codingan buat menghitung kubus,tabung,kerucut pada java

Kubus:import java.util.Scanner;
public class Kubus {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.println("Volume dan Luas Kubus");
System.out.print("panjang rusuk : ");
int a = input.nextInt();
System.out.print("Luas permukaan : "+ (6*(a*a)) + "\n");
System.out.println("Volume : " + (a*a*a));
}
}

Kerucut:import java.util.Scanner;
public class Kerucut {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.println("Volume dan Luas Kerucut");
System.out.print("jari-jari : ");
int r = input.nextInt();
System.out.print("garis pelukis : ");
int s = input.nextInt();
System.out.print("tinggi : ");
int t = input.nextInt();
double pi=3.14;
double luas_alas=3.14*r*r;
System.out.print("Luas alas : "+ (luas_alas)+ "\n");
System.out.print("Luas selimut : "+ (pi*r*s)+ "\n");
System.out.print("Luas permukaan : "+ (pi*r*(r+s)) + "\n");
System.out.println("Volume : " + (luas_alas*t*1/3));
}
}

Tabung:import java.util.Scanner;

public class VolumeTabung {
public static void main(String[] args){
Scanner input = new Scanner(System.in);

//deklarasi variabel
double v, r, d, t;
double phi = Math.PI;

//input nilai yang di ketahui
System.out.print("Masukkan nilai diameter tabung : ");
d = input.nextDouble();
System.out.print("Masukkan nilai panjang tabung : ");
t = input.nextDouble();

//proses
r = d / 2;
v = (phi * Math.pow(r, 2) * t);

//output
System.out.println("Volume Tabungnya adalah : " + v);
}
}

Saya Dapet Dari Guru saya (semoga membantu)