Nick Petas

Check my blog guys.
Here is the link : http://blog.devcanvas.org

I just found the solution.
The problem is that at the 90% of the web pages they forget to add .: before the path of the jar..
Here is the correct solution :

java -cp .:/Users/Administrator/Downloads/stdlib.jar Average

Hello guys.
I am reading the excellent book Algorithms.
The author of this book is using his own libraries.
I have downloaded the libraries (it is a file called stdlib.jar) and I've store it in a directory called ~/Downloads(I am using a macbook pro).
Then I have created a project with IntelliJ Idea 14.1 using the default package (as it is the only way for a program to 'see' these libraries).
The program is running inside the ide, but because of the nature of this book, all the included code must be run from the command line.
The problem is that I cannot run for example the Average class from the command line because the system asks for the external library.
Specifically the error is :

I enter : java -cp . Average

and the Error I get is :

Exception in thread "main" java.lang.NoClassDefFoundError: StdIn
at Average.main(Average.java:11)
Caused by: java.lang.ClassNotFoundException: StdIn
at java.net.URLClassLoader$1.run(URLClassLoader.java:372)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 1 more

The Average class is the following :

public class Average { public static void main(String[] args) { //Average the numbers on StdIn double sum = 0.0; int cnt = 0; while (!StdIn.isEmpty()) { //Read a number and cumulate the sum sum += StdIn.readDouble(); cnt++; } double avg = sum / cnt; StdOut.printf("Average is %.5f\n", avg); } }

I have three classes in the same directory.
The 3rd class is using one of the others.
Although I have compiled the first two classes in the same directory , when I try to compile the 3rd class I get the classic cannot find symbol error pointing to the type that is already compiled in this same directory.
How can I overcome this problem?
Thank you.

I created a new web application project but when I am trying to run it I get the following errors :

init: deps-module-jar: deps-ear-jar: deps-jar: Created dir: /Library/Tomcat/webapps/WebApplication1/build/web/WEB-INF/classes Created dir: /Library/Tomcat/webapps/WebApplication1/build/web/META-INF Copying 1 file to /Library/Tomcat/webapps/WebApplication1/build/web/META-INF Copying 2 files to /Library/Tomcat/webapps/WebApplication1/build/web library-inclusion-in-archive: library-inclusion-in-manifest: Created dir: /Library/Tomcat/webapps/WebApplication1/build/empty Created dir: /Library/Tomcat/webapps/WebApplication1/build/generated-sources/ap-source-output compile: compile-jsps: Undeploying ... OK - Undeployed application at context path /WebApplication1 In-place deployment at /Library/Tomcat/webapps/WebApplication1/build/web /Library/Tomcat/webapps/WebApplication1/build/web/META-INF/context.xml (No such file or directory) /Library/Tomcat/webapps/WebApplication1/nbproject/build-impl.xml:720: The module has not been deployed. at org.netbeans.modules.j2ee.deployment.devmodules.api.Deployment.deploy(Deployment.java:187) at org.netbeans.modules.j2ee.ant.Deploy.execute(Deploy.java:106) at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:291) at sun.reflect.GeneratedMethodAccessor58.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106) at org.apache.tools.ant.Task.perform(Task.java:348) at org.apache.tools.ant.Target.execute(Target.java:390) at org.apache.tools.ant.Target.performTasks(Target.java:411) at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1399) at org.apache.tools.ant.Project.executeTarget(Project.java:1368) at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41) at org.apache.tools.ant.Project.executeTargets(Project.java:1251) at org.apache.tools.ant.module.bridge.impl.BridgeImpl.run(BridgeImpl.java:284) at org.apache.tools.ant.module.run.TargetExecutor.run(TargetExecutor.java:539) at org.netbeans.core.execution.RunClassThread.run(RunClassThread.java:154) BUILD FAILED (total time: 1 second)

Any ideas on what is ghoing on here?
Thank you.
(I am using snow leopard, tomcat 7, and NetBeans 7)

Thnx a lot Darryl for your answer.Now I get it.
Is there anywhere any complete api tree(maybe as an image) so that I can have a general view?

I am reading a book about java and I have the following question.

Why import java.awt.* is different from import java.awt.event.* ?

Both these imports are being used in a sample program in the book.

Thank you.

There is a constructor of view subclasses of the form :

public SubView(Context context){ super(context);

In there as I read in a book we can pass an activity.
What is the purpose of doing that?
Thank you.

The problem is that android marketplace is not available yet in many countries(for example for greece where I live).

Oh yes of course.
Now I get it.
Thanks a lot for the rapid answer!

I stumbled uppon this code :

new ClassName(this) .setMethod1() .setMethod2() .Method3();

Is it valid code and what exactly does it do?
Thank you.

ok I stopped the derby network server from running from the command prompt using derbyrun.jar.
More info about this here :
http://download.oracle.com/javadb/10.4.2.1/getstart/getstart-single.html

I tried to start java db from inside netbeans but I get this error.
I run TCPview to see what is going on and I see that the program that uses this port is java.exe
What should I do now?
Why java.exe is running even though I have closed netbeans?
Thank you.

Where exactly does it return?In the try block?

What does a single return in a catch block do?
Thank you.