如何解决在电脑cmd输出的java命令后出现错误

Question

在电脑上的cmd输出了java的命令后出现了错误无法加载主类，在网上查了各种的方法有说环境变量的问题还有其他什么的都是试 过了还是不行，求解好吗

Answer 1

有先javac吗 编译生成class文件？

Answer 2

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Answer 3

应该是jdk没有按照成功。可以根据网上的教程重新按照以下jdk，希望采纳，谢谢

Answer 4

在cmd下输入java或者javac看环境变量是否错误，还有就是生成了字节码文件.class文件，输入java Hello  中间一定要空格隔开，亲测哦

Answer 5

发下报错信息你要学习一下如何问问题