How do I add my jar to Java compilation path?

Question

I'm very new to Java programming and I'm trying to add jar to the classpath like this:

javac -classpath ~/Downloads/algs4.jar. ThreeSum.java

but still I'm getting the exception like:

ThreeSum.java:38: error: cannot find symbol
                        StdOut.println(a[i] + " " + a[j] + " " + a[k]);
                        ^
  symbol:   variable StdOut
  location: class ThreeSum
ThreeSum.java:62: error: cannot find symbol
        int[] a = In.readInts(args[0]);
                  ^
  symbol:   variable In
  location: class ThreeSum
ThreeSum.java:64: error: cannot find symbol
        Stopwatch timer = new Stopwatch();
        ^
  symbol:   class Stopwatch
  location: class ThreeSum
ThreeSum.java:64: error: cannot find symbol
        Stopwatch timer = new Stopwatch();
                              ^
  symbol:   class Stopwatch
  location: class ThreeSum
ThreeSum.java:66: error: cannot find symbol
        StdOut.println("elapsed time = " + timer.elapsedTime());
        ^
  symbol:   variable StdOut
  location: class ThreeSum
ThreeSum.java:67: error: cannot find symbol
        StdOut.println(cnt);
        ^
  symbol:   variable StdOut
  location: class ThreeSum
6 errors

I'm trying the programs from here

The section Installing the textbook libraries explains how to do this. — Joe
– Joe, Commented Mar 29, 2013 at 4:57

martinez314 · Accepted Answer · 2013-03-29 04:33:22Z

2

Looks like you need to download this JAR as well: http://introcs.cs.princeton.edu/java/stdlib/

They don't have a package structure, so unpack everything in the same directory:

jar xvf stdlib.jar
jar xvf algs4.jar

Then compile it:

javac -classpath . ThreeSum.java

answered Mar 29, 2013 at 4:33

martinez314

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1 Comment

Joe Over a year ago

Or, to keep them in jars, -classpath .:stdlib.jar:algs4.jar .

Joe · Accepted Answer · 2013-03-29 04:33:34Z

1

You probably want ~/Downloads/algs4.jar. for that classpath to be ~/Downloads/algs4.jar:. on Linux or ~/Downloads/algs4.jar;. on Windows`

edited Mar 29, 2013 at 4:33

answered Mar 29, 2013 at 4:18

Joe

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