Plss help me solve this codes

Question

to those expert in java programming, i am new to java and i encounter a problem within my codes. You see, the program is supposed to be counting multiple numbers of the items as well as its price too. But i only can input 1 price i'll give you the code if you all don't really mind
import javax.swing.JOptionPane;
public class disc {
     public static void main (String[] args){
     String bil=JOptionPane.showInputDialog(null,"Bilangan barang ialah","Bilangan",JOptionPane.QUESTION_MESSAGE);
     int bil1=Integer.parseInt(bil);
     double jumlah=0; //jumlah harga
     double diskaun=0; //jumlah diskaun
     double jum=0; //jumlah selepas diskaun
     int i;
     int b=1;
     for (i=1; i<=bil1; i++){
     String Har=JOptionPane.showInputDialog(null,"Harga barang ke-"+b,"Harga",JOptionPane.QUESTION_MESSAGE);
     double harga=Double.parseDouble(Har);
     jumlah=jumlah+harga;
     b++;
     if (bil1>=1000){
          if (jumlah<=10.00)
          diskaun=jumlah*0.21;
          else
          if ((jumlah>=10.01) && (jumlah<=100.00))
          diskaun=jumlah*0.32;
          else
          diskaun=jumlah*0.43;
     else
     if ((bil1>=500) && (bil1<=999)){
          if (jumlah<=10.00)
          diskaun=jumlah*0.09;
          else
          if ((jumlah>=10.01) && (jumlah<=100.00))
          diskaun=jumlah*0.15;
          else
          diskaun=jumlah*0.21;
     else
     if ((bil1>=100) && (bil1<=499)){
          if (jumlah<=10.00)
          diskaun=jumlah*0.05;
          else
          if ((jumlah>=10.01) && (jumlah<=100.00))
          diskaun=jumlah*0.07;
          else
          diskaun=jumlah*0.09;
     else
     if ((bil1>=10) && (bil1<=99)){
          if ((jumlah>=10.01) && (jumlah<=100.00))
          diskaun=jumlah*0.02;
          else
          if (jumlah>=100.01)
          diskaun=jumlah*0.05;
     jum=jumlah-diskaun;
     JOptionPane.showMessageDialog (null,"Jumlah harga ialah RM" jumlah "Jumlah diskaun ialah RM" diskaun "Jumlah harga selepas diskaun ialah RM"+jum,"Jumlah",JOptionPane.INFORMATION_MESSAGE);
     System.exit(0);
plss help me solve the prob

Answer 1

I am having trouble understanding your code and question, partly to do with the formatting (as mentioned above), but also to do with the language barrier.
I don't know what I am being prompted for, and the variable names mean nothing to me, so translating these (even into broken English) would be a good start.
Secondly, you are saying you want two inputs (I think), but you only get to input bill once, this is because:
        String bil= JOptionPane.showInputDialog(null,"Bilangan barang ialah","Bilangan",JOptionPane.QUESTION_MESSAGE); is outside the FOR loop, so only run once. The only time you are asking for any input inside the loop is with:
            String Har=JOptionPane.showInputDialog(null,"Harga barang ke-"+b,"Harga",JOptionPane.QUESTION_MESSAGE);which is run several times.
If you want to take more than one ?bill?, you need to either implement another loop somewhere (either two separate loops or nested, depending what you are trying to do), or have another input dialog inside the loop.
I am sorry I cannot be more specific, this is only because I don't understand what you are trying to do.