Program java netbeans function

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package function;

import java.util.Scanner;

/**
 *
 * @author User
 */
public class Main {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here
        Scanner masukkan = new Scanner(System.in);
        int bil1,bil2,bil3,jumlah;
        System.out.println("program menjumlahkan 2 bilangan");
        System.out.print("masukkan bilangan 1:");bil1 = masukkan.nextInt();
        System.out.print("masukkan bilangan 2:");bil2 = masukkan.nextInt();
        System.out.print("masukkan bilangan 3:");bil3 = masukkan.nextInt();
         System.out.println();
        System.out.println("jumlah bilangan 1+bil2:"+(jumlah(bil1,bil2)));
        System.out.println("jumlah bilangan 2+bil3:"+(jumlah(bil2,bil3)));
        System.out.println("jumlah bilangan 1+bil3:"+(jumlah (bil1,bil3)));
    }

    private static int  jumlah(int a, int b) {
        int hasil = a + b;
        return hasil;

    }

}