我正在弄清楚我必须做什么才能使用 Java 将“Hello World”打印到我的 PC 中。
主要是当我编译代码时，当我想运行它时，会出现：
图片： 点击查看图片
实际代码错误：
`C:\Users\Pedro\Documents\java>java Myfirst
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.UnsupportedClassVersionError: Myfirst has been compiled by a more recent version of the Java Runtime (class file version 57.0), this version of the Java Runtime only recognizes class file versions up to 52.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at …