Error: cannot find symbol

Data Structures
1

I just started learning, and I follow what the video said to type out all the code, but I got the error message said cannot find the symbol. Is there anyone know why the Array symbol cannot be found? I create my own package name, but I did choose the Array from the one I create.

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Appricate for help!
Johnson Tsai

2

And you have an import statement at the top of your Main.java e.g. import yourPackage.Array?

3

Yes, here is my code.

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4

Because these classes are in the same package, I think you might not need the import statement. If you remove it, does it make a difference?

5

Interesting thing is I grab Mosh’s source code, and run the code, and got the same error message.

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6

I think you have to compile the Array class first in order for that to work which typically looks like this (not sure if it is different on Windows):

javac *.java

# Alternatively, just the two classes you need:
# javac Array.java Main.java

Then you would run the compiled Main class’s bytecode:

java Main

I believe running the command you ran is only compiling Main.java (rather than including all of its dependencies):

java Main.java

NOTE: you can probably also do this in your IDE (looks like IntelliJ) there by right clicking on the main method in Main.java and then selecting whatever option the IDE has for running the Java code (possibly need to add an extension first).

7

Thank you for your suggestion, using the right click to run the program, then it works.
but I still can’t use the terminal to run the program directly.

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8

Actually, it looks like IntelliJ printed out the exact command line it executed in the terminal if you want to try copy-pasting that. If Java is in the PATH variable, you should not need to specify the full path to java.exe ("C:\Program Files\Java\...\java.exe") and can just use java.exe. The -javaagent:... flag also looks optional if you want to drop that flag.