Java Software Solutions > PP1.2 > Solution

Problem:

Introduce the following errors, one at a time, to the program
from PP 1.1. Record any error messages that the compiler produces.
Fix the previous error each time before you introduce a
new one. If no error messages are produced, explain why. Try to
predict what will happen before you make each change.
a. change Test to test
b. change Emergency to emergency
c. remove the first quotation mark in the string
d. remove the last quotation mark in the string
e. change main to man
f. change println to bogus
g. remove the semicolon at the end of the println statement
h. remove the last brace in the program

Output:

Not available.

Solution:

class Test2
{
   //-----------------------------------------------------------------
   //  Tests various modifications to the program.
   //-----------------------------------------------------------------
   public static void main (String[] args)
   {
      System.out.println ("An Emergency Broadcast");
   }
}
//
//  a. Change Test to test
//
//     The compiler produces the bytecode file name based on the
//     class name (not the source code file name), so the bytecode
//     file name has a lower case t.
//
//  b. Change Emergency to emergency
//
//     The program compiles fine, and when executed prints the word
//     emergency with a lower case e.
//
//  c. Remove the first quotation mark in the string literal
//
//     The compiler produces an error: String not terminated at end
//     of line. It interpreted the last quote as the beginning of
//     a new string literal.
//
//  d. Remove the last quotation mark in the string literal
//
//     The compiler produces the same error as in part c.
//
//  e. Change main to man
//
//     The program compiles, but when submitted to the interpreter
//     it complains that the main method could not be found.
//
//  f. Change println to bogus
//
//     The compiler produces an error that says method bogus is not
//     found in class java.io.PrintStream.
//
//  g. Change Broadcast to Brxoadxcaxst
//
//     As with part b, the output changes to reflect the changes
//     made to the string literal.
//
//  h. Remove the semicolon at the end of the println statement
//
//     The compiler produces an error indicating that there is a
//     semicolon missing at the end of the println statement.
//
//  i. Remove the last brace in the program
//
//     The compiler produces an error indicating that there should
//     be a brace at the end of the program.
//