method return and cascading if statement issue

I am new to java, and to programming as a whole. trying to become a self taught programmer. i read books and solve exercise. the issue i face is lack of feedback. i feel it is a lonely journey. is there any place i can get feedback of codes that i write? as of now i appreciate any comments on this simple program i wrote to solve quadratic equations:

/*
 * Quadratic.java
 * ------------------
 * calculates the solutions of a quadratic equation (a*x^2 + b*x + c).
 * this program calculates only real solutions. constant a is assembly nonzero.
 */

 // to use input and output tools
 import java.util.Scanner;

 public class Quadratic {
/**
 * prompt user to enter a-b-c values, computes solutions, display result
 */
public static void main(String [] args) {
    // create scanner object to read values from user
    Scanner input = new Scanner(System.in);
    // prompt user to enter quadratic equation constants values (a,b,c)
    System.out.println("Enter coefficients for the quadratic equation:");
    // enter constant 'a' value
    System.out.println("a: ");
    double a = input.nextDouble();
    // enter constant 'b' value
    System.out.println("b: ");
    double b = input.nextDouble();
    // enter constant 'c' value
    System.out.println("c: ");
    double c = input.nextDouble();
    // calculate quadratic equation solution
    quadraticEquationSolver(a,b,c);
}

/**
 * calculates quadratic equation solutions and print it to screen
 * this method calculates only real solutions, in cases where that is not 
 * the case, a message to that effect is displayed on screen.
 */
private void quadraticEquationSolver(double a, double b, double c) {
    // calculate square delta. delta = b^2 - 4*a*c
    double deltaSquare = Math.pow(b, 2) - (4 * a *c);
    // check if deltaSquare is a negative or a non-negative
    if(deltaSquare < 0) {
        // the equation has no real solutions
        System.out.println("The equation has no real solutions");
        return;
    }else {
        // calculate delat = sqrt (squareDelta)
        double delta = Math.sqrt(deltaSquare);
        // calculate first solution
        double x1 = (-b + delta) / (2 * a);
        // calculate second solution
        double x2 = (-b - delta) / (2 * a);
        // display result, each solution on different line
        System.out.println("The first solution is " + x1);
        System.out.println("The second solution is " + x2);
        // in case solutions are equal, point it out 
        if (x1 == x2) System.out.println("both solutions are equal");
    }
}
}

• comments? is it too much? or just not the right way or words?
• return statement used in method quadraticEquationSolver, inside if statement then clause? is it ok? bad? any other alternative?

• if else statement, it could have been a cascaded if else statement like:

  if(deltaSquare < 0) {
      // the equation has no real solutions
      System.out.println("The equation has no real solutions");
      return;
  }else if (deltaSquare  == 0){
       // solutions are equal
       double solution = (-b ) / (2 * a);
       // display solution
       System.out.println("The first solution = The second solution = " + solution);
        } else {
              // calculate delat = sqrt (squareDelta)
              double delta = Math.sqrt(deltaSquare);
              // calculate first solution
              double x1 = (-b + delta) / (2 * a);
              // calculate second solution
              double x2 = (-b - delta) / (2 * a);
             // display result, each solution on different line
             System.out.println("The first solution is " + x1);
             System.out.println("The second solution is " + x2);
             }
  
  

  which approach is better, the detailed cascading if statement ? or the brief more general simple if else statement? , in terms of good software engineering.

  • method return: here i faced two challenges. 1) in then clause of if else statement, method should not return any value. how to handle a situation where in its most cases the method should return a value but in one or two case, it does not return anything? 2) in other cases the solution involves two values which is not possible for a method to return two values. i got around this situation by declaring a non return method which just communicates the results to the user directly. is it too bad to do that? or is it common ?

lastly, any comments you have to improve? from any point of view