By Jay Bryant
Java 7 Programming for Absolute Beginners introduces the hot center, open resource Java improvement package. Its concentration is on useful wisdom and its completeness—it offers the entire bits and items an utter beginner must start programming in Java.
it kind of feels as though everyone seems to be writing functions or apps nowadays for Android, BlackBerry, and the enterprise—it's the place the money's at. yet, how do they do it? good, it is best to begin by means of studying Java, some of the most renowned programming languages round nowadays, nonetheless. certain, that is correct.
- Teaches Java improvement in language an individual can comprehend, providing you with the very best commence
- Provides uncomplicated, step by step examples that make studying effortless, permitting you to choose up the thoughts with out fuss
- Offers transparent code descriptions and format so you might get your code operating once attainable
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Additional resources for Java 7 for Absolute Beginners
Table 3-1 shows the details of the various integer primitives. J. Bryant, Java 7 for Absolute Beginners © Jay Bryant 2012 35 CHAPTER 3 ■ DATA TYPES Table 3-1. Integer primitives Type Bits Minimum Value Maximum Value byte 8 -128 127 short 16 -32768 32767 int 32 -2,147,483,648 2,147,483,647 long 64 -9,223,372,036,854,775,808 9,223,372,036,854,775,807 Do you need even bigger numbers? Real-world applications sometimes need numbers even bigger than the maximum value of long. In those cases, Java provides a class called BigInteger.
Eclipse runs a compiler for us and checks our code as we type it, so we 29 CHAPTER 2 ■ JAVA SYNTAX know immediately when we need to catch checked exceptions. Runtime exceptions (as the name implies) can only be caught at run time, so Eclipse can't warn us about those as we write our code. Checked exceptions represent things beyond the program's control, such as bad user input or a file not existing. Runtime exceptions represent things that can be fixed with more or better code. One school of thought says that checked exceptions represent things the program should recover from.
Sometimes, the name is meaningful and tells us something about the parent. Sometimes, as here, the name of the parent class doesn't tell us much (because every class ultimately extends Object). Good software developers strive for meaningful names, but it's not always possible. The sixth word, implements, tells us that this class uses one or more interfaces. We visit them later in this chapter. The seventh (and last, in this example) word, Average, tells us the name of the interface this class implements.
Java 7 for Absolute Beginners by Jay Bryant