Contoh Do while

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package Praktikum;

import java.io.DataInputStream;
import java.io.*;



/**
 *
 * @author kalvin jr
 */
public class Latihan7_do_while {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here
        String nip,nama,gol;
        int i=0;
         int a,b,c,lama_ker,gapok,tunj,upah_lembur,jam_kerja;
         double pph,gajikes;
        DataInputStream input =new DataInputStream(System.in);
        do{
        try{
        System.out.print("Masukkan NIP :");
        nip =input.readLine();
         System.out.print("Masukkan Nama :");
        nama =input.readLine();
        System.out.print("Masukkan Golongan :");
        gol =input.readLine();
        System.out.print("Masukkan LAMA KERJA :");
        lama_ker =Integer.parseInt(input.readLine());

        switch(gol)
        {
            case "3A" :
            { gapok =1000000;
                        tunj=100000;
                        break;}
            case "3B" :
            {  gapok =2000000;
                        tunj=200000; break;}
            case "3C" :
            {gapok=2500000;
                        tunj=250000; break;}
            case "3D" :
            {gapok=3000000;
                        tunj=300000; break;}
            case "4A" :
            {  gapok=3500000;
                        tunj=350000;
                        break;}
            case "4B" :
            { gapok=4000000;
                        tunj=400000;break;}
            case "4C" :
            { gapok=4500000;
                        tunj=450000;break;}
            default :{ gapok=0;
                        tunj=0; break;}

        }
        jam_kerja=lama_ker-7;
        switch(lama_ker)
        {
            case 1: {
                upah_lembur=0; break;}
            case 2: {
                upah_lembur=0; break;}
            case 3: {
                upah_lembur=0; break;}
             case 4: {
                upah_lembur=0; break;}
             case 5: {
                upah_lembur=0; break;}
             case 6: {
                upah_lembur=0; break;}
             case 7: {
                upah_lembur=0; break;}
            default : {upah_lembur=jam_kerja*50000;break;
            }
        }
        pph=0.1 *gapok;

        gajikes=(gapok+tunj+upah_lembur)-(int)pph;
        System.out.println("\n");
        System.out.println("DAFTAR GAJI KARYAWAN");
        System.out.println("NIP :"+nip);
        System.out.println("NAMA :"+nama);
        System.out.println("GOLONGAN :"+gol);
        System.out.println("GAJI POKOK :"+gapok);
        System.out.println("TUNAJNGAN :"+tunj);
        System.out.println("UPAH LEMBUR :" +upah_lembur);
        System.out.println("PPH :"+pph);
        System.out.println("TOTAL GAJI :"+gajikes);
        }catch(IOException e){}
        System.out.println("/n/n");

     }while(i < 20);
    }
}