Perhitungan Sederhana dengan Input dari Keyboard

import java.io.*;
public class Contoh5 {
 public static void main(String[] args) throws IOException {
    BufferedReader x=new BufferedReader(new InputStreamReader(System.in));
   
    //input a1
    String a1 = "";
    System.out.print("Angka 1 = ");
    a1 = x.readLine();    

    //input a2
    String a2 = "";
    System.out.print("Angka 2 = ");
    a2 = x.readLine();

    //ubah a1 dan a2 mjd int
    int b1,b2;
    b1=Integer.parseInt(a1);
    b2=Integer.parseInt(a2);

    int a3;
    a3=b1+b2;
    System.out.println("Hasil = "+a3);
 }
}