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System.err.println( "I/O error: " + e.getMessage() ); } } } SUMMARY Java is a modern object-oriented programming language. This chapter discussed how to compile and run Java programs. We discussed the primitive data types in Java, as well as the frequently used reference types including String and Array types. We explained the use of control structures for selective code execution and iteration. These statements included the if-else, for, while, do-while, and switch statements. Java takes advantage of the OO concept of classes, and the attendant principles of inheritance, encapsulation, and polymorphism. An instance of a class is called an object, and objects have state and behavior. Classes define both instance and static variables, which manifest the state of an object. Classes also define both instance and static methods, which endow objects with their characteristic behaviors. Java also provides the concept of an interface, which makes it possible to enforce similar behavior across different classes. Error handling in Java is accomplished using Exception objects. When an error occurs, a program can throw an Exception, which can describe the problem. Exceptions can be caught within the application when the code generating the Exception is enclosed in a try block. Following the try block can be multiple catch blocks and a finally block. Catch blocks can specify which subclasses of Exception they will handle. Code in a finally block will always be executed, whether an error occurs in the try block or not. If the application does not catch an Exception, the Exception will propagate up to the JVM, which will handle the Exception by reporting it and terminating the program. Input and output in Java occurs using streams. A stream is a sequence of data elements. The many types of streams available in Java can be classified into Input/OutputStreams, which handle raw binary data as bytes, and Reader / Writer streams which handle character data, and automatically perform translations to and from character encodings. For efficiency, good programming practice is to wrap a base stream object in a buffered stream to provide efficient buffering of I/O. The Scanner class in Java is a handy class for reading text from the keyboard, a file, or other input stream. The PrintWriter class is another convenience class that facilitates the common task of writing formatted text to a file. REVIEW QUESTIONS 5.1 Write a Java program that divides the number 74.3 by 12.6 and reports the result of the division. Store the dividend and divisor in variables named dividend and divisor before performing the division. What will be the type of these variables What will be the type of the result What is the quotient 5.2 Write a Java program to compute the area of a circle whose radius is 5. For the value of PI, use 3.14. Now rewrite your program so that it uses the very precise value of PI available as a static constant in the Math class that comes with Java. Here is how you use the Math class constant: double pi = Math.PI; How much does your result change 5.3 Write a Java program that prompts the user for a number, and then tells the user whether the number is an even multiple of 5. Use Scanner to read the number from the user, and use the modulo operator (%) to decide whether the number is a multiple of 5. 5.4 Write a Java program that asks a user to enter five Strings, one at a time. Have it save the Strings in an array of strings. Then have the program display the words in reverse order. Use a for, or a while, or a do while loop to read in the Strings, and another for, while, or do while loop to print them out. 5.5 Write a Java program that can categorize vehicles based on the number of wheels the vehicle has. Your program should prompt the user for the number of wheels on the vehicle, and then read the number into an int variable. If the user says the vehicle has 2 or 3 wheels, the program will report that it is a
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