Why write Try-With-Resources without Catch or Finally?

Question

Why write Try without a Catch or Finally as in the following example?

protected void processRequest(HttpServletRequest request, HttpServletResponse response)         


        

Answer 1

This is a new feature in Java 7 and beyond. Without this, you'd need a finally block which closes the resource PrintWriter out. So the code above is equivalent to:

PrintWriter out = null;
try {
    PrintWriter out = ...
} finally {
    if(null != out) {
        try {
            out.close();
        } catch(Exception e) {} // silently ignore!
    }
}

See The try-with-resources Statement