User Defined Packages In Java

This post will demonstrate the creation of user defined packages and use them. Basically we will use a Math class and an IO class. These two classes will be included in a package sample. Math class will perform all basic add, mul, sub, div operations. On the other side, the IO class will handle with input and output operations.

Screenshot[Final Output]

The Code Section

Firstly creating the Math.java file

package sample;
public class Math
{
   public int add(int a, int b)
   {
      return a+b;
   }
   public int mul(int a, int b)
   {
      return a*b;
   }
   public int sub(int a, int b)
   {
      return a-b;
   }
   public int div(int a, int b)
   {
      return a/b;
   }
}

Secondly creating the IO.java file

package sample;
import java.util.Scanner;

public class IO
{
   Scanner s;
   public IO()
   {
      s= new Scanner(System.in);
   }
   public int inputInt()
   {
      System.out.print("Enter: ");
      return s.nextInt();
   }
   public String inputStr()
   {
      System.out.print("Enter: ");
      return s.next();
   }
   public void print(int a)
   {
      System.out.println(a);
   }
   public void print(String a)
   {
      System.out.println(a);
   }
}

Finally creating the TestPack.java to import and test

import sample.IO;
import sample.Math;
public class TestPack
{
   public static void main(String as[])
   {
      IO io=new IO();
      Math m=new Math();
      String s;
      int a,b;
      a=io.inputInt();
      b=io.inputInt();
      s=io.inputStr();
      io.print("Add is "+m.add(a,b));
      io.print("Mul is "+m.mul(a,b));
      io.print("Sub is "+m.sub(a,b));
      io.print("Div is "+m.div(a,b));
      io.print("The String Entered is : "+s);
    }
}

Note:
To compile the package classes i.e. Math and IO you need to type the bellow code if using the console to compile.

$ javac -d <filename>.java

For this program, replace filename with Math and IO.

Final Words:
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