error : package does not exist //HELP!

Question

//This is my code to build a package.
public void aClass(){
System.out.println("This is my package!");
}
public static void main(String[] args){
MyPackageClass obj = new MyPackageClass();
obj.aClass();
}
}
//Then I tried to run the package.
//Another java file
import mypack.MyPackageClass;
public class MyClass {
public static void main(String[] args){
MyPackageClass obj = new MyPackageClass();
System.out.println(MyPackageClass());
}
}
//The name of the file match the class name.
//The examples I went through is all in command prompt. But I am using
//jgrasp so I will not see something like "javac –d .. demo.java"
//so I think the examples do not suit me
//Can U help explaining this? Thank you

Answer 1

I don't know if it's going to help in your case, since I don't know what OS you are using, but on Windows, everytime you create some jar file, you have to add it to the CLASSPATH Environment Variable or place it in a folder that is checked by your environment (just as apache-tomcat). Perhaps it's the same for packages.

Answer 2

Ya I am using Windows, the classpath... ok I try to find the solution based on that keyword. But "add the java file to the CLASSPATH Envirionment Variable", does it means what we usually do, that is when I try to run a java file in JDK? By the way, I only knew the word "Environment variable" when I installed the JDK. Anyone please?