Program konversi sederhana java.

PROGRAM PENGUKURAN SUHU, MASSA JENIS, LUAS LINGKARAN, dan PENGUKURAN KALOR AIR.

Berikut ini adalah program java sederhana yang berfungsi untuk konversi suhu dan sejenisnya. Selamat mencoba. :)

import javax.swing.JOptionPane;
public class Trial{
public static void main(String[] args){
JOptionPane.showMessageDialog(null," SELAMAT DATANG DI PERCOBAAN PERTAMA SAYA ","Show Message",JOptionPane.INFORMATION_MESSAGE);
int start = 1;
while(start < 5) {
String Pilih;
int PILIH;
Pilih = JOptionPane.showInputDialog("----OUR MENU----\n\n1. PENGUKURAN SUHU \n2. PENGUKURAN MASSA JENIS\n3. PENGUKURAN LUAS LINGKARAN\n4. PENGUKURAN KALOR AIR\n5. EXIT\n\nYour Choice[1-4] : ");
PILIH = Integer.parseInt(Pilih);
switch(PILIH) {
    case 5 : JOptionPane.showMessageDialog(null,"\n\n        YOU'LL EXIT RIGHT NOW\nTHANKS FOR USING MY PROGRAM","Show Message",JOptionPane.INFORMATION_MESSAGE);
start++;break;
    case 1 :JOptionPane.showMessageDialog(null,"\n\nYOU'VE CHOICE PENGUKURAN SUHU","Show Message",JOptionPane.INFORMATION_MESSAGE);
        double satu = 0;
        satoe(satu);
        case 2 : JOptionPane.showMessageDialog(null,"\n\nYOU'VE CHOICE PENGUKURAN MASSA JENIS","Show Message",JOptionPane.INFORMATION_MESSAGE);
            double dua = 0;
            duo(dua);
            case 3 : JOptionPane.showMessageDialog(null,"\n\nYOU'VE CHOICE PENGUKURAN LUAS LINGKARAN","Show Message",JOptionPane.INFORMATION_MESSAGE);
                double tiga = 0;
                tigo(tiga);
                case 4 : JOptionPane.showMessageDialog(null,"\n\nYOU'VE CHOICE PENGUKURAN KALOR AIR","Show Message",JOptionPane.INFORMATION_MESSAGE);
             double empat = 0;
                    ephat(empat);
                    default : JOptionPane.showMessageDialog(null,"\n\nWRONG OPTION","DANGER!!!!",JOptionPane.INFORMATION_MESSAGE);
}}}
public static double satoe(double telo){
JOptionPane.showMessageDialog(null,"Welcome to Degrees Conversion","Show Message",JOptionPane.INFORMATION_MESSAGE);
Double x = Double.parseDouble(JOptionPane.showInputDialog(null,"Masukan Suhu Awal Dalam Celcius","Tampilkan",JOptionPane.QUESTION_MESSAGE));
Double a = x + 273;
Double b = x * 0.8;
Double c = (9 / 4 * x) + 32;
JOptionPane.showMessageDialog(null,"The result is =" + a + " K ","Show Result",JOptionPane.INFORMATION_MESSAGE);
JOptionPane.showMessageDialog(null,"The result is =" + b + " R ","Show Result",JOptionPane.INFORMATION_MESSAGE);
JOptionPane.showMessageDialog(null,"The result is =" + c + " F ","Show Result",JOptionPane.INFORMATION_MESSAGE);
JOptionPane.showMessageDialog(null," THANKS FOR USING MY PROGRAM ","Ucapan",JOptionPane.INFORMATION_MESSAGE);return telo;}
public static double duo(double ganda){
Double q = Double.parseDouble(JOptionPane.showInputDialog(null,"Masukkan massa","Tampilkan",JOptionPane.QUESTION_MESSAGE));
Double w = Double.parseDouble(JOptionPane.showInputDialog(null,"Masukkan volume","Tampilkan",JOptionPane.QUESTION_MESSAGE));
Double d = q / w;
JOptionPane.showMessageDialog(null,"Massa jenisnya adalah =" + d + " kg/m3 ","Show Result",JOptionPane.INFORMATION_MESSAGE);
JOptionPane.showMessageDialog(null," THANKS FOR USING MY PROGRAM ","Ucapan",JOptionPane.INFORMATION_MESSAGE);return ganda;}
public static double tigo(double telu){
Double i = Double.parseDouble(JOptionPane.showInputDialog(null,"Masukan jari-jari dalam cm","Tampilkan",JOptionPane.QUESTION_MESSAGE));
Double o = 2 * i;
Double n = 2 * 3.14 * i;
Double z = i * i * 3.14;
JOptionPane.showMessageDialog(null,"Panjang Diameternya =" + o + " cm ","Show Result",JOptionPane.INFORMATION_MESSAGE);
JOptionPane.showMessageDialog(null,"Keliling Lingkarannya =" + n + " cm ","Show Result",JOptionPane.INFORMATION_MESSAGE);
JOptionPane.showMessageDialog(null,"Luas Lingkarannya =" + z + " cm2 ","Show Result",JOptionPane.INFORMATION_MESSAGE);
JOptionPane.showMessageDialog(null," THANKS FOR USING MY PROGRAM ","Ucapan",JOptionPane.INFORMATION_MESSAGE);return telu;}
public static double ephat(double koe){
Double r = Double.parseDouble(JOptionPane.showInputDialog(null,"Masukkan massa","Tampilkan",JOptionPane.QUESTION_MESSAGE));
Double t = Double.parseDouble(JOptionPane.showInputDialog(null,"Masukkan suhu awal","Tampilkan",JOptionPane.QUESTION_MESSAGE));
Double u = Double.parseDouble(JOptionPane.showInputDialog(null,"Masukkan suhu akhir","Tampilkan",JOptionPane.QUESTION_MESSAGE));
Double e = r * (u - t);
JOptionPane.showMessageDialog(null,"Jumlah Kalornya adalah =" + e + " J ","Show Result",JOptionPane.INFORMATION_MESSAGE);
JOptionPane.showMessageDialog(null," THANKS FOR USING MY PROGRAM ","Ucapan",JOptionPane.INFORMATION_MESSAGE);return koe;}
}