Questions and Exercises: Objects in Java

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Questions and Exercises: Objects
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Some of the following questions and exercises refer to the Point and Rectangle classes Use the classes shown on page 123 and page 124, respectively
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Questions
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What's wrong with the following program
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public class SomethingIsWrong { public static void main(String[] args) { Rectangle Table of Contents myRect; myRectwidth = 40; Java Tutorial, Third Edition: A Short Course on myRectheight = 50; Systemoutprintln("myRect's area is " + myRectarea()); the Basics, The } ByMary Campione,Kathy Walrath,Alison Huml }
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Publisher Pub Date ISBN Pages
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The following code creates one Point object and one Rectangle object How many : December 28, 2000 references to those objects exist after the code executes Is either object eligible for : 0-201-70393-9 garbage collection
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: 592
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: Addison Wesley
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Point point = new Point(2,4); Rectangle rectangle = new Rectangle(point, 20, 20); "This book stands above the rest because it has been available on the web and read by thousands of point = null; Java programmers The authors have received an enormous amount of feedback about which sections
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are good and which sections are confusing; the confusing ones have been improved I doubt that any other Java book has undergone such trial by fire" -Metroplex Java User Group, 3: How does a program destroy an object that it creates wwwjavamugorg/reviews/
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Whether you're taking a class or learning on the job, The Java(TM) Tutorial, Third Edition , is a handsExercisesthat lets you quickly become proficient with the Java programming language Written by on guide members of the Java Software team at Sun Microsystems, the book uses an interactive approach to help you learn the Java platform by example
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1: Fix the program called 1995, the material in The Java(TM) Tutorial Since its first online release in SomethingIsWrong shown in question 1 has been updated continuously to reflect reader feedback and new releases of the Java platform This third edition has 2: Given the following class, write of the Java Platform, Standard Edition, as well as preceding been thoroughly updated to cover v13 some code that creates an instance of the class, initializes its two early as variables, versions as member JDK 11 and then displays the value of each member variable
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You will find clear explanations of such fundamentals as objects, classes, and data structures In public class NumberHolder { addition, the book provides introductions to object-oriented programming, applet construction, and public int anInt; user interface design Other topics include exceptions, I/O, and threads To help beginners avoid many public float aFloat; common mistakes, an entire chapter is devoted to programming problems and their solutions } Convenient summaries at the end of each section are new to this edition Also new for this edition are "Questions and Exercises" sections to help you practice what you learn
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Answers After working through the lessons in this proven tutorial, you will be well prepared to use the Java programming language in your school or workplace You can find answers to these Questions and Exercises online: http://javasuncom/docs/books/tutorial/java/data/QandE/objects-answershtml
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Characters and Strings
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The Java platform contains three classes that you can use when working with character data:
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Character[1] A class whose instances can hold a single character value This class also
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defines handy methods that can manipulate or inspect single-character data
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[1]http://javasuncom/j2se/13/docs/api/java/lang/Characterhtml
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String[2] A class for working with immutable (unchanging) data composed of multiple
characters
Table of Contents
Java Tutorial, Third Edition: A Short Course on the Basics, The A class for storing and manipulating mutable data composed of multiple StringBuffer[3]
[2]http://javasuncom/j2se/13/docs/api/java/lang/Stringhtml
ByMary Campione,Kathy Walrath,Alison Huml characters Publisher Pub Date ISBN Pages : Addison Wesley
[3]http://javasuncom/j2se/13/docs/api/java/lang/StringBufferhtml
: December 28, 2000 : 592
Characters: 0-201-70393-9
An object of Character type contains a single character value You use a Character object instead of a primitive char variable when an object is required for example, when passing a character value into a method that changes the value or when placing a character value into a data structure, such as "This book stands above the rest a vector, that requires objects because it has been available on the web and read by thousands of Java programmers The authors have received an enormous amount of feedback about which sections are good and which sections are confusing; the confusing ones have been improved I doubt that any other JavaThe following sample program, CharacterDemo,[4] creates a few character book has undergone such trial by fire" -Metroplex Java User Group, wwwjavamugorg/reviews/ objects and displays some information about them The code that is related to the Character class is shown in boldface: Whether you're taking a class or learning on the job, The Java(TM) Tutorial, Third Edition , is a hands[4]CharacterDemojava is included the Java programming language See on guide that lets you quickly become proficient with on the CD and is available online Written by members of theCode Samples (page at SunThis program requires Java 2 SDK 12 to runapproach to Java Software team 174) Microsystems, the book uses an interactive because it uses the example help you learn the Java platform by compareTo method, which was added to the Character class for that release Since its first online release in 1995, the material in The Java(TM) Tutorial has been updated public class reflect reader feedback and new releases of the Java platform This third edition has continuously to CharacterDemo { been public static void cover v13 of the Java Platform, Standard Edition, as well as preceding thoroughly updated to main(String args[]) { Character a = new Character('a'); versions as early as JDK 11
Character a2 = new Character('a');
Character b = new such fundamentals You will find clear explanations ofCharacter('b'); as objects, classes, and data structures In addition, the book provides introductions to object-oriented programming, applet construction, and int difference = acompareTo(b); user interface design Other topics include exceptions, I/O, and threads To help beginners avoid many common mistakes, an entire chapter { devoted to programming problems and their solutions if (difference == 0) is Convenient summaries at the end of each section are new to this edition Also new for this edition are Systemoutprintln("a is equal to b"); "Questions and Exercises" sections to help you practice what you learn } else if (difference < 0) { Systemoutprintln("a is less than b");
After working through the lessons in this 0) { tutorial, you will be well prepared to use the Java } else if (difference > proven programming language in your school or workplace Systemoutprintln("a is greater than b");
} Systemoutprintln("a is " + ((aequals(a2)) "equal" : "not equal") + " to a2"); Systemoutprintln("The character " + atoString() + " is " + (CharacterisUpperCase(acharValue()) "upper" : "lower") + "case");
The following is the output from this program: