Question

Write a complete java program that Define a class named sample containing:

• A method named division that receives two integers x and y and returns the division of the two numbers. It must handle any possible exceptions.
• A method named printArray that receives an array of double arr and an integer index and prints the element in the positon index. It must handle any possible exceptions.
• main method that recievs input from user and repeat if wrong input. Then it should call the other methods.
• A sample output:

Please enter two numbers to divide: 10 Hi

You entered wrong input. Try again.

Please enter two numbers to divide: 15 0

Division could not be completed.

Enter 5 double numbers: 2.5 3.1 5.0 9.3 10.0

Which element you want to print? (Choose a number between 0-4): 7

Wrong choice. Try again.

Which element you want to print? (Choose a number between 0-4): 3

The element in position 3 = 9.3

Thank you for using this program.

Answer 1

Sample.java

import java.util.Scanner;

//Write a complete java program that Define a class named sample containing:
public class Sample
{
   //A method named division that
   //receives two integers x and y and returns the division of the two numbers.
   double division(double a, double b)
   {
       //denominator cannot be 0
       if(b==0)
       {
           System.out.println("Division could not be completed");
           return 0.0;
       }
       double result = a/b;
  
   //It must handle any possible exceptions.
       return result;
   }
  
   //A method named printArray that receives an array of double arr and an integer index and prints the element in the positon index.
   double printArray(double arr[], int index)
   {
       double result = 0.0;
       if(index < 0 || index > 4)
       {
           throw new NumberFormatException();
       }
       result = arr[index];
       //It must handle any possible exceptions.
      
       return result;
   }

  
   //main method that recievs input from user and repeat if wrong input. Then it should call the other methods.
   public static void main(String args[])
   {
       Scanner sc = new Scanner(System.in);
       Sample s = new Sample();
         
       while(true)
       {
         
           System.out.println("Please enter two numbers to divide");
           String first = sc.next();
           String second = sc.next();
           try
           {
               double num1 = Double.parseDouble(first);
               double num2 = Double.parseDouble(second);
               double result = s.division(num1, num2);
               if(num1 != 0.0 && result == 0.0)
               {
                 
               }
               else
               {
                   System.out.println("Division of "+num1+" by "+num2+" is "+result);
               }
               break; // this line will come if both num1 and num2 are valid numbers
           }
           catch (NumberFormatException nfe)
           {
           System.out.println("You entered wrong input. Try again");
           }
       }
         
       while(true)
       {
         
           System.out.println("Enter 5 double numbers:");
           String first = sc.next();
           String second = sc.next();
           String third = sc.next();
           String fourth = sc.next();
           String fifth = sc.next();

           try
           {
               double arr[] = new double[5];
               arr[0] = Double.parseDouble(first);
               arr[1] = Double.parseDouble(second);
               arr[2] = Double.parseDouble(third);
               arr[3] = Double.parseDouble(fourth);
               arr[4] = Double.parseDouble(fifth);
               System.out.println("Which element you want to print? (Choose a number between 0-4): ");
               String option = sc.next();
               int i = Integer.parseInt(option);
                 
               double result = s.printArray(arr, i);
               System.out.println("The element in position "+i+" = "+result);
               break; // this line will come if all numbers in array are valid numbers
           }
           catch (NumberFormatException nfe)
           {
           System.out.println("Wrong choice. Try again");
           }
       }
         
       System.out.println("Thank you for using this program");
         
       sc.close();
      
   }
}

Sample I/O and output