By Michael Sikora
Solar Microsystems estimates the dimensions of the Java developer marketplace to be 2.5 million and rising). As advertisement companies movement over from shopper server structures to constructing multi-tiered web-based platforms, this viewers will keep growing. This e-book is exclusive in that it covers loads of floor in a small variety of pages, utilizing examples and targeted guideline to educate techniques. it truly is aimed toward the reader who has event programming in one other language and is attracted to switching to Java. this can be additionally an ideal complement for classes in a variety in the CS curriculum and a couple of teachers surveyed have expressed enthusiasm for this actual ebook as a way to get all in their scholars up-to-speed quick on Java.
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Extra resources for Java: Practical Guide for Programmers
Operands with a higher precedence are applied before those of a lower precedence. The operands *, /, and % are of equal precedence, and are of higher precedence than + and -. Consequently, 8 * 4 - 2 is equivalent to (8 * 4) - 2, which equals 30 8 + 4 / 2 is equivalent to 8 + (4 / 2), which equals 10 Of course, you can use parentheses to override this default behavior. Thus, 8 * (4 - 2) will evaluate to 16 (8 + 4) / 2 will evaluate to 6 Where an expression consists of two or more operators of equal precedence, Java will in general evaluate the operands from left to right.
An example of string literals is the statement in lines 16–17 of the Circle program. We can define a string to be a variable by using the String data type. println(string1 + args + string2 + area); The + is used as a concatenation operator. Where a String is concatenated with a value that is not a String, such as args or area, the compiler will convert that value to a String. A String is actually an object in Java; we discuss objects in detail in Chapter 4. A string can be created using the following objectlike syntax: String string1 = new String("A circle of radius "); This statement, and the statement String string1 = "A circle of radius "; are both legal in Java.
However, the statement s = i; is illegal because there is possible loss of precision. The program will fail to compile. In this case, we need to explicitly cast the data type. This is done by enclosing the target data type with parentheses and prefixing this to the source variable. 2f; int i = (int) fvar; Note this truncates the fractional part. Even with a cast we cannot assign a boolean to an integer or real. chapter 3 Flow Control This chapter concludes the basic language syntax with a discussion of sequencing, branching, and looping.
Java: Practical Guide for Programmers by Michael Sikora