java swing

import javax.swing.JOptionPane;
public class GameA{
    public static void main(String[] args) {
        String nama = " ";
        String alamat =" ";
        int n1;
        int n2;
        int n3;
        double hasilA;
        double hasilB;
        double hasilC;
        nama = JOptionPane.showInputDialog("Masukkan Nama Anda:");
        alamat = JOptionPane.showInputDialog("Masukkan Alamat Anda:");
        n1 = Integer.parseInt(JOptionPane.showInputDialog("Tanggal"));
        n2 = Integer.parseInt(JOptionPane.showInputDialog("Bulan"));
        n3 = Integer.parseInt(JOptionPane.showInputDialog("Tahun"));
        hasilA =(2018 - n3);
        hasilB =(n2 - 10);
        hasilC =(15 - n1);
        String msg = (" Data Kamu " + " \nNama :" + nama + " \nAlamat :" + alamat + " \nUmur : "
        + hasilA + " Tahun " + "lebih" + hasilB + " Bulan " + "dan"+ hasilC + " Hari ");
        JOptionPane.showMessageDialog(null, msg);


    }
}