Programmer's Guide to Java Certification

Exam Objectives Write code using the following methods of the java.lang.Math class: abs(), ceil(), floor(), max(), min(), random(), round(), sin(), cos(), tan(), sqrt().Describe the significance of...

Overview of the java.lang Package The java.lang package is indispensable when programming in Java. It is automatically imported into every source file at compile time. The...

The Object Class All classes extend the Object class, either directly or indirectly. A class declaration, without the extends clause, implicitly extends the Object class (see...

10.1 What is the return type of the hashCode() method in the Object class? Select the one correct answer. StringintlongObjectClass10.2 Which statement is true? Select the one correct answer. If the...

Wrapper classes were introduced with the discussion of the primitive data types (see Section 2.2, p. 28). Primitive values in Java are not objects. In...

Review Questions 10.4 Which of the following are wrapper classes? Select the three correct answers. java.lang.Voidjava.lang.Intjava.lang.Booleanjava.lang.Longjava.lang.String10.5 Which of the following classes do not extend the java.lang.Number class? Select the two correct...

The Math Class The final class Math defines a set of static methods to support common mathematical functions, including functions for rounding numbers, performing trigonometry, generating...

Review Questions 10.10 Given the following program, which lines will print 11 exactly? class MyClass { public static void main(String[] args) {...

The String Class Handling character strings is supported through two final classes: String and StringBuffer. The String class implements immutable character strings, which are read-only once...

10.16 Which of the following operators cannot be used in conjunction with a String object? Select the two correct answers. +-+=.&10.17 Which expression will extract the substring "kap" from...

The StringBuffer Class In contrast to the String class, which implements immutable character strings, the StringBuffer class implements mutable character strings. Not only can the character...

10.28 What will be the result of attempting to compile and run the following program? public class MyClass { public static void main(String[] args)...

Chapter Summary The following information was included in this chapter: discussion of the Object class, which is the most fundamental class in Javadiscussion of the wrapper classes,...

10.1 Create a class named Pair, which aggregates two arbitrary objects. Implement the equals() and hashCode() methods in such a way that a Pair object is...