How to run a .class file that is part of a package from cmd?

Question

I keep getting errors when I make my .class part of a package and try to run it from cmd.

Here\'s the code that works after using jav

Answer 1

Simple Solution in Linux, same principle:

Say, the File is /work/packageName/file.java, with a first line:

package packageName;

Under the working directory /work/packageName/*:

javac file.java will not work, as long as file.java contain any reference to other files in that package. The solution is to use this:

javac --class-path  ../  file.java

Or go 1 level up to /work/* and run:

javac  ./packageName/Member.java

Or simply use java instead of javac to execute.

Answer 2

Run the program from the parent directory of the com directory.

java com.HelloWorld

Answer 3

Suppose you did cd C:/projects and HelloWorld.class is in C:/projects/com, then just type:

java com.HelloWorld

Answer 4

Create a folder named com under Java folder and put the HelloWorld.java into com folder. Then run again javac and java.

Answer 5

Suppose the file locates at C:/projects/com/HelloWorld and you can try the following ways.

1.java -cp c:/projects com.HelloWorld

2.cd c:/projects
 java com.HelloWorld
(The example 2 is not working in many situation,such as java process.)

if there is no package declaration and there will be a little change.

1.java -cp c:/projects/com HelloWorld

2.cd c:/projects/com
 java HelloWorld
(It's not good with the same reason.)

alternatively,relative path will be ok but has some risk. Last remember put the class file in end of cmd.

Answer 6

When you compile the java code, use -d, in your case, it would be

javac -d . com.HelloWorld.java

After the above command, java compiler generate a folder named "com", under the "com" folder, you will see your HelloWorld.class

Then under the same folder as you run javac, run the following command

java com.HelloWorld