Scala for Java Developers by Toby Weston

Author:Toby Weston
Language: eng
Format: epub, pdf
Publisher: Apress, Berkeley, CA

We start with a URL to attempt to download. This can throw a MalformedURLException. As it’s a checked exception, we’re forced to deal with it. We then create a Reader and open a stream from the URL ready for reading. This can throw another exception, so we’re forced to deal with that too.

When we start reading, the readLine method can also throw an exception but that’s handled by the existing catch. To make sure we clean up properly in the event of an exception here, we close the reader in a finally block.

If we want to use Java 7’s try-with-resources construct, we can avoid the finally clause. The try-with-resources syntax will automatically call close on the reader.

// java

try {

URL url = new URL("http://baddotrobot.com");

try (BufferedReader reader = new BufferedReader(

new InputStreamReader(url.openStream()))) {

String line;

while ((line = reader.readLine()) != null)

System.out.println(line);

}

} catch (MalformedURLException e) {

System.out.println("Bad URL");

} catch (IOException e) {

System.out.println("Problem reading data: " + e.getMessage());

}

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