Java中环境变量的设置

The Use of Surrouding Variation in Java

针对HelloWorld.java运行中出现的四个错误:1.Public class helloworld must be defined in a file called"Hel-loWorld.java".;2.HelloWorld is an invalid option or argument.;3.‘javac’不是内部或外部命令,也不是可运行的程序或批处理文件;(javac:Command not found);4.Exception in thread"main"java.lang.NoClassDefFoundError:HelloWorld,类路径(classpath)问题进行逐一得解决.

At the time of HelloWorld. java＇s running,there＇s four mistakes： 1. Public class helloworld must be defined in a file called ＂HelloWorld. java＂. ; 2. HelloWorld is an invalid option or argument. ; 3. ＇javac＇ is not the inner or outer order; 4. Exception in thread ＂main＂ java. lang. NoClassDefFoundError： HelloWorld, classpath. They will be solved.