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to be either type float or type double. So it coerces the 22 into being 22.0 and then performs the operation. JAVADOC A Java program is a main class together with the other classes that it uses. Most classes are part of the standard Java Class Libraries provided by Sun Microsystems, Inc. These libraries are orgainzed into several package hierarchies, known collectively as the Application Programming Interface (API). The two most common package hierarchies are the java and javax hierarchies, parts of which are shown in Figure 1.8.
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Figure 1.8 Parts of the java and javax package hierarchies
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Complete documentation is provided for all the classes in the Java API. Also called Java API Specification, these javadocs are located at:
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http://java.sun.com/javase/6/docs/api/
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The Javadoc for the String class, in the java.lang package, is shown in Figure 1.9 on page 17. Review Questions
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1.1 1.2 What is a requirements document What is the difference between the design stage and the implementation stage in the development of software
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Figure 1.9 Javadoc for the java.lang.String class
1.3 1.4 1.5 1.6 1.7 1.8 1.9
What is the difference between the state and the behavior of a class What is an abstract data type What constitutes a Java program What kinds of members can a class have What is an implicit argument What is the purpose of the toString() method What is the purpose of the equals() method
1.10 What's the difference among public, protected, and private 1.11 What is a package 1.12 What is the difference between an abstract class and an abstract data type
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1.13 What is the difference between a constructor and a method 1.14 What is the difference between a class method and an instance method 1.15 What is the difference between equality of objects and equality of the references that refer to them 1.16 Explain the difference between the output from
String s; System.out.println("s = " + s);
and the output from
String s = new String(); System.out.println("s = " + s);
1.17 What is the purpose of declaring a field private and declaring a mutator method that allows the public to change it. Wouldn t it be just as good to just make it public 1.18 What is an enum type 1.19 What is the difference between composition and aggregation 1.20 What is polymorphism
Problems
1.1 Translate this ADT into a Java interface:
ADT: Point amplitude(): Real distanceTo(Point): Real equals(Point): Boolean magnitude(): Real toString(): String xCoordinate(): Real yCoordinate(): Real
Translate this ADT into a Java interface:
ADT: Line contains(Point): Boolean equals(Line): Boolean isHorizontal(): Boolean isVertical(): Boolean slope(): Real toString(): String xIntercept(): Real yIntercept(): Real
Translate this ADT into a Java interface:
ADT: Circle area(): Real center(): Point circumference(): Real contains(Point): Boolean equals(Circle): Boolean radius(): Real toString(): String
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Translate this ADT into a Java interface:
ADT: Polynomial degree(): int derivative(): Polynomial equals(Point): Boolean sum(Polynomial): Polynomial toString(): String valueAt(Real): Real
1.5 1.6 1.7 1.8
Implement the ADT in Problem 1.1 with a Java class, and draw its UML diagram. Implement the ADT in Problem 1.2 with a Java class, and draw its UML diagram. Implement the ADT in Problem 1.3 with a Java class, and draw its UML diagram. Implement the ADT in Problem 1.4 with a Java class, and draw its UML diagram.
Answers to Review Questions
1.1 1.2 The requirements document of a software development project is a precise specification of what the software should do. In the development of software, the design stage identifies the components (classes) to be used and the relationships among them. The implementation stage is where the computer progam code is actually written. The state of a class consists of the values of its fields. The behavior of a class is defined by its methods. An abstract data type is a specification of the type s operations: what an instance of that type can do. A Java program is a Java class with a main() method The main() method must have this header:
public static void main(String[] args)
1.3 1.4 1.5 1.6 1.7 1.8 1.9 1.10
A class member may be a field, a constructor, a method, a nested class, a nested interface, or an enum type. The implicit argument of a method is the object to which the method invocation is bound. The toString() method returns a String object that represents the state of its implicit argument. The equals() method returns true if and only if states (contents) of its implicit and explicit arguments are the same. A class member that is declared public is accessible from any other class. A class member that is declared protected is accessible only from its own class and subclasses (extensions). A class member that is declared private is accessible only from its own class. A package is a namespace, that is, a name for a group of classes, interfaces, and enum types that can be used to distinguish those from other classes, interfaces, and enum types with the same name. An abstract class is a Java class with at least one abstract method a method that has no body. An abstract data type is a specification of a type s operations that could be implemented in any object-oriented programming language. A constructor is a member function of a class that is used to create objects of that class. It has the same name as the class itself, has no return type, and is invoked using the new operator. A method is an ordinary member function of a class. It has its own name, a return type (which may be void), and is invoked using the dot operator. A class method is declared static and is invoked using the class name. For example,
double y = Math.abs(x);
1.11 1.12
invokes the class method abs() that is defined in the Math class. An instance method is declared without the static modifier and is invoked using the name of the object to which it is bound. For example,
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