free visual basic barcode generator The Java Language in Java

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The Java Language
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This is file Protectionjava:
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package p1; public class Protection { int n = 1; private int n_pri = 2; protected int n_pro = 3; public int n_pub = 4; public Protection() { Systemoutprintln("base constructor"); Systemoutprintln("n = " + n); Systemoutprintln("n_pri = " + n_pri); Systemoutprintln("n_pro = " + n_pro); Systemoutprintln("n_pub = " + n_pub); } }
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This is file Derivedjava:
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package p1; class Derived extends Protection { Derived() { Systemoutprintln("derived constructor"); Systemoutprintln("n = " + n); // // class only Systemoutprintln("n_pri = "4 + n_pri); Systemoutprintln("n_pro = " + n_pro); Systemoutprintln("n_pub = " + n_pub); } }
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This is file SamePackagejava:
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package p1; class SamePackage { SamePackage() { Protection p = new Protection(); Systemoutprintln("same package constructor"); Systemoutprintln("n = " + pn); // // class only Systemoutprintln("n_pri = " + pn_pri); Systemoutprintln("n_pro = " + pn_pro); Systemoutprintln("n_pub = " + pn_pub); } }
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Packages and Interfaces
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Following is the source code for the other package, p2 The two classes defined in p2 cover the other two conditions that are affected by access control The first class, Protection2, is a subclass of p1Protection This grants access to all of p1Protection s variables except for n_pri (because it is private) and n, the variable declared with the default protection Remember, the default only allows access from within the class or the package, not extra-package subclasses Finally, the class OtherPackage has access to only one variable, n_pub, which was declared public This is file Protection2java:
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package p2; class Protection2 extends p1Protection { Protection2() { Systemoutprintln("derived other package constructor"); // // // // class or package only Systemoutprintln("n = " + n); class only Systemoutprintln("n_pri = " + n_pri); Systemoutprintln("n_pro = " + n_pro); Systemoutprintln("n_pub = " + n_pub); } }
This is file OtherPackagejava:
package p2; class OtherPackage { OtherPackage() { p1Protection p = new p1Protection(); Systemoutprintln("other package constructor"); // // // // // // class or package only Systemoutprintln("n = " + pn); class only Systemoutprintln("n_pri = " + pn_pri); class, subclass or package only Systemoutprintln("n_pro = " + pn_pro); Systemoutprintln("n_pub = " + pn_pub); } }
Part I:
The Java Language
If you wish to try these two packages, here are two test files you can use The one for package p1 is shown here:
// Demo package p1 package p1; // Instantiate the various classes in p1 public class Demo { public static void main(String args[]) { Protection ob1 = new Protection(); Derived ob2 = new Derived(); SamePackage ob3 = new SamePackage(); } }
The test file for p2 is shown next:
// Demo package p2 package p2; // Instantiate the various classes in p2 public class Demo { public static void main(String args[]) { Protection2 ob1 = new Protection2(); OtherPackage ob2 = new OtherPackage(); } }
Importing Packages
Given that packages exist and are a good mechanism for compartmentalizing diverse classes from each other, it is easy to see why all of the built-in Java classes are stored in packages There are no core Java classes in the unnamed default package; all of the standard classes are stored in some named package Since classes within packages must be fully qualified with their package name or names, it could become tedious to type in the long dot-separated package path name for every class you want to use For this reason, Java includes the import statement to bring certain classes, or entire packages, into visibility Once imported, a class can be referred to directly, using only its name The import statement is a convenience to the programmer and is not technically needed to write a complete Java program If you are going to refer to a few dozen classes in your application, however, the import statement will save a lot of typing In a Java source file, import statements occur immediately following the package statement (if it exists) and before any class definitions This is the general form of the import statement: import pkg1[pkg2](classname|*); Here, pkg1 is the name of a top-level package, and pkg2 is the name of a subordinate package inside the outer package separated by a dot () There is no practical limit on the depth of a package hierarchy, except that imposed by the file system Finally, you specify
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