A Java package is a set of classes which are grouped together. This grouping helps to organize Java classes and interfaces classes with the same name.
- A package provides a unique namespace for the types it contains.
- Classes in the same package can access each other’s package-access members.
Creating package
package world;
public class HelloWorld {
public static void main(String[] args) {
System.out.println(“Hello World”);
}
}
Calling package
import world.*;
import world.moon;
PATH: maintains a list of directories. The OS searches the PATH entries for executable programs, such as Java Compiler (javac) and Java Runtime (java).
CLASSPATH: maintain a list of directories (containing many Java class files) and JAR files (a single-file archive of Java classes). The Java Compiler and Java Runtime searches the CLASSPATH entries for Java classes referenced in your program.
