Chapter 11, Problem 14RE

Explanation of Solution

Explanation:

• The “try”-with-resources statement ensures that a resource is closed when the statement ends normally or abruptly.
• To use this statement, the programmer needs to declare the needed resources within the parenthesis, and the built resource will be closed automatically at the end of the block.
• When closing resources, the programmer must use “try”-with-resources instructions.
• Consider the following sequence of statements:

//Create an instance variable

PrintWriter pout = new PrintWriter(file_name);

//Call the method

writeData(pout);

//Call close() method

pout...

Explanation of Solution

Type of exception being caught:

• An exception is a problem that comes during the program execution.
• An exception caught by a surrounding “catch” clause depends on the exception type being caught by the “catch” clause...

Explanation of Solution

A sample program:

• When the programmer uses a resource, which should be closed, like a “PrintWriter”, the programmer requires to be careful in the presence of exceptions.
• Consider the following sequence of statements:

//Create an instance variable

PrintWriter pout = new PrintWriter(file_name);

//Call the method

writeData(pout);

//Call close() method

pout.close();

• Let assume that one of the methods prior to the last line throws an exception.
• Then the invocation to the method “close()” is never executed.
• The data that was written to the stream may never end up in the file.
• Therefore, the programmer uses the try-with-resources statement...