contoh program java : JOptionPane

PROGRAM 1 :

import javax.swing.*;

public class Insifelsif2 {

public static void main (String[] args){

                                String quant = JOptionPane.showInputDialog("Quantity ?");

                                String harga = JOptionPane.showInputDialog("Harga barang ?");

                               

                                float iquant = Float.parseFloat(quant);

                                float iharga = Float.parseFloat(harga);

float jumlah = iquant * iharga;

float diskon=0;

String ket=null;

if ((100000<=jumlah)&&(jumlah<=300000)){

                diskon = jumlah * 10 /100;

                ket = "diskon 10 %";

}else{

                if ((300000<=jumlah)&&(jumlah<=500000)){

                diskon = jumlah * 20 /100;

                ket = "diskon 20 %";

}else{

                if ((500000<=jumlah)&&(jumlah<=700000)){

                diskon = jumlah * 30 /100;

                ket = "diskon 30 %";

}

else {

                if (100000<jumlah){

                diskon = jumlah * 40 /100;

                ket = "diskon 40 %";

}             

}                             

                               

                }

}

float bayar;

bayar = jumlah - diskon;

System.out.println("Quantity = "+quant);

System.out.println("Harga =  RP."+harga);

System.out.println("Jumlah = RP."+(int)jumlah);

System.out.println("diskon = RP."+(int)diskon);

System.out.println("bayar =  RP."+(int)bayar);

System.out.println("Keterangan = "+ket);

}}

OUTPUT :

PROGRAM 2 :

import javax.swing.*;

public class menu {

                public static void main (String [] args){

                                float luas=0;

                                String pil = JOptionPane.showInputDialog(

                                "Menu bangun \n"+

                                "----------------------------------\n"+

                                "1. Luas segitiga               \n"+

                                "2. persegi panjang \n"+

                                "3. Bujur sangkar\n"+

                                "4. exit");

                int upil = Integer.parseInt(pil);

                switch (upil){

                case 1 :

                                float alas = Float.parseFloat(JOptionPane.showInputDialog("Alas ?"));

                                float tinggi = Float.parseFloat(JOptionPane.showInputDialog("Tinggi ?"));

                               

                                luas=(alas*tinggi)/2;

                                break;

                case 2 :

                                float panjang = Float.parseFloat(JOptionPane.showInputDialog("panjang ?"));

                                float lebar = Float.parseFloat(JOptionPane.showInputDialog("lebar ?"));

                                luas = panjang * lebar;

                                break;

                case 3 :

                                float sisi = Float.parseFloat(JOptionPane.showInputDialog("panjang Sisi ?"));

                                luas=sisi*sisi;

                                break;

                default :

                                JOptionPane.showMessageDialog(null,"Terimakasih","konfirmasi",1);

                                System.exit(0);

                }             

                                System.out.print("Luasnya = "+luas);

                }

                               

}

OUTPUT :