Hasil :
PBO : Antrian Bank
Ini adalah contoh program antrian bank
1: import java.util.Date;
2: import java.text.DateFormat;
3: import java.text.SimpleDateFormat;
4: public class Antrian
5: {
6: private int antrian = 1;
7: private String getTanggal(){
8: DateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy H:mm:ss");
9: Date date = new Date();
10: return dateFormat.format(date);
11: }
12: public void printTicketantrian(){
13: System.out.println(getTanggal());
14: System.out.println("Nomor Antrian Anda:");
15: System.out.println(antrian++);
16: System.out.println("Terima kasih");
17: }
18: }
1: import java.util.Scanner;
2: public class IntMain
3: {
4: public static int main (String args[])
5: {
6: Scanner scan = new Scanner (System.in);
7: int menu,tel=4;
8: Antrian ticket = new Antrian ();
9: while(true)
10: {
11: System.out.println ("1. Ambil nomor antrian");
12: System.out.println("2. Exit\n");
13: System.out.print(" ");
14: menu = scan.nextInt();
15: switch(menu)
16: {
17: case 1:
18: System.out.println("\n");
19: ticket.printTicketantrian();
20: if(tel==4)
21: {tel=1;}
22: else
23: {tel=tel+1;}
24: System.out.printf("nomor teller %d\n",tel);
25: break;
26: case 2:
27: return 0;
28: }
29: }
30: }
31: }
outputnya
Menghitung Luas dan Keliling Bangun 2D
Berikut source code untuk menghitung beberapa bangun datar 2D.
- Segitiga
public class Triangle
{
private double a;
private double t;
private String color;
public Triangle()
{
a = 1.0;
t = 1.0;
color = "white";
}
public Triangle(double alas)
{
a = alas;
t = 1.0;
color = "white";
}
public Triangle(double alas,String warna)
{
a = alas;
color = warna;
}
public Triangle(double alas,double tinggi,String warna)
{
a = alas;
t = tinggi;
color = warna;
}
public double getA()
{
return a;
}
public double getT()
{
return t;
}
public String getColor()
{
return color;
}
public double getArea()
{
return a*t/2;
}
public String toString()
{
return String.format("A %s colored triangle have an area of %f cm",this.getColor(),this.getArea());
}
}
- Lingkaran
import static java.lang.Math.*;
public class Circle
{
private double r;
private String color;
public Circle ()
{
r = 1.0;
color = "red";
}
public Circle (double jari)
{
r = jari;
color = "red";
}
public Circle ( double jari, String warna )
{
r = jari;
color = warna;
}
public double getArea(){
System.out.printf("Area of %s Circle is.. %f\n",color,PI * r * r);
return PI * r * r;
}
public double getRound()
{
System.out.printf("Around of %s Circle is.. %s\n",color,PI * 2 * r);
return PI * 2 * r;
}
public double getRadius()
{
return r;
}
public String getColor()
{
return color;
}
public String toString()
{
return String.format("A Circle with %s color has an area of %f cm",this.getColor(),this.getArea());
}
}
-Segiempat
public class Square
{
private double s;
private String color;
public Square()
{
s = 1.0;
color = "white";
}
public Square(double sisi)
{
s = sisi;
color = "white";
}
public Square(double sisi,String warna)
{
s = sisi;
color = warna;
}
public double getArea(){
return s * s;
}
public double getRound()
{
return 4 * s;
}
public double getSide()
{
return s;
}
public String getColor()
{
return color;
}
public String toString()
{
return String.format("The %s colored Square has an Area of %f cm",this.getColor(),this.getArea());
}
}
- Persegi Panjang
public class Rectangle
{
private double p;
private double l;
private String color;
public Rectangle()
{
p = 1.0; l = 1.0;
color = "white";
}
public Rectangle(double panjang,double lebar)
{
p = panjang;
l = lebar;
color = "white";
}
public Rectangle(double panjang,double lebar,String warna)
{
p = panjang;
l = lebar;
color = warna;
}
public double getP()
{
return p;
}
public double getL(){ return l; }
public String getColor() {return color; }
public double getArea ()
{
return p * l;
}
public double getRound()
{
return 2*(p+l);
}
public String toString()
{
return String.format("A %s colored rectangle with Lenght of %f and Widht of %f have an area of %f cm"
,this.getColor(),this.getP(),this.getL(),this.getArea());
}
}
public class MainClass
{
public static void main()
{
Circle circle1 = new Circle(7.0,"Black");
Circle circle2 = new Circle(14.0);
Circle circle3 = new Circle();
System.out.println(circle1);
System.out.printf("A round of %f\n",circle1.getRound());
System.out.println(circle2);
