Download Complete Java2 Certification Study Guide by Philip Heller PDF

By Philip Heller

Here's a revised and more desirable version of the main respected Java certification advisor, with in-depth assurance of the newest models of the Java Programmer and Developer assessments. Written via the folk who really created the tests for solar, this insider's consultant will arrange you to take those scorching checks with self assurance. Sybex examine courses are choked with unheard of research tools--hundreds of not easy overview questions and digital flashcards that support make stronger key themes, and real-world eventualities that supply views and insights from pro execs. The CD contains a complicated checking out engine with 1000's of pattern examination questions and the whole publication in PDF.

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String Literals A string literal is a sequence of characters enclosed in double quotes. ”; Java provides many advanced facilities for specifying non-literal string values, including a concatenation operator and some sophisticated constructors for the String class. ” Arrays A Java array is an ordered collection of primitives, object references, or other arrays. Java arrays are homogeneous: except as allowed by polymorphism, all elements of an array must be of the same type. That is, when you create an array, you specify the element type, and the resulting array can contain only elements that are instances of that class or subclasses of that class.

The general answer to this question is that they belong in the most appropriate class or interface. Unfortunately, “most appropriate” doesn’t always mean most convenient. Suppose you put our two lines in a class called Scales. Since the constants are in the namespace of Scales, they may appear there without prefix. For example, Scales might contain massInPounds = massInKgs * LBS_PER_KG; However, other classes must go to more trouble. LBS_PER_KG; Many programmers, wishing to avoid the inconvenience of prefixing, have discovered the trick of creating an interface (known as a constant interface) to contain constants.

DateFormat C. TimeFormat D. DateFormat 24. The following line of code is valid. int x = 9; byte b = x; A. True B. False xxix xxx Assessment Test 25. Which of the following code snippets compile? A. Integer i = 7; B. Integer i = new Integer(5); int j = i; C. byte b = 7; D. int i = 7; byte b = i; E. None of the above 26. What will be the output of the following code? println("different"); } } } A. The code will compile but not run. B. The code will not compile. C. “different” will be printed out to the console.

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