program class tabung menggunakan java

/*
 * I DEWA GDE AGUNG WIRA ADNYANA
* 10101056
 */

package soal1;

/**
 *
 * @authorWIRA_10101065
 */
import java.util.Scanner;
class tabung {
        int pilihan;       
        double r;
        double t;

        double luas(){
            double hasil1 = (2*3.14*r*r) + 2*3.14*r*t;
            return hasil1;
        }
        double volume(){
            double hasil2 = 3.14*r*r*t;
            return hasil2;
        }
        double kll(){
            double hasil3 = 2* (2*3.14*r*t);
            return hasil3;
        }
   
}

class tugas3arya{
public static void main(String[] args){

        System.out.println("       Program Menghitung L/V/Kll Tabung     ");
        System.out.println("---------------------------------------------");
        System.out.println("           I DEWA GDE AGUNG WIRA ADNYANA            ");
        System.out.println("                  10101056                  ");
        System.out.println("---------------------------------------------");
        System.out.println("");


        tabung tb = new tabung();
        Scanner input = new Scanner (System.in);
        System.out.println("MENU");
        System.out.println("1. Luas Tabung");
        System.out.println("2. Volume Tabung");
        System.out.println("3. Keliling Tabung");
        System.out.println("");
        System.out.printf("Masukkan Pilihan : ");
        System.out.println("");
        tb.pilihan = input.nextInt();
        System.out.println("");

        if(tb.pilihan == 1){
                System.out.println("--MENCARI LUAS TABUNG--");
                System.out.println("");
                System.out.printf("Masukkan Jari-jari : ");
                tb.r = input.nextInt();
                System.out.printf("Masukkan tinggi : ");
                tb.t = input.nextInt();
                System.out.println("");
                System.out.println("Luas Tabung dengan jari-jari " +tb.r + " dan tinggi " +tb.t + " : " +tb.luas());
                System.out.println("");

        }
            else if(tb.pilihan == 2){
                    System.out.println("--MENCARI VOLUME TABUNG--");
                    System.out.println("");
                    System.out.printf("Masukkan Jari-jari : ");
                    tb.r = input.nextInt();
                    System.out.printf("Masukkan tinggi : ");
                    tb.t = input.nextInt();
                    System.out.println("");
                    System.out.println("Volume Tabung dengan jari-jari " +tb.r + " dan tinggi " +tb.t + " : " +tb.volume());
                    System.out.println("");
            }
                   else if (tb.pilihan == 3) {
                        System.out.println("--MENCARI KELILING TABUNG--");
                        System.out.println("");
                        System.out.printf("Masukkan Jari-jari : ");
                        tb.r = input.nextInt();
                        System.out.printf("Masukkan tinggi : ");
                        tb.t = input.nextInt();
                        System.out.println("");
                        System.out.println("Keliling Tabung dengan jari-jari " +tb.r + " dan tinggi " +tb.t + " : " +tb.kll());
                        System.out.println("");
                 }

       
        else {
            System.out.println("MENU PILIHAN TIDAK TERSEDIA");
        }

                 
        }
}