Develop Reference

how to import classes from another package in java

I have a class Student_results in the package Students_Record and I want to import that to a class in the package Forgot. I have:
package Students_Record;
public class Student_results extends javax.swing.JFrame {
and
package Forgot;
import Students_Record.Student_results;
It says "package Students_Record does not exist".
Edit.
I am using NetBeans IDE 8.2.
Both project folders are in my "NetBeans Projects" folder.
What am I doing wrong? Thanks.

On your project Forgot click right -> build path -> projects. Add your project here (i.e import Students_Record).

Your import statement is correct.
Possible cause
pre-compiled import issue.
[if using plain text editor like notepad then compile Students_Record first using javac and then compile class in Forgot.
detailed ref : Importing java classes text editor
[if using IDE like eclipse then click save all in toolbar.]
those packages might be in different projects. provide folder location as asked by #TheScientificMethod.
if you are trying to import from jar then make sure of your classpath values.
[if using plain text editor like notepad then set classpath value.]
[in case of eclipse IDE, refer build path by checking Properties
section.]
Note- Always follow standard programming conventions for any programming language. Correct your package, class names accordingly.
Reference - https://www.oracle.com/technetwork/java/codeconventions-150003.pdf,
https://www.oracle.com/technetwork/java/javase/overview/codeconvtoc-136057.html

How to import file from other folder in java?

I have just started learning java, so struggling in very basics. The problem i am facing currently is "cannot find symbol : class Ques". I have resolved this issue when i was accessing package from parent directory through CLASSPATH export. Now problem is i am trying to access sub-directory from sub-driectroy like this:
family.of.adam(has)/
father.java
WifeOne(sub-direc)/wifeone.java,ChildFromWifeOne.java
WifeTwo(sub-direc)/wifetwo.java,ChildFromWifeTwo.java
Now what i am trying to do is from wifetwo.java i am accessing wifeone.java. I have tried importing (wifeone)like this:
import family.of.adam.WifeOne.*;
import WifeOne.*;
In both cases it failed to import and same error occured which i mentioned above.
I have also tried solution provided in this Question but this effects classpath of WifeOne this is what i think because when i -cp method it starts showing errors related to wifeone.
I am using normal texteditor, compiling through terminal and using mac. Kindly brief me what mistake i am doing.

Assume src is your base folder(place you compile and run the program).
src/family/of/adam/FirstWife.java
if so you need to define the package startmetn the fist line of the FirstWife.java file.
package family.of.adam;
Then,If the second java file in the,
src/Main.java
In Main.java file you need to define the import statement for user the FirstWife.java class.
import family.of.adam.FirstWife;

error package org.python.util does not exist, compilation with ant

I am trying to call a python method in java, similar functionality as Unresolved import org.python / working with jython and java?
However, I am using ant to compile and run my files. using import org.python.util will give me this error
package org.python.util does not exist
I can see that python.org.util exists in jython-2.5.0.jar.
So, here is the class path I have in my build.xml ant file:
classpath="${java.class.path}:./jgrapht/lib/jgrapht-jdk1.5.jar:\
./jgrapht/lib/jgraph.jar:./jgraphx/lib/jgraphx.jar:\
./jython/lib/jython-2.5.0.jar:./colt/lib/colt.jar:."
and I also I added the path to jython jar files to my class path. i.e. looks like echo $path gives me all the required paths. Is there anything missing here that I am not aware of?

Try this to make all classes in the package available:
import org.python.util.*;
Or this to include a particular class:
import org.python.util.TemplateAntTask;
EDIT: Also, looks like there is an extra slash after jython-2.5.0.jar in your classpath.

Problem with the import of packets in antlrworks

Have to create a package defined by me, containing some of the classes, and I recall that package in a file .java created of the program AntlrWorks in which i did the import. Package named "com.project.redfox" . I compiled the code with the command: "javac Test.java provaParser.java provaLexer.java" but I get the error that not exist the package.
In the grammar have added :
grammar prova;
#hader{
import com.project.redfox;
}
....something......
I created the package "com.project.redfox" within of the project redfox developed in NetBeans, therefore the directory com/project/redfox is in the directory redfox.
how can I solve this problem?

To formally answer your question: javac can't find the package com.wikirates which you are probably using in com.project.redfox.
Note that I assumed redfox is a class. If it's a package, you need to import all classes from it like this: import com.project.redfox.*; instead of import com.project.redfox; (assuming that there are classes in com.project.redfox...).

Importing a Java Package in root directory

I am in a sub domain subdomain.site.com and there is a java package higher up in the root directory at /usr/share/sphinx/api/java.
The typical thing to do to import this package would be to write
import sphinx.api.java;
However when I just do that, I get a package does not exist error.
What's the solution to this? Some sort of path definition?
(Im on Linux CentOS)

That isn't a package, that is a directory structure. I seriously doubt that is a actual package definition. If a class is there, it probably is in the default package which in the newer JDKs can't be imported.

you're missing the semi-colon at the end of the line:
import sphinx.api.java;