All Questions
27
questions
0
votes
0
answers
151
views
What are the visibility rules for package com.sun.tools.javac.code in oracle open jdk version 20?
I am writing a database management program in java in maven in intellij IDEA. For now, the code is only connecting me to the database in MySQL. The code itself has no errors. However, upon running it, ...
- 1
1
vote
1
answer
653
views
WHY Java doesn't have the concept of Subpackage visibility [duplicate]
Java doesn't have the concept of Subpackage visibility
I know that :(
Java: Subpackage visibility?
so if I have a Class A (package visible) inside the package com.example.foo
and another Class B (...
- 1,313
1
vote
2
answers
141
views
Can I use packages without making all of the methods/ attributes public?
I have a project with about 10 classes. I moved some classes to a package for clarity. Is there a safe way to connect between classes without data leaks? -using public is dangerous because anyone can ...
- 353
0
votes
0
answers
57
views
Unable to create instance of class in sub-package
Why I can not create in class KeyboardController instance of Frame like:
Frame frame=new Frame();
It is not recognized by IDEA.
Is it because classes in lower package can not see and work with ...
- 185
4
votes
1
answer
2k
views
How to work around that there's no subpackage visibility in Java
When I'm writing a new component with DDD I try to have one single public class in a package with all collaborators of my component package protected.
That usually plays out very nicely, because ...
- 10.3k
0
votes
1
answer
301
views
Why can't I call a package-private method of another class that's a subclass of a class in the same package?
I have a class Base in package A that defines the package-private method foo(). In package B, I have a class Impl that extends Base. In package A, if I try to call foo() on an instance of Impl, I ...
- 793
1
vote
2
answers
61
views
Java: protected, visibitily [duplicate]
I'm a bit confused about the whole protected thing in java. If something is protected only the classes within the same package can access it, right?
Should we use protected private attributes in a ...
- 27
1
vote
1
answer
21
views
Hiding libs packages to implementators
Am writing a lib where I have a package with several classes inside, one of this classes is the final class Point( that is used by many other classes but has no public access outside its package
in ...
- 48.1k
1
vote
0
answers
40
views
Design package hierarchy in java, visibility constraints [duplicate]
I have a package ts, containing interfaces for ticket system. I also have hts package, containing concrete implementation of ts. I have TicketSystem.class in ts, and HTicketSystem.class in hts ...
- 907
1
vote
1
answer
866
views
Accessing top level classes from within a Java package
Say we have a project located at folder project with the sources in project/src.
We have a package package at project/src/package and classes
TopClass in project/src/TopClass.java, and
PackageClass ...
- 200
2
votes
4
answers
7k
views
How to get class'es method without importing class
There is a situation:
package pak1 contains some class
package pak1;
public class A {
public void g() {}
}
and another package pak2
package pak2;
public class B {
public void f() {
...
- 333
0
votes
2
answers
8k
views
How to access a protected variable from another package
Here I want to access that protected variable rollno to my another package package2.
So guys I have put both programs:
So here when I run Check.java it throws an error not defined @ Protected1
the ...
0
votes
2
answers
741
views
Eclipse - I want to access a class from the same package but under a different project, how?
I use Eclipse IDE for my Java projects and all my projects(Project_1,Project_2 and so on) related classes are inside a package package_name.
I am currently working on 2 classes.
class_name.java(...
- 1,674
0
votes
1
answer
158
views
Eclipse Java: using existing source-code as different packages (due to visibility)
I have 3 different Java-projects:
Project A: some basic functionality (Package: "com.a.b.c")
Project B: should be a library and uses A (Package: "com.b.c.d")
Project C: should be a library and uses A ...
0
votes
0
answers
354
views
Is it possible to make an interface extendable without it being implementable?
To make what I think is a reasonable analogy, suppose I have a "drink" interface. I can fill it, dump it, and maybe do some other things. I need to know how many people are drinking this drink before ...
- 21