java中的invoke方法_详解Java中Method的Invoke方法

throws IllegalAccessException, IllegalArgumentException,InvocationTargetException{if (!override) {if (!heckMemberAccess(clazz, modifiers)) {Class caller = lerClass(1);Class targetClass = ((obj == null || !ected(modifiers)) clazz: ss());boolean cached;synchronized (this) {cached = (securityCheckCache == caller)&& (securityCheckTargetClassCache == targetClass);}if (!cached) {MemberAccess(caller, clazz, obj, modifiers);synchronized (this) {securityCheckCache = caller;securityCheckTargetClassCache = targetClass;}}}}if (methodAccessor == null) acquireMethodAccessor();return (obj, args);}// NOTE that there is no synchronization used here. It is correct// (though not efficient) to generate more than one MethodAccessor// for a given Method. However, avoiding synchronization will// probably make the implementation more e void acquireMethodAccessor() {// First check to see if one has been created yet, and take it// if soMethodAccessor tmp = null;

// startup time for certain applications that use reflection// intensively (but only once per class) to bootstrap themselves.// To avoid this penalty we reuse the existing JVM entry points// for the first few invocations of Methods and Constructors and// then switch to the bytecode-based implementations.//// Package-private to be accessible to NativeMethodAccessorImpl// and NativeConstructorAccessorImplprivate static boolean noInflation = false;private static int inflationThreshold = 15;// .../** We have to defer full initialization of this class until afterthe static initializer is run since 'sstatic initializer (more properly, that ibleObject) causes this class's to berun, before the system properties are set up. */private static void checkInitted() {if (initted) return;ileged(new PrivilegedAction() {public Object run() {// Tests to ensure the system properties table is fully// initialized. This is needed because reflection code is// called very early in the initialization process (before// command-line arguments have been parsed and therefore// these user-settable properties installed.) We assume that// if is non-null then the System class has been// fully initialized and that the bulk of the startup code// has been ( == null) {// not yet fully initializedreturn null;}String val = perty("ation");if (val != null && ("true")) {

noInflation = true;}val = perty("ionThreshold");if (val != null) {try {inflationThreshold = nt(val);} catch (NumberFormatException e) {throw (RuntimeException)new RuntimeException("Unable to parse property ionThreshold").initCause(e);}}initted = true;return null;}});}// ...public MethodAccessor newMethodAccessor(Method method) {checkInitted();if (noInflation) {return new MethodAccessorGenerator().generateMethod(laringClass(),e(),ameterTypes(),urnType(),eptionTypes(),ifiers());} else {NativeMethodAccessorImpl acc =new NativeMethodAccessorImpl(method);DelegatingMethodAccessorImpl res =new DelegatingMethodAccessorImpl(acc);ent(res);