Query: The Import java.util.ArrayList cannot be resolved Java

ankitdixit

Hello All, I am facing some issues while I am trying to run this java program in vs code but it shows an error on the 2nd line (The import java.util.ArrayList cannot be resolved Java(268435846)) and 6th line. But it gives correct output in an online compiler. Any suggestions?

import java.util.List;
import java.util.ArrayList;
import java.util.Collection;
public class CollectionDemo {
    public static void main(String[] args) {
        ArrayList al = new ArrayList();
        al.add(100);
        al.add("String");
        System.out.println(al);
    }
}

manonboard

https://www.boards.ie/discussion/2058220407/query-the-import-java-util-arraylist-cannot-be-resolved-java

I dont use VS code at all, but i can tell you about this error if it helps (i guess you are newish?)

So the Java class ArrayList is missing. Your package name and import look correct.

These classes come in the JRE/JDK, so i suspect your IDE tool doesnt know where your JDK is located on your local machine.

It seem VS code does not have its own implementation to start with, so you have to install it.

Here is a link that someone shows how to do that in the first answer.

https://stackoverflow.com/questions/56859959/how-to-find-and-change-java-compiler-option-in-visual-studio-code/56861298

GreeBo

If it was a missing JDK then he should also see an error with first import, but its clearly some sort of a JDK related issue alright!

OP What java version are you using in VS and what JDK did you pick for your online compiler?

cython

https://www.boards.ie/discussion/comment/118243443#Comment_118243443

EDIT: note to self, read the post fully before responding 🙁