Chapter 7.4, Problem 21SC

Explanation of Solution

Given statement:

//definition of "writeAll" method

public static void writeAll (String[] lines, String filename)

{

    //create an object for "PrintWriter" class

    PrintWriter out = new PrintWriter (filename);

    //check the "for" condition

    for (String line : lines)

    {

        //display the uppercases in the file

        out.println (line.toUpperCase ());

    }

    //close the file

    out.close ();

}

Errors in the statement:

Error #1:

The “PrintWriter” constructor can throw a “FileNotFoundException” because, the user shouldn’t supply a “throws” clause.

Error #2:

A “NullPointerException” is thrown when one of the array elements is null...