By Tushar Sharma, S.G. Ganesh, Hari Kiran Kumar
This e-book is a finished, step by step and one-stop consultant for the Java SE eight Programmer II examination (IZ0-809). Salient positive aspects of this booklet comprise: a hundred% insurance of the examination themes, a full-length mock examination, perform examination questions, examination notes and assistance.
Oracle qualified specialist Java SE eight Programmer II consultant (Exam IZ0-809) is a complete advisor for the OCPJP eight examination.
The e-book begins via answering commonly asked questions on the OCPJP eight examination (Chapter 1). The e-book maps every one examination subject right into a bankruptcy and covers a hundred% of the examination subject matters (next 12 Chapters). examination themes are mentioned utilizing various programming and real-world examples. each one bankruptcy ends with perform examination questions and a short precis that revises key options lined within the bankruptcy from examination standpoint.
After examining the most chapters, you could take the full-length mock examination to make sure that you could have adequate perform prior to truly taking the examination (Chapter 14).
If you're an OCPJP eight examination aspirant, this booklet is unquestionably for you. This publication assumes that you're already conversant in Java basics (that is in keeping with the prerequisite of getting a OCAJP eight certification earlier than you are taking up the OCPJP eight exam).
This ebook might be a tasty learn to you as a result of its uncomplicated language, instance pushed process, easy-to-read kind, and entire concentration in the direction of the examination.
Salient positive factors
• In-depth and a hundred% insurance of all 12 examination issues for the certification
• quite a few illustrative programming and real-world examples
• thousands of perform examination questions (including a full-length mock exam)
What you are going to research:
• Have the mandatory wisdom to transparent the examination considering a hundred% of the examination issues are lined to the necessary intensity
• in actual fact comprehend the scope and pursuits of the examination, the technical issues lined within the examination, and sort and level-of-difficulty of the examination questions (in brief, you are going to truly understand what’s precisely required for passing the examination)
• get into an “exam mindset” by means of testing thousands of perform examination questions.
Read or Download Oracle Certified Professional Java SE 8 Programmer Exam 1Z0-809: A Comprehensive OCPJP 8 Certification Guide PDF
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Additional resources for Oracle Certified Professional Java SE 8 Programmer Exam 1Z0-809: A Comprehensive OCPJP 8 Certification Guide
It has a private constructor and a static method to get the singleton object. Figure 2-2. UML class diagram of a singleton class The singleton class offers two things: one and only one instance of the class, and a global single point of access to that object. Assume that you want to implement a class for logging application details for tracing the application execution for debugging. For this objective, you may want to ensure that only one instance of Logger class exists in your application, and hence you can make Logger class a singleton class (see Listing 2-19).
3. The third method call is aMethod(i), where the variable i is of type Integer. There is no aMethod definition that takes Integer as an argument. The closest match is aMethod(Object val), so it is called. Why not aMethod(int val)? For finding the closest match, the compiler allows implicit upcasts, not downcasts, so aMethod(int val) is not considered. 4. The last method call is aMethod("9"). The argument is a String type. Since there is an exact match, aMethod(String val) is called. This process of the compiler trying to resolve the method call from given overloaded method definitions is called overload resolution.
Copy(); } } This code will give a compiler error of "incompatible types: Shape cannot be converted to Circle". copy();". copy(); Since it is tedious to provide such downcasts (which are more or less meaningless), Java provides covariant return types where you can give the derived class of the return type in the overriding method. copy(); is valid and no explicit downcast is needed (which is good). Overriding equals() Method Let’s now override equals method in the Point class. Before that, here is the signature of the equals() method in the Object class: public boolean equals(Object obj) The equals() method in the Object class is an overridable method that takes the Object type as an argument.