) {
x = 0;}publ i c Dat a(int n) {
x = n;}publ i c Dat a(Data d) {
x = d.x;}publ i c bool ean i sEq1( int n) {
r et urn x == n;}publ i c bool ean i sEq2( Data d) {
r et urn x == d.x;}
}
d
xdxdd. xxDat a
n
d
x
i nt n
n
d
x
Dat ad(xd)
12
345678
publ i c cl ass Dat a {publ i c i nt x;
. . .publ i c Dat a( i nt x) {x = x; / / Er ror
}. . .
}
xx
12345
678
publ i c cl ass Dat a {publ i c i nt x;. . .publ i c Dat a( i nt x) {this.x = x;
}. . .}
x
x = -x this.x =
t hi s
1
2
3
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Computer Programming using Java 13 - Advanced Classes and Objects
1 [] TestNumNum Num (16 )
import java.util.Scanner;
public class TestNum {
public static void main(String[] args) {
} //End of main} //End of class
------------------------------------------------------------------------
public class Num {public int x;
public int y;Num() {
x = y = 0;}
Num(int x, int y) {this.x = x; this.y = y;
}Num(Num n) {
this.x = n.x; this.y = n.y;
}public boolean isEquals(int x, int y) {
}public boolean isEquals(Num n) {
}} //End of class
Num n1 = new Num();System.out.println(n1.x + "," + n1.y);
()
Num n2 = new Num(13, 2);System.out.println(n2.x + "," + n2.y);
Num n3 = new Num(n2);System.out.println(n3.x + "," + n3.y);
Num n4 = new Num(new Num(7, 11));System.out.println(n4.x + "," + n4.y);
Num n5 = new Num(n4.y, n3.x);System.out.println(n5.x + "," + n5.y);
n2 = new Num(new Num());System.out.println(n2.x + "," + n2.y);
1
2
3
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Computer Programming using JavaAdvanced Classes and Objects - 13
3) ( )
2 [] Coin (Value) (Side) (H) (T) DemoCoinCoin(20 )
public class Coin {
//sidepublic"H""T"//valuepublic 1 , 2 , 5 10
//list private final String list[] = { "H", "T" };
//(H) 0
//
//Coin
1234
56789101112
publ i c cl ass Dat a {publ i c i nt x;. . .publ i c int get X( ) {
return x;}publ i c Data get Data( ) {
Dat a d = new Dat a( x) ;return d;
}. . .
}
x
d
x
dd. x()
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Computer Programming using Java 13 - Advanced Classes and Objects
//flip()(list)
//reverse()
//equals()
} //End of class
/* DemoCoin Coin4 1 2 () 5 2 ( ) 1 5 20 */
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Computer Programming using JavaAdvanced Classes and Objects - 13
public class DemoCoin {public static void main(String[] args) {
} //End of main} //End of class
3 [] SetOfInteger
(30 )public class SetOfInteger {
//public iSet()
// 1 iSet
{ 7, 5, 3, 5, 3 } { 3, 5, 7 } ()public SetOfInteger(int[] x) {
} //End of constructor
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// 1 SetOfIntegeriSetpublic SetOfInteger(SetOfInteger s) {
} //End of constructor
//sort() public int[] sort(int x[]) {
for (int i = x.length - 1; i >= 1; i--)
for (int j = 0; j x[j + 1]) {
int temp = x[j];x[j] = x[j + 1];x[j + 1] = temp;
}}
}
return x;} //End of method
//removeDuplicatedMembers() public int[] removeDuplicatedMembers(int x[]) {
int t[] = new int[x.length];int index = 0;for(int i = 0; i < x.length; i++) {
if (i == 0) {t[index] = x[i];
index++;
} else {int j;
for (j = 0; j < index; j++) {if (t[j] == x[i]) break;
}if (j == index) {
t[index] = x[i];index++;
}
}}
int n[] = new int[index];
for (int i = 0; i < n.length; i++) n[i] = t[i];return n;
} //End of method
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//equals()iSet iSetx
public boolean equals(SetOfInteger x) {
} //End of method
//toString()iSet public String toString() {
} //End of method
//addElement()iSetiSet
public void addElement(int a) {
} //End of method
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//findElement()iSet-1
public int findElement(int a) {
} //End of method
//isSubset()iSets (Subset) -iSet
public boolean isSubset(SetOfInteger s) {
} //End of method
//union()iSet iSet (Union) SetOfInteger
public SetOfInteger union(SetOfInteger s) {
} //End of method
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//intersect() iSet iSet (Intersection) SetOfInteger
public SetOfInteger intersect(SetOfInteger s) {
} //End of method
} //End of class
2.
