validarCPF

package questao2;

import java.util.Scanner;

public class Validar {

    public void validarCPF(){
        Scanner sc = new Scanner(System.in);

        System.out.println("digite o cpf(11 digitos)");
        String CPF = sc.next();

        System.out.println(CPF.substring(0, 3) + "." + CPF.substring(3, 6) + "." +
                CPF.substring(6, 9) + "-" + CPF.substring(9, 11));
    }
}


//main
package questao2;

public class Main {
    public static void main(String[] args) {
        Validar validar = new Validar();

        validar.validarCPF();
    }
}