System.out.printf("A round of %f\n",circle2.getRound());
System.out.println(circle3);
System.out.printf("A round of %f\n",circle3.getRound());
System.out.printf("\n\n");
System.out.printf("Now to test the Rectangle\n");
Rectangle persegi1 = new Rectangle(5,4);
Rectangle persegi2 = new Rectangle(5,3,"Merah");
Rectangle persegi3 = new Rectangle();
System.out.println(persegi1);
System.out.printf("A round of %f\n",persegi1.getRound());
System.out.println(persegi2);
System.out.printf("A round of %f\n",persegi2.getRound());
System.out.println(persegi3);
System.out.printf("A round of %f\n",persegi3.getRound());
System.out.printf("\n\n");
System.out.printf("Now to test the square\n");
Square kotak1 = new Square(10);
Square kotak2 = new Square(5,"hijau");
Square kotak3 = new Square();
System.out.println(kotak1);
System.out.printf("A round of %f\n",kotak1.getRound());
System.out.println(kotak2);
System.out.printf("A round of %f\n",kotak2.getRound());
System.out.println(kotak3);
System.out.printf("A round of %f\n",kotak3.getRound());
System.out.printf("\n\n");
System.out.printf("Now to test the triangle\n");
Triangle segitiga1 = new Triangle(2);
Triangle segitiga2 = new Triangle(6.0,3.0,"Kuning");
Triangle segitiga3 = new Triangle ( 10.0, "Kuning");
Triangle segitiga4 = new Triangle();
System.out.println(segitiga1);
System.out.println(segitiga2);
System.out.println(segitiga3);
System.out.println(segitiga4);
System.out.printf("\n\n");
}
} A Deeper Look - PBO
Ini adalah beberapa latihan kodingan java
- Latihan 8.7
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 | /** Latihan 8.7 @author (Tegar Satrio Utomo) @version (6/3/17) */ public class Date { private int month; private int day; private int year; private static final int[] daysPerMonth = {0,31,28,31,30,31,30,31,31,30,31,30,31}; public Date(int theMonth, int theDay, int theYear) { month=checkMonth(theMonth); year=theYear; day=checkDay(theDay); System.out.printf("Date object constructor for date %s\n",this); } private int checkMonth(int testMonth) { if(testMonth>0&&testMonth<=12) return testMonth; else throw new IllegalArgumentException("Month Must be 1-12"); } private int checkDay(int testDay) { if(testDay>0&&testDay<=daysPerMonth[month]) return testDay; if(month==2&&testDay==29&&(year%400==0||(year%4==0&&year%100!=0))) return testDay; throw new IllegalArgumentException("day out-of-range for the specific month and year"); } public String toString() { return String.format("%d/%d/%d",month,day,year); } } |
- Latihan 8.8
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | /** Latihan 8.8 @author (Tegar Satrio Utomo) @version (6/3/17) */ public class Employee { private String firstName; private String lastName; private Date birthDate; private Date hireDate; public Employee(String first, String last, Date dateOfBirth, Date dateOfHire) { firstName=first; lastName=last; birthDate=dateOfBirth; hireDate=dateOfHire; } public String toString() { return String.format("%s, %s Hired: %s Birthday: %s",lastName,firstName,hireDate,birthDate); } } |
- Latihan 8.9
1 2 3 4 5 6 7 8 9 10 11 12 | /**Latihan 8.9 @author (Tegar Satrio Utomo) @version (6/3/17) */ public class EmployeeTest { public static void main(String [] args) { Date Birth=new Date (7,24,1949); Date Hire= new Date(3,12,1968); Employee employee= new Employee ("Bob","Blue",Birth,Hire); System.out.println(employee); } } |
- Latihan 8.10
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 | /** Latihan 8.10 @author (tegar satrio utomo) @version (6/3/17) */ public enum Book { JHTP("Java How to Program","2012"), CHTP("C How to Program","2007"), IW3HTP("Internet & World Wide Web How to Program","2008"), CPPHTP("C++ How to Program","2012"), VBHTPC("Visual Basic How to Program","2011"), CSHARPHTP("Visual C# How to Program","2011"); private final String title; private final String copyrightYear; Book(String BookTitle, String year) { title=BookTitle; copyrightYear=year; } public String getTitle() { return title; } public String getCopyrightYear() { return copyrightYear; } } |
- Latihan 8.11
