Java Tutorials
JAVA Tutorial PDF: Basics PDF for Beginners (Download Now)
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PACKAGE in Java is a collection of classes, sub-packages, and interfaces. It helps organize your classes into a folder structure and make it easy to locate and use them. More importantly, it helps improve code reusability.
Each package in Java has its unique name and organizes its classes and interfaces into a separate namespace, or name group.
Although interfaces and classes with the same name cannot appear in the same package, they can appear in different packages. This is possible by assigning a separate namespace to each Java package.
Syntax:-
package nameOfPackage;
The following video takes you through the steps of creating a package.
Click here if the video is not accessible
Let's study package with an example. We define a class and object and later compile this it in our package p1. After compilation, we execute the code as a java package.
Creating a package is a simple task as follows
Step 1) Consider the following package program in Java:
package p1; class c1(){ public void m1(){ System.out.println("m1 of c1"); } public static void main(string args[]){ c1 obj = new c1(); obj.m1(); } }
Here,
Step 2) In next step, save this file as demo.java
Step 3) In this step, we compile the file.
The compilation is completed. A class file c1 is created. However, no package is created? Next step has the solution
Step 4) Now we have to create a package, use the command
javac –d . demo.java
This command forces the compiler to create a package.
The "." operator represents the current working directory.
Step 5) When you execute the code, it creates a package p1. When you open the java package p1 inside you will see the c1.class file.
Step 6) Compile the same file using the following code
javac –d .. demo.java
Here ".." indicates the parent directory. In our case file will be saved in parent directory which is C Drive
File saved in parent directory when above code is executed.
Step 7) Now let's say you want to create a sub package p2 within our existing java package p1. Then we will modify our code as
package p1.p2; class c1{ public void m1() { System.out.println("m1 of c1"); } }
Step 8) Compile the file
As seen in below screenshot, it creates a sub-package p2 having class c1 inside the package.
Step 9) To execute the code mention the fully qualified name of the class i.e. the package name followed by the sub-package name followed by the class name -
java p1.p2.c1
This is how the package is executed and gives the output as "m1 of c1" from the code file.
To create an object of a class (bundled in a package), in your code, you have to use its fully qualified name.
Example:
java.awt.event.actionListner object = new java.awt.event.actionListner();
But, it could become tedious to type the long dot-separated package path name for every class you want to use. Instead, it is recommended you use the import statement.
Syntax
import packageName;
Once imported, you can use the class without mentioning its fully qualified name.
import java.awt.event.*; // * signifies all classes in this package are imported import javax.swing.JFrame // here only the JFrame class is imported //Usage JFrame f = new JFrame; // without fully qualified name.
Example: To import package
Step 1) Copy the code into an editor.
package p3; import p1.*; //imports classes only in package p1 and NOT in the sub-package p2 class c3{ public void m3(){ System.out.println("Method m3 of Class c3"); } public static void main(String args[]){ c1 obj1 = new c1(); obj1.m1(); } }
Step 2) Save the file as Demo2.java. Compile the file using the command javac –d . Demo2.java
Step 3)Execute the code using the command java p3.c3
// not allowed import package p1.*; package p3; //correct syntax package p3; import package p1.*;
the java.lang package is imported by default for any class that you create in Java.
The Java API is very extensive, contains classes which can perform almost all your programming tasks right from Data Structure Manipulation to Networking. More often than not, you will be using API files in your code. You can see the API documentation here.
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