18. The Catch or Specify Requirement

• Each Java program must follow this rule:

  • if a block of code can throw an exception, such block of code must be

    • (a) wrapped by a try statement that catches exceptions and handles them in the corresponding catch blocks.

      
      try {
          //a block of code that can throw an exception
      } catch (ExceptionType name) {
      
      }
      
      

    • (b) enclosed in a method with the throws clause, for example,

      
      public void saveFile() throws IOException {
          //a block of code that can throw an exception
      }///saveFile
      
      

• Otherwise, if Catch or Specify requirement is not honored, the code will not compile.