Source code net beans aplikasi kalkulator

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package kalkulator;

import java.io.DataInputStream;
import java.io.IOException;
import java.util.Scanner;

/**
 *
 * @author gaara
 */
public class Kalkulator {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) throws IOException {
        // TODO code application logic here
        Scanner masuk = new Scanner(System.in);
        DataInputStream msk = new DataInputStream(System.in);       
        int nilai_1, nilai_2, hasil;
        char operator;
       
       
        System.out.println("====================");
        System.out.println("aplikasi kalkulator");
        System.out.println("====================");
       
        System.out.print("masukan nilai 1 : ");
        nilai_1 = masuk.nextInt();
       
        System.out.print("masukan nilai 2 : ");
        nilai_2 = masuk.nextInt();
       
        System.out.print("masukan operator : ");
        operator=(char)msk.read();
       
        if (operator == '+') {
            hasil = nilai_1 + nilai_2;
            System.out.println("jadi hasilnya : " + hasil);
        } else {
            if (operator == '-') {
                hasil = nilai_1 - nilai_2;
                System.out.println("jadi hasilnya : " + hasil);
            } else {
                if (operator == '/') {
                    hasil = nilai_1 / nilai_2;
                    System.out.println("jadi hasilnya : " + hasil);
                } else {
                    if (operator == '*') {
                        hasil = nilai_1 * nilai_2;
                        System.out.println("jadi hasilnya : " + hasil);
                    } else {
                        System.out.println("maaf anda goblok");
                       
                       
                    }
                }
            }
           
        }
       
       
       
       
    }
}