1) (1) 1
(2) 2
(Dat a)
[ ] = new [ ] ;
[ ] [ ] = new [ ] [ ] ;
1234567
publ i c cl ass Test Dat a {publ i c stati c voi d mai n( St r i ng [ ] ar gs) {Data d = new Data();Data e = new Data(13);
Syst em. out . pr i nt l n( d. x + ", " + e. x) ;}
}
d
x = 0
e
x = 13
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4 [] Student(30 )public class Student {
//3 private(4 ) id name score
//(2 )
//3 (2 )
d
1234
5678910
publ i c cl ass Test Dat a {publ i c stati c voi d mai n( St r i ng [ ] ar gs) {Data d[] = new Data[6];f or ( i nt i = 0; i < d. l engt h; i ++) {
d[i] = new Data(i);}d[2].x = 15;d[4].x = 30
}}
6
()
6 newf or
d[0]
x = 0
d[1]
x = 1
d[2]
x = 15
d[ 3]
x = 3
d[4]
x = 30
d[ 5]
x = 5
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//1 Student(2 )
//4 (10 ) getID() getName() getScore() setScore()
score
} //End of class
Freshmenmain()(15 )import java.util.Scanner;
public class Freshmen {public static void main(String[] args) {
Scanner kb = new Scanner(System.in);
//800 Student()
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// 5300121 5380021 4
//setScore()4 0 100
//4
//
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} //End of main
} //End of class
3.
1) ( )
5 [
]
(City)
(Land) (Owner) 3 OwnerLandCity(30 )
Owner Land City
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891011121314141617
publ i c cl ass Box {publ i c doubl e v;
public Data d;publ i c Box( ) {
v = 0. 0;d = new Data();
}
publ i c Box( doubl e a, Dat a b) {v = a;d = new Data(b);
}publ i c Box( Box b) {
v = b. v;d = new Data(b.d);
}. . .
}
Box
vd
x
vdoubl e ()
dDat a new
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1. Owner(10 )public class Owner {
//privateid( )//privatename
//public (int0 double0.0 )
//public 2
//public1 Owner
//publicgetID
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//publicgetName
//publicsetID 1 (id)
//publicsetName 1 (name)
//public show
} //End of class
2. Land(10 )public class Land {
//public n Owner (OwnerLand) //publicprice
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//public ( new)
//public 2 Owner
//public setOwner 1 Owner (n )
//public setPrice 1 (price)
//public show
} //End of class
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3. Citymainmain(10 )import java.util.Scanner;
public class City {
public static void main(String[] args) {
// Land 3000 50 x 60()
//( Default) 1 10
//ow1 "Tukie"1001
//ow2 "Annie"1002
//Tukie(4, 9)
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// Tukie 30
//Annie Tukie
//Tukie 50 (1) 50
} //End of main} //End of class
6 [] Scanner1 1
Enter
12345678
91011
i mpor t j ava. ut i l . Scanner ;publ i c cl ass Test {
publ i c stati c voi d mai n( St r i ng[ ] ar gs) {Scanner kb = new Scanner ( Syst em. i n) ;System. out . pr i nt ( "Ent er I nt : ") ;i nt a = kb. next I nt ( ) ;System. out . pr i nt ( "Ent er St r : ") ;St r i ng b = kb. next Li ne( ) ;
Syst em. out . pr i nt l n( a + ", " + b) ;}
}
Ent er I nt : 10Ent er St r : 10
()Ent er I nt : 10
Ent er St r : J ava10, J ava
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SScanner SScanner Scanner(10 )import java.util.Scanner;import java.io.InputStream;
public class SScanner {//kbScanner
// 1 in InputStreamkb
//nextInt() 1
//nextLine() 1 0
} //End of class
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TestSScanner SScanner (5 )
public class TestSScanner {
public static void main(String[] args) {
} //End of main} //End of class
7 [] ()
3 Fruit BasketFruitBasket !(50 )
1. Fruit(10 )public class Fruit {
//name //weigh
//wh private final double wh[] = { 0.1, 0.2, 0.3, 0.4, 0.5 };
//4
(wh)
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Fruit
//showFruit
} //End of class
2. Basket(20 )public class Basket {
//fruitFruit //count
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// 10
//
// Basket
//isFull
//isEmpty
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//takeIn 1 Basket Full
//takeOut1 Basket Empty
//getTotalWeigh
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//showBasket
} //End of class
3. FruitBasket (20 )import java.util.Scanner;
public class FruitBasket {
//getFruitBasket1 () ( )
//showFruitBasket - (Total Weigh) (Total Fruit) (List of Fruit)
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//mainpublic static void main(String[] args) {
//3 ( Basket) getFruitBasket1 (Apple)
0.12 25 2 (Orange) 0.1 303 (Melon) 0.45 15
// 6 ( Basket) 3 6 1-3 showFruitBasket
} //End of main
} //End of class
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8 [] 3021 2 StudentRoom
(Noob Levels) 4 1 (Noob) 2 (Father Noob) 3 (God Noob) 4 (Hof Noob)(30 )1. Student(10 )
public class Student {
//privateid//privatename
//privatenoob
//
// 3
// Student
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//publicgetID
//publicgetName
//publicgetNoob
//publicset Student
//publicshow 1 "[1-Noob]" 2 "[2-Father Noob]"3 "[3-God Noob]"4 "[4-Hof Noob]""[Un- known]"
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} //End of class
2.
Room302 116 40 40 38 (20 )
public class Room {
//publics 2 Student 302 1 16 40
public void setSeat Student (1) (1)113-16(2)
29-12(3)35-8(4)
4
1-4
// ()
1
16
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//public void showRoom
W, T (#)
//public void showStudent 2
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//public void showStudent
//main()(1)s 2 Student (
0 ""0(2)
5 Akeudom, Phakhin, Taparb, Ong-ard Wongyos 1, 1, 2, 3, 4
(3)
5 setSeat()(4)
5 showRoom()(5)
showStudent()