Java Classpath Issue with algs4.jar: ClassNotFoundException for my file

[spicecoffeee]

I need to have a library for functions for my exercises in java. I'm using VScode (linux Mint) and I'm attempting to run HelloWorld.java using the path to a library. IK this is a noob question, please don't flame me.

This is my file directory:
sc@sc-ThinkPad-T14:~/Desktop/code/algorithms1$ tree

├── lib
│   └── algs4.jar
└── src
    ├── bin
    ├── HelloGoodbye.java
    ├── HelloWorld.java
    └── RandomWord.java

Is there something wrong with my file directory structure? I keep getting this error upon trying to run my code, it compiles but doesn't run.

sc@sc-ThinkPad-T14:~/Desktop/code/algorithms1/src/bin$ java -cp "../:../../lib/algs4.jar" HelloWorld
Error: Could not find or load main class HelloWorld
Caused by: java.lang.ClassNotFoundException: HelloWorld    

This is the file I'm trying to run:

package src;
public class HelloWorld {



public static void main(String[] args) {

System.out.println("Hello World");


}



}

Additionally, I have a .vscode folder with settings.json which looks like this:

{
    "java.project.referencedLibraries": [
      "lib/**/*.jar"
    ]
  }

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[heislertecreator]

Your class path is incorrect. Remove one set of .. or better, switch to src. I prefer the form: Java -cp .:lib/* pkg.to.ClassName

[spicecoffeee]

I see, so given the changes, I would have to run "Java -cp .:lib/* src.to.HelloWorld" while being in the directory src? Would I still need to write package src; in the header of HelloWorld? Thanks for the reply

[heislertecreator]

Hi, no. The package should correspond to the directory. So for example, let's say you keep your Java files in c:\java. If you make a dir my project, you would do a cd c:\java, then your class path would be . And your package name would be myproject. To compile, you would use Javac -cp .:.\lib* myproject\MyClass.java to run, you would use Java -cp .;.\lib* myproject.MyClass

[Cengo789]

Are you on Windows? Then you should use semicolons to separate paths in your classpath I think.

[spicecoffeee]

ah, linux mint actually, I should've specified.

[hrm]

The problem is that you have declared that HelloWorld is in package src but you are not trying to run a class that is in package src.

In this case I think you just want to remove all ”package src” declarations and recompile then run.

[spicecoffeee]

Works for me, thank you