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.
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