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Download SCJP Sun Certified Programmer for Java 6 Exam 310-065 by William Manning PDF

By William Manning

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Extra resources for SCJP Sun Certified Programmer for Java 6 Exam 310-065

Example text

3 Using Assertions Common use is to check preconditions, postconditions, and class invariants Preconditions are constraints that must be met to enter a method  If not met, the method should terminate immediately;  Constraints are typically functions of its arguments and the state of its object; and  Common form of precondition testing is argument range checking. Postconditions are constraints that must be met before returning from a method  If not met, the method does not return;  Constraints are typically functions of its return value and the state of its object; and  Identifies a failure within the method.

Static variables are referenced:  Through a reference to any instance of the class; and  Though the class name.  Static methods are not allowed to use non-static features of their class; and  Static methods are not concerned with individual instances of a class, can be invoked before a class instance is constructed. Instance methods have an implicit variable named this, which references the object executing the method 36  With non-static code, a variable or method can be referenced without specifying which object's variable or method intended.

Catch (Exception_type name) { 5. //Exception-handling code 6. }  The try block contains code that throws exceptions. 3 Managing Exceptions  When an exception happens, the JVM processes it  Processing starts with checking if the exception came from a try block  If from a try block, each catch block is check in order of appearance for compatibility with the exception. 4 Throwing Exceptions Methods can be written to throw exceptions. Process for throwing exceptions:  Decide if the exception should be checked at runtime  Choose the exception type 1.

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