Olá,
Não estou conseguindo executar a instrução "java Programa", está sendo exibido um erro no prompt do MS-DOS. Fiz todos os passos, consegui compilar ("javac Programa.java" deu certo) e foi gerado o Programa.class normalmente, mas a instrução "java Programa" deu o erro descrito abaixo: (As versões do JRE e JDK que tenho são, respectivamente, a 8 (update 121) e 11.0.2, ambas de 64 bits)
C:\Users\Rafael\Desktop\Java parte 1 Primeiros passos>java Programa
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.UnsupportedClassVersionError: Programa has been compiled by a more recent version of the Java Runtime (class file version 55.0), 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 java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)
