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Consider a Stack class that contains a member variable referring to a Vector If Stack relies on Object's implementation of clone, the original stack and its clone refer to the same vector Changing one stack changes the other, which is undesirable behavior Here is an appropriate implementation of clone for our Stack class, which clones the vector to ensure that the original stack and its clone do not refer to the same vector:
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public class Stack implements Cloneable { private Vector items; // code for Stack's methods and constructor not shown protected Object clone() { try { Stack s = (Stack)superclone(); // clone the stack sitems = (Vector)itemsclone();// clone the vector Table of Contents return s; // return the clone Java }Tutorial, Third Edition: A Shorte) { catch (CloneNotSupportedException Course on //This the Basics, The shouldn't happen because //Stack and Vector are Cloneable ByMary Campione,Kathy Walrath,Alison Huml throw new InternalError(); }: Addison Wesley Publisher } Pub Date : December 28, 2000 }
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ISBN : 0-201-70393-9 Pages : 592 The implementation for Stack'sclone method is relatively simple First, it calls Object's
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implementation of the clone method by calling superclone, which creates and initializes a Stack object At this point, the original stack and its clone refer to the same vector Next, the method clones the vector "This book stands above the rest 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 Java book has undergone such trial by fire" -Metroplex Java User Group, Be Careful wwwjavamugorg/reviews/ Theclone method should never use new to create the clone and should not call Whether you're taking a class or learning on the job, The Java(TM) Tutorial, Third Edition , is a handsconstructors Instead, the method should call superclone, which creates an object of the on guide that lets you quickly become proficient with the Java programming language Written by correct type and allows the hierarchy of superclasses to perform the copying necessary to members of the Java Software team at Sun Microsystems, the book uses an interactive approach to get a proper clone help you learn the Java platform by example
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Since its first online release in 1995, the material in The Java(TM) Tutorial has been updated continuously to reflect reader feedback and new releases of the Java platform This third edition has The equals and hashCode Methods v13 of the Java Platform, Standard Edition, as well as preceding been thoroughly updated to cover versions as early as JDK 11 Theequals method compares two objects for equality and returns true if they are equal The You will method provided in the Object class uses the objects, classes, ==) to determine whether equals find clear explanations of such fundamentals asidentity operator (and data structures In addition, the book provides introductions to object-oriented programming, the method returns and two objects are equal If the objects compared are the exact same object, applet construction, true user interface design Other topics include exceptions, I/O, and threads To help beginners avoid many common for some classes, chapter is objects to programming problems and their solutions However,mistakes, an entiretwo distinctdevoted of that type might be considered equal if they contain the same information Consider this code that tests two Integers,one and anotherOne, for equality: 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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Integer one = new Integer(1), anotherOne = new Integer(1); After working through the lessons in this proven tutorial, you will be well prepared to use the Java if (oneequals(anotherOne)) { programming language in your school or workplace Systemoutprintln("objects are equal"); }
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This program displays objects are equal even though one and anotherOne reference two distinct objects They are considered equal because the objects compared contain the same integer value You should override the equals method only if the identity operator is not appropriate for your class If you override equals, override hashCode as well
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The value returned by hashCode is an int that maps an object into a bucket in a hash table An object must always produce the same hash code However, objects can share hash codes (they aren't necessarily unique) Writing a "correct" hashing function is easy always return the same hash code for the same object Writing an "efficient" hashing function one that provides a sufficient distribution of objects over the buckets is difficult and is outside the scope of this book Even so, the hashing function for some classes is relatively obvious For example, an obvious hash code for an Integer object is its integer value For an example of a class that overrides the equals andhashCode methods, see the BingoBall class in BINGO! [1]
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