Download Complete Java 2 Certification Study Guide (3rd Edition) by Philip Heller PDF

By Philip Heller

Are looking to overcome of the main tricky programmer certifications? the hot version of the best-selling whole Java 2 Certification examine advisor is the source you would like. Authors Philip Heller and Simon Roberts, builders of Sun's Programmer and Developer tests for the Java 2 Platform, provide you with every thing you want to move the assessments the 1st time. This totally revised variation is up to date for the adjustments in either checks, together with insurance of latest ambitions for J2SE 1.4, a brand new emphasis on Swing and RMI, and data for tackling the recent structure of the Developer examination. The ebook can also be more desirable with all-new gains from Sybex's market-leading examine publications, together with examination crucial sections to augment key topic parts and real-world situation sidebars with pattern programming assignments. The significant other CD comprises all of the evaluation questions from the e-book, a convention programmer's examination, and a hundred and fifty random-test questions, together with a hundred new questions. The CD additionally features a absolutely searchable digital variation of the ebook.

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Extra info for Complete Java 2 Certification Study Guide (3rd Edition)

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Line 2 demonstrates that an automatic variable may be initialized in its declaration line. Initialization on a separate line is also possible. Argument Passing W hen Java passes an argument into a method call, a copy of the argument is actually passed. Consider the following code fragment: 1. 2345; 2. println(“Sine of “ + radians + 3. 2345. On line 2, a copy of this bit pattern is passed into the method-calling apparatus of the Java Virtual Machine (JVM). When an argument is passed into a method, changes to the argument value by the method do not affect the original data.

And 1. public Object myMethod(Object x) { 2. (x instanceof String)) { 3. toString(); 4. } 5. return x; 6. } In the first fragment, a test is made at line 2, but the conversion and assignment, at line 6, occurs only if the test failed. This is achieved by the somewhat cumbersome technique of using only the else part of an if/else construction. ” Because of this change to the test, the conversion can be performed at line 3 in the situation that the test has succeeded; no else part is required, and the resulting code is cleaner and shorter.

If overflow or underflow occurs during numeric addition or subtraction, then meaning is lost but no exception occurs. ” Most of the new understanding to be gained about the + operator relates to its role in concatenating text. com The Arithmetic Operators 43 Where either of the operands of a + expression is a String object, the meaning of the operator is changed from numeric addition to concatenation of text. In order to achieve this result, both operands must be handled as text. If both operands are in fact String objects, this is simple.

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