How to load .java file to compiler?

Ok, I am beginner in JAVA. I have just started. I downloaded Java SE Development Kit 6u21 and wrote a program, saved it in .java and try to 开发者_Go百科run it, but I can not do it. What's wrong? Thank you.

You will need to compile it first using javac:

javac YourClass.java

And then run:

java YourClass

If you really want to do it manually, you have to use the javac compiler in command line like this :

javac package/of/your/project/YourClass.java

and then

java package.of.your.project.YourClass

Your class YourClass must have a public static void main(String... args) method.

If your class isn't in a package, then javac YourClass.java and java YourClass are sufficient.

You should really consider to use an IDE which will handle this for you.

Resources :

• javac documentation
• java documentation

On the same topic :

• Compiling multiple packages using the command line in Java
• Compiling/running a java program in a different directory.

I suggest you read and follow this tutorial by Oracle: "Hello World!" for Microsoft Windows. Once you have successfully done so, you should have JDK installed and know how to run your program.

If you are still getting "'javac' is not recognized as an internal or external command, operable program or batch file", try reading these: How do I set or change the PATH system variable? and PATH and CLASSPATH.