Uploaded byGirish Manwani
New features in Java 7
The document discusses new features in Java 7 including the ability to use strings in switch statements, catch multiple exceptions in a single catch block, improved generics with the diamond operator, underscore separators in long numbers, try-with-resources for automatic resource management, and new classes/interfaces in the collections API like Phaser and ThreadLocalRandom. It encourages visiting the listed blog for more information on Java 7 features.
New features in Java 7
- 1. Java 7 –New features Everything you wanted to know about Java 7 http://arraylist.blogspot.com
- 2. Java 7 –New features String data type in the switch block for the switch-case statement. public void getArea(FloorPlan fp) { String shape = fp.getShape(); switch (shape) { case SQUARE: calculateArea(fp.getLength()); break; case RECTANGLE: calculateArea(fp.getLength() * fp.getBreadth()); break; default: break; } } http://arraylist.blogspot.com
- 3. Java 7 –New features Enhanced catch block in the try-catch statement. A single catch block to catch multiple exception - where the exceptions are separated by pipes. try { someMethod(); } catch (ExceptionA | ExceptionB | ExceptionC e) { // handle exceptions } http://arraylist.blogspot.com
- 4. Java 7 –New features Collections api introduces - A lightweight fork/join framework. More classes – Phaser - a resuable and flexible synchronization barrier ThreadLocalRandom – generates a random number dedicated to the present thread. Interfaces - ConcurrentLinkedDeque ,TransferQueue . http://arraylist.blogspot.com
- 5. Java 7 –New features Improved Diamond(<>) operator in generics where the data type inside the <> generic operator of the left hand side is automatically inferred to the right hand side to improve readability and reduce code clutter. for example :- //previously List<Integer, List<String>> list = new ArrayList<Integer, List<String>>(); //in jdk7 List<Integer, List<String>> list = new ArrayList<>(); http://arraylist.blogspot.com
- 6. Java 7 –New features Numerical literals Long numbers are easier to read and neatly identified using numerical literals Now 1 million can be declared in a more readable way. Old int onemillion = 1000000; New int onemillion = 1_000_000; http://arraylist.blogspot.com
- 7. Java 7 –New features The enhanced try statement as try-with-resource try(FileInputStream fis = new FileInputStream("somefile.txt")){ //do something } http://arraylist.blogspot.com
- 8. Java 7 –New features For more interesting stuff visit http://arraylist.blogspot.com http://arraylist.blogspot.com