Source code dari Kelas Memulai Pemrograman Dengan Java di Dicoding Indonesia. Penasaran? Langsung aja ke https://www.dicoding.com/academies/60.
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Android
Bangun datar
package com.dicoding.javafundamental.bangundatar;
public interface BangunDatar {
public double luas(int s1, int s2);
public double keliling(int s1, int s2);
}
Main
Terakhir buat kelas Main untuk menjalankan program. Pada kelas ini kita instansiasi kelas setiap bangun datar.
package com.dicoding.javafundamental.bangundatar;
public class Main {
public static void main(String[] args) {
/Kamus/
PersegiPanjang opersegi;
SegitigaSiku osegitiga;
Lingkaran olingkaran;
int s1, s2, r;
opersegi = new PersegiPanjang();
osegitiga = new SegitigaSiku();
olingkaran = new Lingkaran();
}
}
Kita buat metode mainMenu. Metode ini digunakan untuk menampilkan pilihan menu.
package com.dicoding.javafundamental.bangundatar;
import java.util.Scanner;
public class Main {
private static char pilihan;
private static Scanner scanner = new Scanner(System.in);
public static void main(String[] args) {
/*Kamus*/
PersegiPanjang opersegi;
SegitigaSiku osegitiga;
Lingkaran olingkaran;
int s1, s2, r;
opersegi = new PersegiPanjang();
osegitiga = new SegitigaSiku();
olingkaran = new Lingkaran();
}
private static void mainMenu(){
//pilihan menu
System.out.println("====================");
System.out.println("Hitung Luas dan Keliling :");
System.out.println("1. Persegi Panjang");
System.out.println("2. Segitiga Siku");
System.out.println("3. Lingkaran");
System.out.print("Masukan Menu : ");
pilihan = scanner.next().charAt(0);
}
}
Lengkapi kode di dalam main menjadi seperti ini:
package com.dicoding.javafundamental.bangundatar;
import java.util.Scanner;
public class Main {
private static char pilihan;
private static Scanner scanner = new Scanner(System.in);
public static void main(String[] args) {
/*Kamus*/
PersegiPanjang opersegi;
SegitigaSiku osegitiga;
Lingkaran olingkaran;
int s1, s2, r;
opersegi = new PersegiPanjang();
osegitiga = new SegitigaSiku();
olingkaran = new Lingkaran();
/*Program*/
//panggil metode
mainMenu();
//kondisional untuk pilihan menu yang dimasukan
switch(pilihan){
case '1':{
System.out.print("Masukan panjang persegi: ");
s1 = scanner.nextInt();
System.out.print("Masukan lebar persegi: ");
s2 = scanner.nextInt();
System.out.println("Luas persegi panjang: " + opersegi.luas(s1,s2));
System.out.println("Keliling persegi panjang: " + opersegi.keliling(s1,s2));
break;
}
case '2':{
System.out.print("Masukan alas segitiga siku: ");
s1 = scanner.nextInt();
System.out.print("Masukan tinggi segitiga siku: ");
s2 = scanner.nextInt();
System.out.println("Luas segitiga: " + osegitiga.luas(s1,s2));
System.out.println("Keliling segitiga: " + osegitiga.keliling(s1,s2));
break;
}
case '3':{
System.out.print("Masukan jari-jari lingkaran: ");
r = scanner.nextInt();
System.out.println("Luas lingkaran: " + olingkaran.luas(r));
System.out.println("Keliling lingkaran: " + olingkaran.keliling(r));
break;
}
default :{
System.out.println("tidak ada pilihan");
break;
}
}
}
private static void mainMenu(){
//pilihan menu
System.out.println("====================");
System.out.println("Hitung Luas dan Keliling :");
System.out.println("1. Persegi Panjang");
System.out.println("2. Segitiga Siku");
System.out.println("3. Lingkaran");
System.out.print("Masukan Menu : ");
pilihan = scanner.next().charAt(0);
}
}
Main menu
package com.dicoding.javafundamental.bangundatar;
import java.util.Scanner;
public class Main {
private static char pilihan;
private static Scanner scanner = new Scanner(System.in);
public static void main(String[] args) {
/*Kamus*/
PersegiPanjang opersegi;
SegitigaSiku osegitiga;
Lingkaran olingkaran;
int s1, s2, r;
opersegi = new PersegiPanjang();
osegitiga = new SegitigaSiku();
olingkaran = new Lingkaran();
}
private static void mainMenu(){
//pilihan menu
System.out.println("====================");
System.out.println("Hitung Luas dan Keliling :");
System.out.println("1. Persegi Panjang");
System.out.println("2. Segitiga Siku");
System.out.println("3. Lingkaran");
System.out.print("Masukan Menu : ");
pilihan = scanner.next().charAt(0);
}
}
Segitiga siku
package com.dicoding.javafundamental.bangundatar;
public class SegitigaSiku implements BangunDatar {
SegitigaSiku() {
}
@OverRide
public double luas(int s1, int s2) {
return (0.5 * s1 * s2);
}
@OverRide
public double keliling(int s1, int s2) {
return (s1 + s2 + Math.sqrt((s1 * s1) + (s2 * s2)));
}
}
Persegi panjang
package com.dicoding.javafundamental.bangundatar;
public class PersegiPanjang implements BangunDatar {
PersegiPanjang() {
}
@Override
public double luas(int s1, int s2) {
return (s1 * s2);
}
@Override
public double keliling(int s1, int s2) {
return (2 * (s1 + s2));
}
}
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