Best way to get data from a text file and then put it in an array of Solids?

[jubbiejub]

I am writing a program that uses inheritance and polymorphism to sort solids.

Here is my Solids class, which is the parent of Rectangular, Sphere, and Cube.

import java.text.DecimalFormat;

public abstract class Solid {

	private String solidName;
	DecimalFormat roundHundreth = new DecimalFormat("#.##");
	
	//constructor for setting name to a default value
	//preconditions:none
	//postconditions:sets solidName to undefined
	public Solid(){
		solidName = "undefined";
	}
	
	//method for setting name to method argument
	//preconditions: must enter a String argument
	//postconditions: will set solidName to name
	public void setName(String name){
		solidName = name;
	}
	
	//getter method for Solid name
	//preconditions: none
	//postconditions: will return solidName
	public String getName(){
		return solidName;
	}
	
	
	//abstract method declarations
	public abstract double volume();
	
	public abstract double surface();
	
	public abstract void display();
		
	
	
	
}

And here is what one of child classes look like.

public class Rectangular extends Solid {
	
	private double length;
	private double width;
	private double height;
	
	public Rectangular(){
		setName("undefined");
	}
	
	public Rectangular(double len, double wid, double hei){
		
		setName("Rectangular");
		length = len;
		width = wid;
		height = hei;
	}
	

	public double volume() {
		//method to return volume of a rectangular prism
		//preconditions: must use defined constructor while instantiating Rectangular 
		//postconditions: computes and returns volume
		
		double vol = length*width*height;
		return vol;
	}

	
	public double surface() {
		//method to return surface area of a rectangular prism
		//preconditions: must use defined constructor while instantiating Rectangular 
		//postconditions: computes and returns surface area
		
		double surfaceArea = 2*length*height + 2*height*width + 2*length*width;
		return surfaceArea;
	}

	
	public void display() {
		//method to display info on a rectangular prism
		//postconditions: none
		//postconditions: displays information related to a rectangular prism
		
		System.out.printf("Rectangular Prism -- Length: %s   Width: %s   Height: %s   Volume: %s   Surface Area: %s\n", roundHundreth.format(length), roundHundreth.format(width), roundHundreth.format(height), roundHundreth.format(volume()), roundHundreth.format(surface()));
		
	}
}

I am wondering what the most efficient way to sort this text into an object of their respective class. (S = Sphere, etc) I already have a way to do it, but I feel like it could be far more efficient. How would you go about it?

S 0.5
R 1.5 5.2 3.75
R 40.0 1.0 1.0
C 0.75
C 7.5
C 75.0
S 37.5
S 1.0
S 1.25
R 74.0 76.0 11.5
C 3.14
C 1.77

[Sierra]

What I see of your code seems ok so far - though I would change the name display() to toString(). What part of the posted code is your concern?