Java 7 Features

1. String Pool - is now stored in Heap instead of Permgen
2. Try with Resources

try (BufferedReader br = new BufferedReader(new FileReader(path)) {
   return br.readLine();
}

Underscores in numeric literals

int one_million = 1_000_000;

Strings in switch
Improved Type Inference for Generic Instance Creation

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

Multiple exception catching

    catch (FirstException | SecondException ex) {
        logger.error(ex);
        throw ex;
    }

The java.nio.file package
Concurrency and collections updates (jsr166y)

    A lightweight fork/join framework, flexible and reusable synchronization barriers, transfer         queues, concurrent linked double-ended queues, and thread-local pseudo-random number       generators

The Garbage-First Garbage Collector