いつも大変お世話になり、誠にありがとうございます。 標記の件。 public class Main2 { public static void main(String[] args) { for (int i = 1; i < 10; i++) { for (int j = 1; j < 10; j++) { System.out.println(i * j); System.out.println(" "); } System.out.println(" "); } } } C:\>cd JAVA C:\JAVA>javac Main2.java C:\JAVA>java Main2 Error: A JNI error has occurred, please check your installation and try again Exception in thread "main" java.lang.UnsupportedClassVersionError: Main2 has been compiled by a more recent version of the Java Runtime (class file version 58.0), 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) どうすればいいでしょうか？ ご多忙中恐れ入ります。 ご回答のほど、宜しくお願い申し上げます。
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