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As the Math class relates to the certification exam, you won t be expected to reproduce complicated mathematical algorithms in your head or know the cosine of an angle. But remember that you will need to know how to calculate the result of calling abs(), ceil(), floor(), max(), min(), and round() with
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6: Java.lang The Math Class, Strings, and Wrappers
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any given values. Know the method signatures in Table 6-1. The exam will test your ability to remember method signatures and follow simple algorithms. Most questions on the Math class are quite simple as long as you ve spent the time to commit to memory the Math class methods and their calling signatures. Table 6-1 will really help. While you re at it, spend some time studying Table 6-1. It s important to know which methods are overridden and which are not. And just in case we re not making ourselves clear, we really want you to study Table 6-1.
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Remember that wrappers have two main functions: to wrap primitives so they can be treated like objects, and to provide utility methods for primitives (typically conversions). All the wrapper classes have the same name, capitalized, as their primitive counterparts except for Character and Integer. Remember that Boolean objects can t be used like boolean primitives. In terms of return on investment for your studying time, make sure that you know the details of the xxxValue() methods, the parseXxx() methods, the valueOf() methods, and the toString() methods. Pay attention to which methods are static and which throw NumberFormatException. Study Table 6-3. Copy it by hand, and then place it under your pillow. Frame it and hang it on your wall.
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Compare primitives with ==. To determine if two reference variables refer to the same object, use ==. To determine if two objects are meaningfully equivalent, use equals(). When using == to compare reference variables, the compiler will verify that the classes are the same or in the same inheritance hierarchy. Remember that the StringBuffer class does not override the equals() method, which means that there is no built-in method to determine if the contents of one StringBuffer object are the same as the contents of another StringBuffer object.
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Here are some of the key points from the certification objectives in this chapter.
Using the java.lang.String Class (Exam Objective 8.2) String objects are immutable, and String reference variables are not. If you create a new String without assigning it, it will be lost to your
program.
If you redirect a String reference to a new String, the old String can be lost. String methods use zero-based indexes, except for the second argument of
substring().
The String class is final its methods can t be overridden. When a String literal is encountered by the VM, it is added to the pool. Strings have a method named length(), arrays have an attribute named
length.
StringBuffers are mutable they can change without creating a new object. StringBuffer methods act on the invoking object, but objects can change
without an explicit assignment in the statement.
StringBuffer equals() is not overridden; it doesn t compare values. In all sections, remember that chained methods are evaluated from left to right. Using the java.lang.Math Class (Exam Objective 8.1) The abs() method is overloaded to take an int, a long, a float, or a double. The abs() method can return a negative if the argument is the minimum
int or long value equal to the value of Integer.MIN_VALUE or Long.MIN_VALUE, respectively.
The max() method is overloaded to take int, long, float, or double arguments. The min() method is overloaded to take int, long, float, or double arguments. The random() method returns a double greater than or equal to 0.0 and
less than 1.0.
6: Java.lang The Math Class, Strings, and Wrappers
The random() does not take any arguments. The methods ceil(), floor(), and round() all return integer
equivalent floating-point numbers, ceil() and floor() return doubles, round() returns a float if it was passed an int, or it returns a double if it was passed a long.
The round() method is overloaded to take a float or a double. The methods sin(), cos(), and tan() take a double angle in radians. The method sqrt() can return NaN if the argument is NaN or less
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