?? enumconstants.java
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import java.util.Arrays;import static java.lang.System.out;enum Eon { HADEAN, ARCHAEAN, PROTEROZOIC, PHANEROZOIC }public class EnumConstants { public static void main(String... args) { try { Class<?> c = (args.length == 0 ? Eon.class : Class.forName(args[0])); out.format("Enum name: %s%nEnum constants: %s%n", c.getName(), Arrays.asList(c.getEnumConstants())); if (c == Eon.class) out.format(" Eon.values(): %s%n", Arrays.asList(Eon.values())); // production code should handle this exception more gracefully } catch (ClassNotFoundException x) { x.printStackTrace(); } }}?? 快捷鍵說明
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