Version 1

/*
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 */
package shape;  

/**
 *
 * @author S346680274
 *///import java.lang.Math.*;
import java.util.Scanner;
import java.util.InputMismatchException;

public class Shape {
    double area;
    double perimeter;
    double length;
    double width;
  
    
        public double checkValue(String statement){
        System.out.print(statement);
        Scanner input = new Scanner(System.in);
        double num1;
        while (true){
            try{
                num1=input.nextDouble();
                if (num1>0){
                    break;
                }
                else{
                    System.out.print("Please enter a positive number!");
                }
            }
            catch (InputMismatchException err){
                input.next();
                System.out.print("The value entered is not a number. Please try again."+statement);
            }
        }
        return num1;
    }
        public void userInput(){
        Scanner input = new Scanner(System.in);
        System.out.println("Enter the width");
        this.width=checkValue("width: ");
        System.out.println("Enter the length");
        this.length=checkValue("length: ");    
    }
      


    public double area(){
        return (this.width*this.length);
    };
    
   public double perimeter(){
       return (2*(this.width+this.length));
   }