如何运行一个简单的Java程序

Question

I dad left Java since so long as a result now it happens that sometimes I forget the simple things and used to behave like a Stupid.

To run a Simple Java program say "Hello World" written in Notepad what do I have to Do?

I know the commands javac "Filename.java" and java "Filename" respectively to run it from the Command prompt.

But When I try to do that I got this message:

"javac is not recognized as an internal or external command, operable program or batch file."

and I could not Complie the file.

I hava little idea that we need to do some stuffs like setting the classpath or perhaps the path evnironment variables but it was exactly that I don't remember.

Can anybody please help me?

Thanks, david

Answer 1

1. Add a JAVA_HOME env variable to point to the jdk installation directory
2. To your PATH env variable, add %JAVA_HOME%\\bin
3. Add a CLASSPATH env variable to point to %JAVA_HOME%\\lib .
4. remember to open a new console window and try running javac and java - everything should be fine now.

Answer 2

这可能是有用的哥们http://www.apl.jhu.edu/~hall/java/beginner/settingup.html

Answer 3

1) create JAVA_HOME environmental variable set value to java home directory

eg c:\\program files\\java\\jdk1.5;

1) set PATH in environmental variable to your java bin directory

eg %JAVA_HOME%\\bin

and to check classpath is set correctly run javac command on cmd

and this link will help to create and run simple java application java tutorial

Answer 4

您需要JDK才能运行javac。

Answer 5

I suggest you first start coding in eclipse, it provides all the environment set up for you. Once you get good with coding, you can try command prompt compiling and running. That way, you will be confident with language first and then go into the nitty-gritties of the environment and set up.

Answer 6

Its better to use any java IDE either eclipse or netBeans Download Link But in case if you like to go through Command prompt method, then u need to set the paths. (These are the variables for your OS, that used to know where your commands eg java or javac etc are located). Hope from other answers you set the paths.

Good luck