HOW TO MAKE PACKAGE IN JAVA.?
Today we will learn how to make package
in java, but before making java package , first of all we should know about
what is java package ,and why it needs.?
Basically package are like folders which
contain java class files.package are made when we want to use some set of code
or values in another program.it decrease the size of program.when we make any
porject we make package so the program become readable and usable.when we make
package we can import it any program.
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package
<package-name>;
NOTE:The
package creation should be at starting of any program.
Example: Addition
of two numbers.
Suppose
we have two java files.First is taking the input from user and second is doing
the addition of that numbers.Both are individual file so,we will join them
using package.So,the advantage of package is that we can also make third class
which done the subtraction of the same numbers used for addition.
In
package main is create in one class and from that class we call other class by
making object of that class.When we compile package file the the file which
contains main() compile at last otherwise it will generate error.We we run
package it is run through the name of class which contain main().
Code:
1) package
is addition and the class which contain main and a object of second class is
create and call add method and pass value of a and b.
package
addition;
import
java.util.Scanner;
class
one
{
public static void main(String args[])
{
Scanner
sc=new Scanner(System.in);
System.out.println("enter
first no.");
int
a=sc.nextInt();
System.out.println("enter
second no.");
int
b=sc.nextInt();
//object
of another class is created which are in same package
two
t=new two();
//calling
of add method of another class
t.add(a,b);
}
}
package
addition;
class
two
{
//this
method is called from main class
public
void add(int a,int b)
{
int
c=a+b;
System.out.println("The
addition of two no. is: "+c);
}
}
HOW
TO COMPILE AND RUN PACKAGE:
Note:
Firstly went in the drive and folder where you have saved your jave
file.Whether it is in inside bin and any other folder.
In my case my java files are inside e:\try so,on
command prompt type:-first went inside drive by using drive name followed by
colon and press enter after that cd space folder name.if you have one more
folder inside that the do same cd space folder name.see below:-
Now
we are in the folder where we have our java file.Lets compile our files.
Syntax:
javac
–d <path of folder where you want to
create your package> <file-name.java>
Note:- d
is used for destination of package.
Example: We
have compile our both files. two.java
and one.java.one.java is coimpile after two.java because it contains main
method.
Now
we have run it,we run package by its main class name.
Syntax:
java
<package-name>.<class-name>
Example:-
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