contoh program yang menggunakan interface

1.interface

//nama:               virgilius

//kelas:                MI-02

//NIM:                  10508090

//

//

// TUGAS JAVA TENTANG INTERFACE

importjavax.swing.*;

interfacekonstharga

{

                // ciloktusuk

int cg = 500;                                                                                                       

intcr = 800;

intcbkr = 1000;

    // cilokporsi

intcgporsi = 5000;

intcrporsi = 8000;

intcbkrporsi = 10000;

    // string

    String satuan = " tusuk ";

    String porsi = " rim ";

}

// sintak public class nya

public class virgiliusinterface implements konstharga

{  

public static void main(String[] args)

  {  

System.out.println(" PROGRAM CILOK INTERFACE\n");

        String hasil;

                do{

                hasil="";

               

                try{

intbanyaktusuk=Integer.valueOf(JOptionPane.showInputDialog("MasukanBanyaknyatusukcilok"));

System.out.println("Harga "+banyaktusuk+" "+satuan+" cilokgoreng : Rp."+(cg*banyaktusuk));

System.out.println("Harga "+banyaktusuk+" "+satuan+" cilok rebus : Rp."+(cr*banyaktusuk));

System.out.println("Harga "+banyaktusuk+" "+satuan+" cilokbakar : Rp."+(cbkr*banyaktusuk));

}catch(Exception e){

                hasil=e.toString();

                System.out.println("Kesalahan : Input harusnumerik \n"+e);

                    }

                }while(!hasil.equals(""));

System.out.println();

do{

                hasil="";

               

                try{

intbanyakporsi=Integer.valueOf(JOptionPane.showInputDialog("MasukanBanyaknyaporsicilok"));

System.out.println("Harga "+banyakporsi+" "+porsi+" cilokgoreng : Rp."+(cgporsi*banyakporsi));

System.out.println("Harga "+banyakporsi+" "+porsi+" cilok rebus : Rp."+(crporsi*banyakporsi));

System.out.println("Harga "+banyakporsi+" "+porsi+" cilokbakar : Rp."+(cbkrporsi*banyakporsi));

}catch(Exception e){

                hasil=e.toString();

                System.out.println("Kesalahan : Input harusnumerik \n"+e);

                    }

                }while(!hasil.equals(""))              

    }

}

Output: