Java 7 Ocp - Upgrade

Front 1

Switch statement

Back 1

We can use a String object

Front 2

Integral types (byte, short, int, long)

Back 2

Can be expressed using the binary number system

Front 3

Binary literals

Back 3

Can be used in a switch statement (just like any integral type)

Front 4

Numerical literals with underscore

Back 4

-We can use any number of underscore characters "_" anywhere between digits in a numerical literal
-Not at the beginning or end of a number
-Not adjacent to a decimal point
-Not prior to an F or L suffix

Front 5

try-catch with multiple handlers

Back 5

-Each handler is checked in order (top-down)
-The handler that first matches is executed

Front 6

multi-catch statement

Back 6

-We can combine a catch clause into a single block of code
-If a catch block handles more than one exception type, then the catch parameter is implicitly final
-try { } catch(IOException | SQLException ex) { }

Front 7

AutoClosable

Back 7

Classes that implements AutoClosable can be used as part of try-catch block

try (AutoClosable ae) { }

Front 8

Handling resources

Back 8

-The new syntax allows to declare resources that are part of the try block.
-The runtime automatically closes the resources after the execution of the try block

Front 9

Rethrowing exceptions

Back 9

-The Java compiler can determine that the exception thrown by the statement throw "e" must have come from the try block

Front 10

Rethrowing exceptions

Back 10

The analysis is disabled if the catch parameter is assigned to another value in the catch block

Front 11

Rethrowing exceptions

Back 11

If the catch parameter is assigned to another value, we must specify the exception type Exception in the throws clause of the method declaration

Front 12

Rethrowing exceptions

Back 12

The compiler verifies that the type of the rethrown exception meets:
-The try block is able to throw it
-There are no other preceding catch blocks that can handle it
-It is a subtype or supertype of one of the catch clause's exception parameters

Front 13

Diamond operator

Back 13

We can replace the type arguments required to invoke the constructor of a generic class with an empty set of type parameters (<>) as long as the compiler can determine, or infer, the type arguments from the context

Front 14

Diamond operator

Back 14

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

Map<String, List<String>> productMap = HashMap<>();