Bro para Suhu Semuanya Ane Minta Pengertian darisetiap codding program di bawah donk...
ane masih kurang ngerti, ini, makasih bro
Ini contoh program Konversi Suhu...

import javax.swing.JOptionPane;

public class Suhu {

public static void main(String dian [] ) {

double hasil = 0;

String pilihan = JOptionPane.showInputDialog("Masukan Pilihan No. Anda : \n1. Reamur ke Fahrenheit \n2. Fahrenheit ke Reamur \n3. Celcius ke Reamur \n4. Reamur ke Celcius \n5. Celcius ke Fahrenheit \n6. Fahrenheit ke Celcius ");

int pilih = Integer.parseInt(pilihan);



switch (pilih) {

case 1:

{String RkeF = JOptionPane.showInputDialog("Masukan Reamur = ");

double rf = Integer.parseInt(RkeF);

hasil = (rf * 2.25) + 32;}

JOptionPane.showMessageDialog(null, "Hasil = " +hasil+ " Fahreinheit","info", JOptionPane.INFORMATION_MESSAGE);

break;

case 2:

{String FkeR = JOptionPane.showInputDialog("Masukan Fahrenheit = ");

double fr = Integer.parseInt(FkeR);

hasil = (fr -32) / 2.25;}

JOptionPane.showMessageDialog(null, "Hasil = " +hasil+ " Reamur","info", JOptionPane.INFORMATION_MESSAGE);

break;

case 3:

{String CkeR = JOptionPane.showInputDialog("Masukan Celcius = ");

double cr = Integer.parseInt(CkeR);

hasil = cr * 0.8;}

JOptionPane.showMessageDialog(null, "Hasil = " +hasil+ " Reamur","info", JOptionPane.INFORMATION_MESSAGE);

break;

case 4:

{String RkeC = JOptionPane.showInputDialog("Masukan Reamur = ");

double rc = Integer.parseInt(RkeC);

hasil = rc / 0.8;}

JOptionPane.showMessageDialog(null, "Hasil = " +hasil+ " Celcius","info", JOptionPane.INFORMATION_MESSAGE);

break;

case 5:

{String CkeF = JOptionPane.showInputDialog("Masukan Celcius = ");

double cf = Integer.parseInt(CkeF);

hasil = (cf * 1.8) + 32;}

JOptionPane.showMessageDialog(null, "Hasil = " +hasil+ " Fahrenheit","info", JOptionPane.INFORMATION_MESSAGE);

break;

case 6:

{String FkeC = JOptionPane.showInputDialog("Masukan Fahrenheit = ");

double fc = Integer.parseInt(FkeC);

hasil = (fc - 32) / 1.8;}

JOptionPane.showMessageDialog(null, "Hasil = " +hasil+ " Celsius","info", JOptionPane.INFORMATION_MESSAGE);

break;

}}}

Hasilnya gini kalo di jalankan