Odd behaviour when importing classes

Question

I am currently using DrJava and when I write the following import statement:

import java.util.Arrays;

I get the following error message:

Error: The import java.util.Arrays cannot be resolved

What am I doing wrong? The other import statements work perfectly fine.

import java.util.Random;
import java.util.Scanner;

Try to compile the program with javac and see if it reports an error. If not DrJava needs an examination! The java.util.Arrays class has been part of the JDK since 1.2, so as far as I can determine the import is correct. — ewramner, Mar 09 '19 at 18:55
@ElliottFrisch My professor teaches with DrJava so I didn't really had a choice — Maya, Mar 09 '19 at 18:56
@Maya Did you install the `JRE` correctly? Double check that. And check project properties — Hasitha Jayawardana, Mar 09 '19 at 18:57
@ewramner I get this error message when I compile my code. The message pops up even if only the import statement is present. — Maya, Mar 09 '19 at 18:57
@Maya Check your program files folder. Where did you install the JDK? — Hasitha Jayawardana, Mar 09 '19 at 18:59
@HasithaMJayawardana I downloaded it and created a shortcut on my desktop — Maya, Mar 09 '19 at 19:00
@AndyTurner Yes, that's why I need the import Array statement — Maya, Mar 09 '19 at 19:16
@Maya I think you misunderstand: I am not asking if you are invoking a method from `java.util.Arrays`, I am asking if you have *declared* your own class called `Arrays`. — Andy Turner, Mar 09 '19 at 19:18
@AndyTurner Do you mean if I called my class Arrays? If so, no I didn't. — Maya, Mar 09 '19 at 19:21
I meant compile the code from the command line with javac, not from the IDE (DrJava). That way you can compare. Or post the program so we can reproduce. — ewramner, Mar 09 '19 at 19:34
@ewramner Oh ok so type run class_name in the command line of Dr Java? — Maya, Mar 09 '19 at 19:39
No, create a text file named YourClass.java and invoke "javac YourClass.java" from a command prompt in your operating system in the folder where you put the java file. — ewramner, Mar 09 '19 at 19:55

System.out.println · Answer 1 · 2020-11-19T20:36:27.433

I don't know if you keep having this problem with DrJava, but I'll post my solution in case someone else has the same issue.

I had exactly the same problem as you mentioned in DrJava. It would continuously show the same error, while invoking a method from java.util.Arrays, such as .toString(). I had downloaded the old stable release of DrJava (Windows App) through their website, as well as installing the latest updated JDK version. However, this didn't solve the problem. I tried installing other IDE, such as Eclipse, and it worked perfectly.

Thanks to a friend of mine who had the same problem, I was able to fix this. It worked for the both of us.

Try installing the latest current stable release drjava-beta-2019-220051: (https://sourceforge.net/projects/drjava/files/).

And for the JDK, I used the jdk-8u25-windows-x64 (this may vary with your OS and processor type): (https://www.oracle.com/java/technologies/javase/javase8u211-later-archive-downloads.html)

I'm not sure if this would be the best solution. But after this, it worked perfectly, as I was able to access all methods. Despite this, I still kept installed the latest JDK, which helped me to keep using Eclipse.

Good luck!

Odd behaviour when importing classes

1 Answers1