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java error:  can't find symbol

Posted on 2014-02-26
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Last Modified: 2014-02-27
I have a problem.  I don't understand how to use a constructor with an instance class.  I created the math classes and set up a demo class but the specific stub doesn't work with factorial class and I get the error can't find the symbol factorial.  Are the classes formulated correctly and if not what do I need to do to have the factorial class recognized? I am new to java and trying to catch up in a class about it.  mathclass.java
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Question by:tangocoder
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zzynx earned 2000 total points
ID: 39891164
Replace
factorial afact = new factorial(num);

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by
factorial afact = MyMath.factorial(num);

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Expert Comment

by:zzynx
ID: 39891166
>>  what do I need to do to have the factorial class recognized?
factorial is not a class. MyMath is a class (containing only static methods)
To call a static method of a class you write

<ClassName>.<method name>(<method parameters if any>)
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by:tangocoder
ID: 39891207
Now the problem is that factorial in TestMyMath class is giving can't find symbol error.  How do I initialize factorial to be defined in this class?
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LVL 37

Expert Comment

by:zzynx
ID: 39891227
By importing your MyMath class, the way you imported the JOptionPane class by writing:
import javax.swing.JOptionPane;

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So, you should write somehting like:

import <path of your MyMath class>.MyMath;

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Expert Comment

by:zzynx
ID: 39891241
Normally each of your classes has as a first line something like:

package com.MyFirm.whatever;

If both your MyMath class and your TestMyMath class are in the same package (and have the same package line, that import is not needed since they "see" each other)

If the MyMath class is in another package, you have to tell your TestMyMath class in which package it has to look to find the MyMath class via that import instruction.

Some explanation about packages: http://www.tutorialspoint.com/java/java_packages.htm
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Expert Comment

by:mccarl
ID: 39891670
Can you post your updated code? And post each .java file separately and exactly as you have it.
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Expert Comment

by:zzynx
ID: 39894149
Thanx 4 axxepting
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