如何运行简单的 Java 程序
我爸爸离开Java很久了，结果现在有时我会忘记简单的事情，并且表现得像个傻瓜。
要运行一个用记事本编写的简单 Java 程序，说“Hello World”，我需要做什么？
我知道命令 javac "Filename.java" 和 java "Filename" 分别可以从命令提示符运行它。
但是，当我尝试这样做时，我收到此消息：
“javac 不被识别为内部或外部命令、可操作程序或批处理文件。”
我无法编译该文件。
我不知道我们需要做一些事情，比如设置类路径或者路径环境变量，但我确实不记得了。
有人可以帮我吗？
谢谢， 大卫
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
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JAVA_HOME环境变量以指向 jdk 安装目录PATH环境变量中，添加%JAVA_HOME%\binCLASSPATH环境变量指向%JAVA_HOME%\lib。javac和java- 现在一切都应该没问题了。JAVA_HOMEenv variable to point to the jdk installation directoryPATHenv variable, add%JAVA_HOME%\binCLASSPATHenv variable to point to%JAVA_HOME%\lib.javacandjava- everything should be fine now.1) 创建 JAVA_HOME 环境变量并将值设置为 java 主目录，
例如
c:\program files\java\jdk1.5;1) 将环境变量中的 PATH 设置为 java bin 目录，
例如
%JAVA_HOME%\bin并检查类路径是否设置正确，在 cmd 上运行
javac命令，此链接将有助于创建和运行简单的 java 应用程序
Java 教程
1) create JAVA_HOME environmental variable set value to java home directory
e.g.
c:\program files\java\jdk1.5;1) set PATH in environmental variable to your java bin directory
e.g.
%JAVA_HOME%\binand to check classpath is set correctly run
javaccommand on cmdand this link will help to create and run simple java application
java tutorial
这可能有用，伙计
http://www.apl.jhu.edu/~hall/java /beginner/settingup.html
this might be usefull budddy
http://www.apl.jhu.edu/~hall/java/beginner/settingup.html
您需要 JDK 才能运行 javac。
You need the JDK to be able to run javac.
我建议你首先在 eclipse 中开始编码，它提供了为你设置的所有环境。一旦熟悉了编码，您就可以尝试命令提示符编译和运行。这样，您将首先对语言充满信心，然后深入了解环境的细节并进行设置。
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.
最好使用任何 java IDE，无论是 eclipse 还是 netBeans 下载链接
但如果您喜欢通过命令提示符方法，那么您需要设置路径。 （这些是您的操作系统的变量，用于了解您的命令（例如 java 或 javac 等）所在的位置）。希望您从其他答案中设置路径。
祝你好运
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 e.g. java or javac etc are located). Hope from other answers you set the paths.
Good luck