Access method from user defined package in java

Question

Here is my package arithmatic inside which a file called arith.java

package arithmatic;

 public class arith{

     public int add(int a, int b){
     return(a+b);
     }
}

and outside the arithmatic package a file packagedemo.java

import arithmatic.*;
public class packagedemo{

public void disp(int a, int b){

    System.out.println("Addition is : "+ add(a, b));
}

public static void main(String args[]){

    packagedemo pd=new packagedemo();
    pd.disp(20,10);
}
}

after compiling it gives me error as,

packagedemo.java:6: cannot find symbol
symbol  : method add(int,int)
location: class packagedemo
            System.out.println("Addition is : "+ add(a, b));

I really dont understand why this error occurs any solution please?

Juned Ahsan · Accepted Answer · 2014-01-04 05:55:09Z

1

By simply importing a class, you cannot directly access a class member method like this

add(a, b)

You first need to create and instance of your arith class and then call add method using that instance. Something like this:

public void disp(int a, int b){

    arith arithObj = new arith();
    System.out.println("Addition is : "+ arithObj.add(a, b));
}

answered Jan 4, 2014 at 5:55

Juned Ahsan

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2 Comments

Darpan Kulkarni Over a year ago

now it is saying, packagedemo.java:6: cannot find symbol symbol : class artih location: class packagedemo artih ar=new arith(); ^

Juned Ahsan Over a year ago

@Darpan just make sure the class names and package imports are correct.

Suresh Atta · Accepted Answer · 2014-01-04 06:00:57Z

0

You need to create instance of arith since the method add is an insntance member of that class.

public void disp(int a, int b){
    Arith art= new Arith();
    System.out.println("Addition is : "+ art.add(a, b));
}

As a side note please follow java naming conventions ,Class name starts with capital letter.

public class Arith{

I guess you are checking the package level accesses, in that case you are looking for protected modifier for your add() method. So when you create instance of Arith insntance in other packages you won't have access to that protected member. Now it is public so, you can use it.

edited Jan 4, 2014 at 6:00

answered Jan 4, 2014 at 5:55

Suresh Atta

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4 Comments

Juned Ahsan Over a year ago

@SURESH ATTA class name is sadly starting with small case arith and not Arith :-)

Suresh Atta Over a year ago

I saw OP declared class arith, so I corrected it as I cannot do the same mistake again :)

Juned Ahsan Over a year ago

No still in the code you have provided it is Arith art= new Arith();

Suresh Atta Over a year ago

I provided the code with that correction. Not used the same code given by OP.

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