Java 7 introduced several new features including the diamond operator <> for type inference, strings in switch statements, automatic resource management using try-with-resources, numeric literals with underscores, binary literals, improved exception handling with multi-catch blocks, NIO 2.0 for file I/O, and the Fork/Join framework for parallel programming.

1. Java 7 New Features

2. Diamond Operator
Map<String, List<Offer>> offers = new HashMap<>();

3. Strings in switch statements
String status = offer.getStatus();
switch(status) {
case NEW:
newOffer(offer); Case Label
break;
case PENDING: toString()
pendingOffer(offer);
break;
default:
break;
}

4. Automatic Resource
Management
Automatic close Multiple Resources
try(FileOutputStream fos = new FileOutputStream(“movies.txt”);
DataOutputStream dos = new DataOutputStream(fos)) {
dos.writeUTF(“Java 7 New Features”)
} catch (IOException e) {
...
}
Implements java.lang.AutoCloseable
try-with-resources statement

5. Numeric literals with
underscore
int thousand = 1_000;
int million = 1_000_000;

6. Binary literals
int two = 0b10;
int forty = 0b101_000;

7. Improved exception handling
try {
methodThatThrowsThreeExceptions();
} catch (ExceptionOne | ExceptionTwo | ExceptionThree e) {
...
}
Multi-catch block

8. NIO 2.0
● Working with Path: Path, Paths,
FileSystem, FileSystems, ...
● File change notifications: WatchService,
WatchKey

9. Fork and Join Framework
● ForkJoinPool int numberOfProcessors =
Runtime.getRunTime().availableProcessors();
● RecursiveAction ForkJoinPool pool = new
(void compute()) ForkJoinPool(numberOfProcessors)
…
● RecursiveTask<V>
public class BigProblemTask extends
(V compute()) RecursiveAction {
@Override
protected void compute() {
// your problem invocation goes here
}
}
…
pool.invoke(task);