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | /** Latihan 8.11 @author (Tegar Satrio Utomo) @version (6/3/17) */ import java.util.EnumSet; public class EnumTest { public static void main(String[] args) { System.out.println("All Books\n"); for(Book book : Book.values() ) System.out.printf("%-10s%-45s%s\n",book,book.getTitle(),book.getCopyrightYear()); System.out.println("\nDisplay a range of enum constants:\n"); for(Book book : EnumSet.range(Book.JHTP,Book.CPPHTP)) System.out.printf("%-10s%-45s%s\n",book,book.getTitle(),book.getCopyrightYear()); } } |
- Latihan 8.12
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 | /** Latihan 8.12 @author (Tegar Satrio Utomo) @version (6/3/17) */ public class Employee { private String firstName; private String lastName; private static int count= 0; public Employee(String first, String last) { firstName = first; lastName = last; ++count; System.out.printf("Employee constructor: %s %s; count = %d\n",firstName,lastName,count); } public String getFirstName() { return firstName; } public String getLastName() { return lastName; } public static int getCount() { return count; } } |
- Latihan 8.13
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | /** latihan 8.13 @author (Tegar Satrio Utomo) @version (6/3/17) */ public class EmployeeTest { public static void main(String[] args) { System.out.printf("Employees before instatiation: %d\n",Employee.getCount()); Employee e1 = new Employee("Susan","Baker"); Employee e2 = new Employee("Bob","Blue"); System.out.println("\nEmployees after instantion: "); System.out.printf("via e1.getCount(): %d\n",e1.getCount()); System.out.printf("via e2.gerCount(): %d\n",e2.getCount()); System.out.printf("via employee.getCount(): %d\n",Employee.getCount()); System.out.printf("Employee 1: %s %s\nEmployee 2: %s %s\n" ,e1.getFirstName(),e1.getLastName(),e2.getFirstName(),e2.getLastName()); e1=null;e2=null; } } |
PBO - Ticket Machine
Berikut adalah code java untuk Ticket Machine yang saya pelajari di kelas PBO
public class TicketMachine
{
private int price;
private int balance;
private int total;
public TicketMachine(int ticketCost)
{
price = ticketCost;
balance = 0;
total = 0;
}
public int getPrice()
{
return price;
}
public int getBalance()
{
return balance;
}
public void insertMoney(int amount)
{
balance = balance + amount;
}
public void printTicket()
{
System.out.println("@@@@@@@@@@@@@@@@@@");
System.out.println("@ The BlueJ Line @");
System.out.println("@ Ticket @");
System.out.println("" + price + " cents.");
System.out.println();
total = total + balance;
balance = 0;
}
}
import java.util.Scanner;
public class IntMain
{
public static int main()
{
Scanner scan = new Scanner(System.in);
int cost,menu;
System.out.println("Masukkan harga tiket \n");
cost=scan.nextInt();
TicketMachine ticket=new TicketMachine(cost);
while (true){
System.out.println("1. Get Price");
System.out.println("2. Get Balance");
System.out.println("3. Insert Money");
System.out.println("4. Print Ticket");
System.out.println("5. EKZIT");
menu=scan.nextInt();
switch(menu)
{
case 1:
cost=ticket.getPrice();
System.out.println(cost);
break;
case 2:
System.out.println(ticket.getBalance());
break;
case 3:
int money=scan.nextInt();
ticket.insertMoney(money);
break;
case 4:
ticket.printTicket();
break;
case 5:
return 0;
}
}
}
}
PBO Program Chapter 8 Class and Objects
8.1 Time1.java
/**
public class Time1
{
private int hour;
private int minute;
private int second;
public void setTime(int h, int m, int s)
{
if ( ( h >= 0 && h< 24 ) && ( m >= 0 && m< 60 ) &&
( s >= 0 && s < 60 ) )
{
hour = h;
minute = m;
second = s;
}
else
throw new IllegalArgumentException(
"hour, minute and/or second was out of range" );
}
public String toUniversalString()
{
return String.format( "%02d:%02d:%02d", hour, minute, second );
}
public String toString()
{
return String.format( "%d:%02d:%02d %s", ( ( hour == 0 || hour == 12) ? 12
: hour % 12 ), minute , second, ( hour < 12 ? "AM" : "PM" ) );
}
}
8.2 Time1Test.java
public class Time1Test
{
public static void main( String[] args )
{
Time1 time = new Time1();
System.out.print( "The initial universal time is: ");
System.out.println( time.toUniversalString() );
System.out.print( "The initial standard time is: ");
System.out.println( time.toString() );
System.out.println();
time.setTime( 13, 27, 6 );
System.out.print( "Universal time after setTime is: ");
System.out.println( time.toUniversalString() );
System.out.print( "Standard time after setTime is: " );
System.out.println( time.toString() );
