In java language Question 1 Write a method to read in two pieces of information

Question

In java language

Question 1

Write a method to read in two pieces of information from a user (using a Scanner object).

First, read in the name of a file. Using this name, create a file object to be returned from the method.

Use exception handling so that the code will compile.

Second, read in the number of lines in the file and store this in an int.

Use exception handling to account for the user typing a non-number.

If the user enters in a proper number, print it back out to the user before returning the file.

Note: you are not opening or reading from the file or checking the number- you are just creating the File object and returning it (presumably to be dealt with elsewhere).

Here is the method header- use this exact header with no changes:

public File readFileAndLength()

Explanation / Answer

Solution: Create a method to read in two pieces of information from a user as Shown below and Use Expection to read in the number of lines in the file

Case 1:

// Programmer-declared method user.

   import java.util.Scanner;

    public class userFinder

   {

      // obtain three floating-point values and locate the user value

      public void determineUser()

      {

       // create Scanner for input from command window

        Scanner input = new Scanner( System.in );

       // obtain user input

          System.out.print("Enter three floating-point values separated by spaces: " );

        double user1 = input.nextDouble(); // read first double

        double user2 = input.nextDouble(); // read second double

        double user3 = input.nextDouble(); // read third double

      // determine the user value

        double result = user( user1, user2, user3 );

       // display user value

          System.out.println( "user is: " + result );

    } // end method determineUser

      // returns the User of its three double parameters         

       public double user( double x, double y, double z )         

     {                                                              

          double userValue = x; // assume x is the largest to start

          // determine whether y is greater than userValue        

          if ( y > userValue )                                   

            userValue = y;                                       

          // determine whether z is greater than userValue        

          if ( z > userValue )                                    

            userValue = z;                                        

            return userValue;                                       

       } // end method user                                      

    } // end class userFinder

Case 2:

import java.util.Scanner;

import java.io.File;

import java.io.FileNotFoundException;

public class TryCatchFinally {

   public static void main(String[] args) {

      try {         // main logic

         System.out.println("Start of the main logic");

         System.out.println("Try opening a file ...");

         Scanner in = new Scanner(new File("test.in"));

         System.out.println("File Found, processing the file ...");

         System.out.println("End of the main logic");

      } catch (FileNotFoundException ex)

        {    // error handling separated from the main logic

         System.out.println("File Not Found caught ...");

      } finally {   // always run regardless of exception status

         System.out.println("finally-block runs regardless of the state of exception");

      }

      // after the try-catch-finally

      System.out.println("After try-catch-finally, life goes on...");

   }

}

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