Java会编译我的程序，但是我无法运行它

Question

I want to run a Java file with the following source code:

package u0a1;
public class HelloWorld {

    public static void main(String[] args) {

        System.out.println("Hello World!");

    }

}

To run the file I did the following things: C:\\.. \\u0\\u0a1> javac HelloWorld.java (this works, class file is created) Then I try to run it with:

C:\..\u0> java u0a1.HelloWorld 

This step doesn't work. Main class could not be found.

I also tried

C:\..\u0\u0a1> java HelloWorld
C:\..\u0> java u0a1\HelloWorld 

None of them worked.

Answer 1

This is a piece i found somewhere else, worked for me.

Have you set your JAVA_HOME correctly? If not you have to work with the full path

Example: "C:\\Program Files\\Java\\jdk1.7.0_51\\bin\\javac.exe" HelloWorld.java

If you have runtime issues, you should work it out like this

Select MAIN directory - not package directory

java u0a1/HelloWorld

If you have problems with CLASSPATH or JAVA_HOME - try this: "C:\\Program Files\\Java\\jdk1.7.0_51\\bin\\javac.exe" HelloWorld.java

source: http://quandano.com/questions/how-to-run-a-java-file-within-a-package-from-cmd

Answer 2

You are compiling a program of package , so it should compile this way

C:.. \\u0\\u0a1> javac -d . HelloWorld.java

here -d for creating package u0a1

and " . " for from current working directory

after compiling this way a folder will create with name "u0a1"

then other thing will work properly