CODEWITHSUNDEEP
javalinux
hanugm
hanugm

Reputation: 1417

StdIn not working... @ Linux

Below is the program.. I tried after moving jars also... Is moving enough ? or any extra task to do with the jar files .

public class Stack {
    public static void main(String[] args) {
           while (!StdIn.isEmpty()) {
        }
    }
}

i moved necessary jar(stdlib.jar,algs4.jar ) files to lib ..... But it still showing the error.......

Stack.java:4: error: cannot find symbol while (!StdIn.isEmpty()) { ^ symbol: variable StdIn location: class Stack 1 error

Thanks in advance :)

Upvotes: 1

Views: 1377

Answers (3)

Stephen C
Stephen C

Reputation: 719279

I don't know where you got this Stdin.isEmpty() stuff from, but this does not bear any resemblance to any standard Java APIs.

The simple way to read from standard input in Java is to do something like this:

    Scanner scanner = new Scanner(System.in);

and then call methods on the scanner object to read stuff. Refer to the javadocs for Scanner for details of how to use it.

On the other hand, if Stdin is a real class that you have written, or that is defined in some 3rd-party library (maybe "stdlib.jar"?), then the problem is:

  • the directory or JAR file containing the class is not on your classpath, or
  • you haven't imported into this class, or
  • both of the above.

The procedure for adding something to the classpath depends on how you are building (i.e. compiling) the code, and how you are then running it.

Upvotes: 2

Jacob Tomaw
Jacob Tomaw

Reputation: 1391

StdIn is not a Java keyword or class in the java.lang package. In order to use a class defined in your jars you must include the jar in your classpath and import the package or class to your class.

Upvotes: 0

sasha.sochka
sasha.sochka

Reputation: 14715

You need to setup your classpath to use external java libraries

If you are using eclipse, you could Project - > Properties -> Java build path ->add Jar. That jar file should be placed in a directory inside your workspace (lib/ for example)

Upvotes: 1

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