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BelajarJava

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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belajarjava's Issues

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));
}

}

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);
}

}

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