Communities

Writing
Writing
Codidact Meta
Codidact Meta
The Great Outdoors
The Great Outdoors
Photography & Video
Photography & Video
Scientific Speculation
Scientific Speculation
Cooking
Cooking
Electrical Engineering
Electrical Engineering
Judaism
Judaism
Languages & Linguistics
Languages & Linguistics
Software Development
Software Development
Mathematics
Mathematics
Christianity
Christianity
Code Golf
Code Golf
Music
Music
Physics
Physics
Linux Systems
Linux Systems
Power Users
Power Users
Tabletop RPGs
Tabletop RPGs
Community Proposals
Community Proposals
tag:snake search within a tag
answers:0 unanswered questions
user:xxxx search by author id
score:0.5 posts with 0.5+ score
"snake oil" exact phrase
votes:4 posts with 4+ votes
created:<1w created < 1 week ago
post_type:xxxx type of post
Search help
Notifications
Mark all as read See all your notifications »
Q&A

Welcome to Software Development on Codidact!

Will you help us build our independent community of developers helping developers? We're small and trying to grow. We welcome questions about all aspects of software development, from design to code to QA and more. Got questions? Got answers? Got code you'd like someone to review? Please join us.

Comments on Java cannot find class within same package

Post

Java cannot find class within same package

+1
−3

I've written a class object, QueueObject, but when I try to construct it inside of my main class, it says it cannot find the symbol on compilation. I've read lots of pages saying how misspellings or import failures could cause it but both files are in the same package and I double checked spelling although I think Eclipse would tell me if I spelled QueueObject wrong.

QueueObject.java

package disksim;
public class QueueObject { 
//The total time the object has been inside the queue for
private double time;

//The objects position, 0 >= x <= 1023
private int id;

public QueueObject(int id) {
	this.time = 0.0;
	this.id = id;
}

public int getId() {
	return id;
}

public double getTime() {
	return time;
}

public void setTime(double time) {
	this.time = time;
}

public void addTime(double time) {
	this.time += time;
}
}

MainClass.java

package disksim;
public class MainClass {

private static String algore;
private static int Qsize;
private static String filePath;
private static ArrayList<QueueObject> queue = new 
    ArrayList<QueueObject>(Qsize);

public static void doFIFO() {
	File data = new File(filePath);	

	try {
		Scanner in = new Scanner(data);
		
		while (in.hasNextLine()) {
			if (queue.size() != Qsize) {
				queue.add(new QueueObject(Integer.parseInt(in.nextLine())));
			}
		}
		System.out.println(queue.toString());
		in.close();
	} catch (FileNotFoundException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	}

}

Compilation Errors

Command Line Compilation Error

History
Why does this post require attention from curators or moderators?
You might want to add some details to your flag.
Why should this post be closed?

2 comment threads

Compilation errors as text, not image (2 comments)
Are you compiling from the source root directory? (5 comments)
Are you compiling from the source root directory?
Moshi‭ wrote over 2 years ago

See https://stackoverflow.com/a/3749272. Are you compiling from the source root directory?

cuzzo‭ wrote over 2 years ago · edited over 2 years ago

I compiled it from the folder that both files were inside of. I am not sure if that is the same thing as the source root directory or if it was one folder back

Moshi‭ wrote over 2 years ago

Try going back a directory. I imagine that you have some top-level directory for your entire project, right? You should compile from there.

hkotsubo‭ wrote over 2 years ago

cuzzo‭ How are you compiling those files?

I could reproduce the error, but it happens only if I compile MainClass.java before QueueObject.java (just javac MainClass.java before compiling QueueObject). If I compile both (such as javac *.java or even javac MainClass.java QueueObject.java), it works. If I use an IDE (that does the compiling stuff for me), it also works. Are you compiling using the command line as I did?

elgonzo‭ wrote over 2 years ago · edited over 2 years ago

I second hkotsubo's opinion. For additional information about how the javac compiler looks for types (or their respective source files), see the official Java compiler documentation: https://docs.oracle.com/en/java/javase/18/docs/specs/man/javac.html#searching-for-module-package-and-type-declarations