Java的Modifier

class的getModifiers()方法能获取类的修饰信息。

    /*** The {@code int} value representing the {@code public}* modifier.*/public static final int PUBLIC           = 0x00000001;/*** The {@code int} value representing the {@code private}* modifier.*/public static final int PRIVATE          = 0x00000002;/*** The {@code int} value representing the {@code protected}* modifier.*/public static final int PROTECTED        = 0x00000004;/*** The {@code int} value representing the {@code static}* modifier.*/public static final int STATIC           = 0x00000008;/*** The {@code int} value representing the {@code final}* modifier.*/public static final int FINAL            = 0x00000010;/*** The {@code int} value representing the {@code synchronized}* modifier.*/public static final int SYNCHRONIZED     = 0x00000020;/*** The {@code int} value representing the {@code volatile}* modifier.*/public static final int VOLATILE         = 0x00000040;/*** The {@code int} value representing the {@code transient}* modifier.*/public static final int TRANSIENT        = 0x00000080;/*** The {@code int} value representing the {@code native}* modifier.*/public static final int NATIVE           = 0x00000100;/*** The {@code int} value representing the {@code interface}* modifier.*/public static final int INTERFACE        = 0x00000200;/*** The {@code int} value representing the {@code abstract}* modifier.*/public static final int ABSTRACT         = 0x00000400;/*** The {@code int} value representing the {@code strictfp}* modifier.*/public static final int STRICT           = 0x00000800;// Bits not (yet) exposed in the public API either because they// have different meanings for fields and methods and there is no// way to distinguish between the two in this class, or because// they are not Java programming language keywordsstatic final int BRIDGE    = 0x00000040;static final int VARARGS   = 0x00000080;static final int SYNTHETIC = 0x00001000;static final int ANNOTATION  = 0x00002000;static final int ENUM      = 0x00004000;static final int MANDATED  = 0x00008000;

Constructor中应用getModifiers()来判断类是否是枚举。

    @CallerSensitive@ForceInline // to ensure Reflection.getCallerClass optimizationpublic T newInstance(Object ... initargs)throws InstantiationException, IllegalAccessException,IllegalArgumentException, InvocationTargetException{if (!override) {Class<?> caller = Reflection.getCallerClass();checkAccess(caller, clazz, clazz, modifiers);}if ((clazz.getModifiers() & Modifier.ENUM) != 0)throw new IllegalArgumentException("Cannot reflectively create enum objects");ConstructorAccessor ca = constructorAccessor;   // read volatileif (ca == null) {ca = acquireConstructorAccessor();}@SuppressWarnings("unchecked")T inst = (T) ca.newInstance(initargs);return inst;}

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