System.out.println();
try
{
time.setTime( 99, 99, 99 );
}
catch (IllegalArgumentException e )
{
System.out.printf( "Exception: %s\n\n", e.getMessage() );
}
System.out.println( "After attempting invalid settings:");
System.out.print( "Universal time: ");
System.out.println( time.toUniversalString() );
System.out.print( "Standar time: ");
System.out.println( time.toString() );
}
}
Output :
8.3 MemberAccessTest.java
public class MemberAccessTest
{
public static void main( String[] args )
{
Time1 time = new Time1();
time.hour = 7;
time.minute = 15;
time.second = 30;
}
}
8.4 ThisTest.java
public class ThisTest
{
public static void main( String[] args )
{
SimpleTime time = new SimpleTime( 15, 30, 19 );
System.out.println( time.buildString() );
}
}
class SimpleTime
{
private int hour;
private int minute;
private int second;
public SimpleTime( int hour, int minute, int second )
{
this.hour = hour;
this.minute = minute;
this.second = second;
}
public String buildString()
{
return String.format( "%24s: %s\n%24s: %s",
"this.toUniversalString()", this.toUniversalString(),
"toUniversalString()", toUniversalString() );
}
public String toUniversalString()
{
return String.format( "%02d:%02d:%02d",
this.hour, this.minute, this.second );
}
}
Output :
8.5 Time2.java
public class Time2
{
private int hour;
private int minute;
private int second;
public Time2()
{
this( 0, 0, 0 );
}
public Time2( int h )
{
this( h, 0, 0 );
}
public Time2 ( int h, int m )
{
this( h, m, 0 );
}
public Time2( int h, int m, int s )
{
setTime( h, m, s );
}
public Time2( Time2 time )
{
this( time.getHour(), time.getMinute(), time.getSecond() );
}
public void setTime( int h, int m, int s )
{
setHour( h );
setMinute( m );
setSecond( s );
}
public void setHour( int h )
{
if ( h >= 0 && h < 24 )
hour = h;
else
throw new IllegalArgumentException( "hour must be 0-23" );
}
public void setMinute( int m )
{
if ( m >= 0 && m < 60 )
minute = m;
else
throw new IllegalArgumentException( "minute must be 0-59" );
}
public void setSecond( int s )
{
if ( s >= 0 && s < 60 )
second = ( ( s >= 0 && s < 60 ) ? s : 0 );
else
throw new IllegalArgumentException( "second must be 0-59" );
}
public int getHour()
{
return hour;
}
public int getMinute()
{
return minute;
}
public int getSecond()
{
return second;
}
public String toUniversalString()
{
return String.format(
"%02d:%02d:%02d", getHour(), getMinute(), getSecond() );
}
public String toString()
{
return String.format( "%d:%02d:%02d %s",
( (getHour() == 0 || getHour() == 12 ) ? 12 : getHour() % 12 ),
getMinute(), getSecond(), ( getHour() < 12 ? "AM" : "PM" ) );
}
}
8.6 Time2Test.java
public class Time2Test
{
public static void main( String[] args )
{
Time2 t1 = new Time2();
Time2 t2 = new Time2( 2 );
Time2 t3 = new Time2( 21, 34 );
Time2 t4 = new Time2( 12, 25, 42 );
Time2 t5 = new Time2( t4 );
System.out.println( "Constructed with:" );
System.out.println( "t1: all arguments defaulted" );
System.out.printf( " %s\n", t1.toUniversalString() );
System.out.printf( " %s\n", t1.toString() );
System.out.println(
"t2: hour specified; minute and second defaulted" );
System.out.printf( " %s\n", t2.toUniversalString() );
System.out.printf( " %s\n", t2.toString() );
System.out.println(
"t3: hour and minute specified; second defaulted" );
System.out.printf( " %s\n", t3.toUniversalString() );
System.out.printf( " %s\n", t3.toString() );
System.out.println( "t4: hour, minute and second specified" );
System.out.printf( " %s\n", t4.toUniversalString() );
System.out.printf( " %s\n", t4.toString() );
System.out.println( "t5: Time2 object t4 specified" );
System.out.printf( " %s\n", t5.toUniversalString() );
System.out.printf( " %s\n", t5.toString() );
try
{
Time2 t6 = new Time2( 27, 74, 99 );
}
catch ( IllegalArgumentException e )
{
System.out.printf( "\nException while initializing t6: %s\n", e.getMessage() );
}
}
}
Output :
Konsep Objek (PBO)
Pemrograman berorientasi objek (Inggris: object-oriented programming disingkat OOP) merupakan paradigma pemrograman yang berorientasikan kepada objek. Semua data dan fungsi di dalam paradigma ini dibungkus dalam kelas-kelas atau objek-objek. Bandingkan dengan logika pemrograman terstruktur. Setiap objek dapat menerima pesan, memproses data, dan mengirim pesan ke objek lainnya.
Langganan:
Postingan (Atom)
