Java The Complete Reference, Seventh Edition

This is fileProtection.java: package p1; public class Protection { int n = 1; private int n_pri = 2; protected int n_pro = 3; pu ...

Chapter 9: Packages and Interfaces 189 Following is the source code for the other package,p2. The two classes defined inp2 cover ...

If you wish to try these two packages, here are two test files you can use. The one for packagep1is shown here: // Demo package ...

Chapter 9: Packages and Interfaces 191 either an explicitclassnameor a star (*), which indicates that the Java compiler should i ...

192 Part I: The Java Language String name; double bal; public Balance(String n, double b) { name = n; bal = b; } public void sho ...

Chapter 9: Packages and Interfaces 193 Interfaces are designed to support dynamic method resolution at run time. Normally, in or ...

194 Part I: The Java Language Implementing Interfaces Once aninterfacehas been defined, one or more classes can implement that i ...

Chapter 9: Packages and Interfaces 195 Accessing Implementations Through Interface References You can declare variables as objec ...

196 Part I: The Java Language Now, try the following class: class TestIface2 { public static void main(String args[]) { Callback ...

Chapter 9: Packages and Interfaces 197 // this is a nested interface public interface NestedIF { boolean isNotNegative(int x); } ...

The following program creates a class calledFixedStackthat implements a fixed-length version of an integer stack: // An implemen ...

Chapter 9: Packages and Interfaces 199 Following is another implementation ofIntStackthat creates a dynamic stack by use of the ...

200 Part I: The Java Language for(int i=0; i<20; i++) System.out.println(mystack2.pop()); } } The following class uses both t ...

Chapter 9: Packages and Interfaces 201 It is as if that class were importing the constant fields into the class name space asfin ...

202 Part I: The Java Language public static void main(String args[]) { Question q = new Question(); answer(q.ask()); answer(q.as ...

System.out.println("Implement meth3()."); } } class IFExtend { public static void main(String arg[]) { MyClass ob = new MyClass( ...

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10 Exception Handling 10 Exception Handling T his chapter examines Java’s exception-handling mechanism. Anexceptionis an abnorma ...

206 Part I: The Java Language catch (ExceptionType1 exOb) { // exception handler forExceptionType1 } catch (ExceptionType2 exOb) ...

stop, because once an exception has been thrown, it must becaughtby an exception handler and dealt with immediately. In this exa ...