How to compile Java class with external library in Windows command line?

Question

I have an assignment: Write a client program Permutation.java that takes an integer k as a command-line argument; reads in a sequence of strings from standard input using StdIn.readString() ...

Here is my code:

public class Permutation {
    public static void main(String[] args) {
         int k = Integer.parseInt(args[0]);
         String[] inputStrings = StdIn.readStrings();
    }
}

How to compile it in Windows command line?

I tried

javac Permutation.java

But got an error

error: cannot find symbol String[] inputStrings = StdIn.readStrings();`

I use IntelliJ IDEA, external library StdIn is added to the project.

Answer 1

To compile it with the library you have to add it to the classpath. This is accomplished with the -cp argument followed by the library which contains your referenced class.

javac -cp StdIn.jar Permutation.java

To run it with command line, similarly use

java -cp StdIn.jar Permutation

See also https://docs.oracle.com/javase/8/docs/technotes/tools/windows/javac.html