Code examples for new features in Java 1.7

Automatic Resource Management

this:

BufferedReader br = new BufferedReader(new FileReader(path));

try {

   return br.readLine();

} finally {

   br.close();

}

becomes:

try (BufferedReader br = new BufferedReader(new FileReader(path)) {

   return br.readLine();

}

You can declare more than one resource to close:

try (

   InputStream in = new FileInputStream(src);

   OutputStream out = new FileOutputStream(dest))

{

 // code

}

Underscores in numeric literals

int one_million = 1_000_000;

Strings in switch

String s = ...

switch(s) {

 case "quux":

    processQuux(s);

    // fall-through

case "foo":

  case "bar":

    processFooOrBar(s);

    break;

case "baz":

     processBaz(s);

    // fall-through

default:

    processDefault(s);

    break;

}

Binary literals

int binary = 0b1001_1001;

Improved Type Inference for Generic Instance Creation

Map<String, List<String>> anagrams = new HashMap<String, List<String>>();
become:
Map<String, List<String>> anagrams = new HashMap<>();

Better exception handling

this:

} catch (FirstException ex) {

     logger.error(ex);

     throw ex;

} catch (SecondException ex) {

     logger.error(ex);

     throw ex;

}

become:

} catch (FirstException | SecondException ex) {

     logger.error(ex);

    throw ex;

}