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ruby hosting ruby hosting In that case, the program will compile just fine, but will generate a NullPointerException at runtime. Question 2: The following code creates one Point object and one Rectangle object. How many references to those objects exist after the code executes? Is either object eligible for garbage collection? ...

ruby hosting Point point = new Point(2,4); Rectangle rectangle = new Rectangle(point, 20, 20); point = null; ... Answer 2: There is one reference to the Point object and one to the Rectangle object. Neither object is eligible for garbage collection.

ruby hosting Question: How does a program destroy an object that it creates? Answer: A program does not explicitly destroy objects. A program can set all references to an object to null so that it becomes eligible for garbage collection. But the program does not actually destroy objects. Exercises Exercise 1: Fix the program called SomethingIsWrong shown in Question 1. Answer 1: See SomethingIsRight public class SomethingIsRight } Exercise 2: Given the following class, called NumberHolder, write some code that creates an instance of the class, initializes its two member variables, and then displays the value of each member variable.

ruby hosting public class NumberHolder Answer 2: See NumberHolderDisplay public class NumberHolderDisplay } « Previous • TOC Problems with the examples? Try Compiling and Running the Examples: FAQs. Complaints? Compliments? Suggestions? Give us your feedback. Copyright 1995-2007 Sun Microsystems, Inc. All rights reserved. Previous page: Questions and Exercises: Objects Questions and Exercises: Objects (The Java™ Tutorials > Learning the Java Language > Classes and Objects) .

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