By Jeanne Boyarsky, Scott Selikoff
Whole, relied on guidance for the Java Programmer II examination OCP: Oracle qualified specialist Java SE eight Programmer II research Guide is your finished significant other for getting ready for examination 1Z0-809 in addition to improve examination 1Z0-810 and examination 1Z0-813.
With complete assurance of a hundred% of examination pursuits, this worthwhile advisor reinforces what you recognize, teaches you what you don't be aware of, and offers you the hands-on perform you must increase your abilities. Written via professional Java builders, this ebook is going past mere examination prep with the perception, reasons and views that come from years of expertise. You'll evaluate the fundamentals of object-oriented programming, comprehend practical programming, follow your wisdom to database paintings, and lots more and plenty extra. From the fundamental to the complex, this consultant walks you thru every thing you want to be aware of to hopefully take the OCP 1Z0-809 examination and improve tests 1Z0-810 and 1Z0-813.
Java eight represents the most important adjustments to the language so far, and the newest examination now calls for that you simply display sensible programming competence that allows you to move.
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If you're able to take your next step on your IT profession, OCP: Oracle qualified expert Java SE eight Programmer II research Guide is your perfect better half at the street to certification.
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Extra info for OCP: Oracle Certified Professional Java Se 8 Programmer II Study Guide: Exam 1Z0-809
F. A compiler error occurs on another line. 3. What is the result of executing the following code? readObject(); 19: } 20: } 21: } xl Assessment Test A. It compiles and runs without issue. B. The code will not compile because of line 3. C. The code will not compile because of line 5. D. The code will not compile because of lines 16–17. E. The code will not compile because of line 18. F. It compiles but throws an exception at runtime. 4. What is the result of the following class? getValue()); } } A.
All Java classes inherit from Object, which means that x instanceof Object is usually true, except for one case where it is false. If the literal null or a variable reference pointing to null is used to check instanceof, the result is false. null is not an Object. For example: 26: 27: 28: 29: HeavyAnimal hippo = new Hippo(); boolean b4 = hippo instanceof Object; Hippo nullHippo = null; boolean b5 = nullHippo instanceof Object; // true // false Line 27 returns true because Hippo extends from Object indirectly as do all classes.
Annotating Overridden Methods You already know how to override a method. Java provides a way to indicate explicitly in the code that a method is being overridden. In Java, when you see code that begins with an @ symbol, it is an annotation. An annotation is extra information about the program, and it is a type of metadata. It can be used by the compiler or even at runtime. 12 Chapter 1 ■ Advanced Class Design The @Override annotation is used to express that you, the programmer, intend for this method to override one in a superclass or implement one from an interface.