By J. Juneau, et. al.,
Java EE 7 Recipes takes an example-based technique in exhibiting find out how to application company Java functions in lots of diverse eventualities. Be it a small-business internet program, or an firm database software, Java EE 7 Recipes presents potent and confirmed recommendations to complete with reference to any job that you could be come across. you could suppose convinced utilizing the trustworthy recommendations which are confirmed during this ebook on your own or company surroundings.
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Extra info for Java 7 Recipes - A Problem-Solution Appr.
Sample text
Straightforward and easy to use, these comparison operators are most often seen within the context of an if statement. 3-4. Comparing Floating-Point Numbers Problem You need to compare two or more floating-point values in an application. Solution #1 Use the Float object’s compareTo() method to perform a comparison of one Float against another. compareTo(float2)); // // // // Result: Result: Result: Result: -1 -1 0 1 The result of calling the compareTo() method is an Integer value. A negative result indicates that the first float is less than the float that it is being compared against.
The mathematical methods include those that are useful for performing everyday mathematics, as well as those that are useful for working with the numbers in a trigonometric methodology. A summary of the standard mathematical methods can be seen in Table 3-3. 51 ■ CHAPTER 3 ■ NUMBERS AND DATES Table 3-3. Complex Class Standard Mathematics Methods Method Description abs() Returns the absolute value of the complex number add(Complex num) divide(Complex num) Returns the sum of two complex numbers Returns the quotient of two complex numbers Returns the exponential function exp() multiply(Complex num) multiply(double num) Returns the product of two complex numbers Returns the product of the complex number and a given double Returns the additive inverse of the complex number negate() nthRoot(int num) pow(Complex num) Computes and returns the nth roots Returns the complex number raised to the power of num Returns the square root sqrt() subtract(Complex num) Returns the difference between two complex numbers To make use of these methods, you call them against any given complex number object.
The StringBuffer class contains a number of helper methods for building and manipulating character sequences. In the solution, the append() method is used to append two String values. The append() method places the String that is passed as an argument at the end of the StringBuffer. html. 2-6. Converting Strings to Numeric Values Problem You would like to have the ability to convert any numeric values that are stored as Strings into Integers. valueOf() helper method to convert Strings to int data types.