Complete Java 2 Certification Study Guide, 4th Edition by Philip Heller

By Philip Heller

This is the booklet you want to arrange for the Java 2 Programmer's and Developer's assessments. This research advisor presents: * In-depth assurance of each examination target for the Programmer's examination for J2SE 1.4 * countless numbers of difficult perform questions * modern examination instruction software program, together with a try out engine, pattern simulation questions, and the complete publication on PDF Authoritative insurance of all Programmer's examination targets, together with: * Language basics * Operators and assignments * Modifiers * changing and casting * circulation keep watch over, exceptions, and assertions * items and periods * Threads * The java.lang and java.util programs In-depth insurance of the themes coated within the Developer's examination, together with: * Swing parts and occasions * format managers * bettering and lengthening the database * Writing the community protocol * construction the database server * Connecting the buyer and server

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Sample text

Know how to declare and construct arrays. The declaration includes one empty pair of square brackets for each dimension of the array. The square brackets can appear before or after the array name. Arrays are constructed with the keyword new. Know the default initialization values for all possible types of class variables and array elements. Know when data is initialized. Initialization takes place when a class or array is constructed. The initialization values are 0 for numeric type arrays, false for boolean arrays, and null for object reference type arrays.

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; } } 25 26 1 Language Fundamentals 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).

This means that you cannot reliably calculate the amount of memory consumed by adding up data sizes. The exam is careful to avoid potentially ambiguous questions and asks about variables only from the Java language perspective, not the underlying implementation. 3. Notice that for each type, the exponent of 2 in the minimum and maximum is one less than the size of the type. Two’s-complement is a way of representing signed integers that was originally developed for microprocessors in such a way as to have a single binary representation for the number 0.

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