Covered topic in Java 7 Presentation (Project Coin): • Java Language enhancement history from version JDK 1.1 to Java 7 • Definition of Java7 Project Coin from JSR 334 Lead Joseph D.Darcy’s • Java 7 Language enhancement 1. String in Switch(alternative for if else statement with String) 2. Binary Literal(0B) and Underscore in literal for more readability (int binary=10_1) 3. Multi catch and more precious rethrow 4. Try with resource statement(Automatic resource management) 5. Diamond Operator(Generics) 6. Improved Compiler warning for varargs.

1. Tossing the Project Coin! Marimuthu Rajagopal

5. String in Switch Java 6 and Prior public static String getTypeOfDayWithSwitchStatement(String dayOfWeekArg) { String typeOfDay=""; if(dayOfWeekArg.equals("Monday")) typeOfDay="Start of Work week"; else if(dayOfWeekArg.equals("Tuesday")|| dayOfWeekArg.equals("Wednesday")|| dayOfWeekArg.equals("Thursday")) typeOfDay="Midweek"; else if(dayOfWeekArg.equals("Friday")) typeOfDay="End of work week"; else if(dayOfWeekArg.equals("Saturday")|| dayOfWeekArg.equals("Sunday")) typeOfDay="Week off"; else typeOfDay="Invalid day"; return typeOfDay; } http://download.java.net/jdk7/docs/technotes/guides/language/strings-switch.html

6. String in Switch Java 7 public static String getTypeOfDayWithSwitchStatement(String dayOfWeekArg) { String typeOfDay=""; switch (dayOfWeekArg) { case "Monday": typeOfDay="Start of Work week"; break; case "Tuesday": case "Wednesday": case "Thursday": typeOfDay="Midweek"; break; case "Friday": typeOfDay="End of work week"; break; case "Saturday": case "Sunday": typeOfDay="Week off"; break; default: typeOfDay="Invalid day"; break; } return typeOfDay; } http://download.java.net/jdk7/docs/technotes/guides/language/strings-switch.html

10. Multi-Catch. Java 6 and Prior try{ // Method method=Object.class.getMethod("toString"); final Class[] ARG_TYPE=new Class[]{String.class}; Method method=Integer.class.getMethod("parseInt",ARG_TYPE); Object result=method.invoke(null,new Object[]{new String("44")}); System.out.println("result:"+result.toString()); } catch(NoSuchMethodException e) { e.printStackTrace(); }catch(IllegalAccessException e) { e.printStackTrace(); } catch(InvocationTargetException e) { e.printStackTrace(); }

11. Multi-Catch. Java 7 try{ // Method method=Object.class.getMethod("toString"); final Class[] ARG_TYPE=new Class[]{String.class}; Method method=Integer.class.getMethod("parseInt",ARG_TYPE); Object result=method.invoke(null,new Object[]{new String("44")}); System.out.println("result:"+result.toString()); } catch( NoSuchMethodException | IllegalAccessException | InvocationTargetException e) { e.printStackTrace(); }

12. More precise rethrow. Java 6 and Prior public static void precise() throws NoSuchMethodException, IllegalAccessException { try{ // Method method=Object.class.getMethod("toString"); final Class[] ARG_TYPE=new Class[]{String.class}; Method method=Integer.class.getMethod("parseInt",ARG_TYPE); Object result=method.invoke(null,new Object[]{new String("44")}); System.out.println("result:"+result.toString()); } catch(Exception e) { throw new NoSuchMethodException(); } }

13. More precise rethrow. Java 7 public static void precise() throws NoSuchMethodException, IllegalAccessException, InvocationTargetException { try{ // Method method=Object.class.getMethod("toString"); final Class[] ARG_TYPE=new Class[]{String.class}; Method method=Integer.class.getMethod("parseInt",ARG_TYPE); Object result=method.invoke(null,new Object[]{new String("44")}); System.out.println("result:"+result.toString()); } catch(ReflectiveOperationException e) { throw e; } }

15. Try-with-Resources statement. Java 6 and Prior static void jdk16writeFile(String path) { BufferedWriter bw = null; try { bw=new BufferedWriter(new FileWriter(path)); bw.write("JDK1.6 Need to close resource manualy."); }catch(IOException e) { e.printStackTrace(); } finally { try { bw.close(); } catch (IOException ex) { ex.printStackTrace(); } } }

16. Try-with-Resources statement. Java 7 static void jdk17writeFile(String path) { try (BufferedWriter bw = new BufferedWriter(new FileWriter(path))) { bw.write("Welcome to JDK1.7 Try with resource concept"); } catch(IOException ex) ‏ { System.out.println("ex"+ex); } }

18. Diamond Operator(Type Inference for Generic Instance Creation) ‏ In Java 6 and Prior List<String> jvmLanguages=new ArrayList<String>(); In Java 7 List<String> jvmLanguages=new ArrayList<>(); jvmLanguages.add(&quot;Groovy&quot;); jvmLanguages.add(&quot;Scala&quot;); System.out.println(jvmLanguages); Type Inference List<?> typeinference=new ArrayList<> ();

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