Download Complete Java 2 certification: study guide by Philip Heller PDF

By Philip Heller

Here's a revised and more advantageous variation of the main respected Java certification consultant, with in-depth assurance of the newest types of the Java Programmer and Developer assessments. Written by way of the folk who really created the assessments for sunlight, this insider's consultant will arrange you to take those sizzling checks with self belief. Sybex learn publications are jam-packed with unparalleled learn tools--hundreds of demanding overview questions and digital flashcards that aid strengthen key issues, and real-world situations that supply views and insights from pro pros. The CD contains a sophisticated trying out engine with hundreds of thousands of pattern examination questions and the total e-book in PDF.

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Java. java. The namespace of a Java source file contains the names of all classes and interfaces in the source file’s package. In other words, within the source file you may refer to any class by its short name; classes outside the package must be called by their complete names. Suppose the current package contains a class named Formula. The following code creates an instance of Formula and an instance of Vector: 1. Formula f = new Formula(); 2. Vector(); Line 2 is a mess. util package, so it must be referred to by its full name…twice!

24. B. Due to the rules of widening conversions, the integer value of x cannot be automatically converted to a byte. The assignment of the variable x to the variable b would require an explicit cast. This cast could result in a loss of data, though. See Chapter 4 for more information. 25. A, B, C. 0’s boxing and unboxing functionality. See Chapter 8 for details. C is a legal assignment, but D is an illegal assignment that requires a cast; see Chapter 4 for details. 26. D. Both String variables are assigned the same string, “test string”.

12. 13. 14. 15. held++; } } } What value is printed out at line 6? A. 0 B. 1 C. 100 D. 101 7. Consider the following application: 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 0; } } Review Questions 31 What value is printed out at line 6? A. 0 B. 0 C. 3 D. 3 8. How can you force garbage collection of an object? A. Garbage collection cannot be forced. B. gc(). C. gc(), passing in a reference to the object to be garbage-collected. D. gc(). E. Set all references to the object to new values (null, for example).

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