Uses of Class
java.lang.invoke.MethodHandle
-
Packages that use MethodHandle Package Description java.lang.invoke Thejava.lang.invokepackage contains dynamic language support provided directly by the Java core class libraries and virtual machine. -
-
Uses of MethodHandle in java.lang.invoke
Methods in java.lang.invoke that return MethodHandle Modifier and Type Method and Description static MethodHandleMethodHandles. arrayElementGetter(Class<?> arrayClass)Produces a method handle giving read access to elements of an array.static MethodHandleMethodHandles. arrayElementSetter(Class<?> arrayClass)Produces a method handle giving write access to elements of an array.MethodHandleMethodHandle. asCollector(Class<?> arrayType, int arrayLength)Makes an array-collecting method handle, which accepts a given number of trailing positional arguments and collects them into an array argument.MethodHandleMethodHandle. asFixedArity()Makes a fixed arity method handle which is otherwise equivalent to the current method handle.MethodHandleMethodHandle. asSpreader(Class<?> arrayType, int arrayLength)Makes an array-spreading method handle, which accepts a trailing array argument and spreads its elements as positional arguments.MethodHandleMethodHandle. asType(MethodType newType)Produces an adapter method handle which adapts the type of the current method handle to a new type.MethodHandleMethodHandle. asVarargsCollector(Class<?> arrayType)Makes a variable arity adapter which is able to accept any number of trailing positional arguments and collect them into an array argument.MethodHandleMethodHandles.Lookup. bind(Object receiver, String name, MethodType type)Produces an early-bound method handle for a non-static method.MethodHandleMethodHandle. bindTo(Object x)Binds a valuexto the first argument of a method handle, without invoking it.static MethodHandleMethodHandles. catchException(MethodHandle target, Class<? extends Throwable> exType, MethodHandle handler)Makes a method handle which adapts a target method handle, by running it inside an exception handler.static MethodHandleMethodHandles. collectArguments(MethodHandle target, int pos, MethodHandle filter)Adapts a target method handle by pre-processing a sub-sequence of its arguments with a filter (another method handle).static MethodHandleMethodHandles. constant(Class<?> type, Object value)Produces a method handle of the requested return type which returns the given constant value every time it is invoked.static MethodHandleMethodHandles. dropArguments(MethodHandle target, int pos, Class<?>... valueTypes)Produces a method handle which will discard some dummy arguments before calling some other specified target method handle.static MethodHandleMethodHandles. dropArguments(MethodHandle target, int pos, List<Class<?>> valueTypes)Produces a method handle which will discard some dummy arguments before calling some other specified target method handle.MethodHandleMutableCallSite. dynamicInvoker()Produces a method handle equivalent to an invokedynamic instruction which has been linked to this call site.MethodHandleConstantCallSite. dynamicInvoker()Returns this call site's permanent target.MethodHandleVolatileCallSite. dynamicInvoker()Produces a method handle equivalent to an invokedynamic instruction which has been linked to this call site.abstract MethodHandleCallSite. dynamicInvoker()Produces a method handle equivalent to an invokedynamic instruction which has been linked to this call site.static MethodHandleMethodHandles. exactInvoker(MethodType type)Produces a special invoker method handle which can be used to invoke any method handle of the given type, as if byinvokeExact.static MethodHandleMethodHandles. explicitCastArguments(MethodHandle target, MethodType newType)Produces a method handle which adapts the type of the given method handle to a new type by pairwise argument and return type conversion.static MethodHandleMethodHandles. filterArguments(MethodHandle target, int pos, MethodHandle... filters)Adapts a target method handle by pre-processing one or more of its arguments, each with its own unary filter function, and then calling the target with each pre-processed argument replaced by the result of its corresponding filter function.static MethodHandleMethodHandles. filterReturnValue(MethodHandle target, MethodHandle filter)Adapts a target method handle by post-processing its return value (if any) with a filter (another method handle).MethodHandleMethodHandles.Lookup. findConstructor(Class<?> refc, MethodType type)Produces a method handle which creates an object and initializes it, using the constructor of the specified type.MethodHandleMethodHandles.Lookup. findGetter(Class<?> refc, String name, Class<?> type)Produces a method handle giving read access to a non-static field.MethodHandleMethodHandles.Lookup. findSetter(Class<?> refc, String name, Class<?> type)Produces a method handle giving write access to a non-static field.MethodHandleMethodHandles.Lookup. findSpecial(Class<?> refc, String name, MethodType type, Class<?> specialCaller)Produces an early-bound method handle for a virtual method.MethodHandleMethodHandles.Lookup. findStatic(Class<?> refc, String name, MethodType type)Produces a method handle for a static method.MethodHandleMethodHandles.Lookup. findStaticGetter(Class<?> refc, String name, Class<?> type)Produces a method handle giving read access to a static field.MethodHandleMethodHandles.Lookup. findStaticSetter(Class<?> refc, String name, Class<?> type)Produces a method handle giving write access to a static field.MethodHandleMethodHandles.Lookup. findVirtual(Class<?> refc, String name, MethodType type)Produces a method handle for a virtual method.static MethodHandleMethodHandles. foldArguments(MethodHandle target, MethodHandle combiner)Adapts a target method handle by pre-processing some of its arguments, and then calling the target with the result of the pre-processing, inserted into the original sequence of arguments.MethodHandleMutableCallSite. getTarget()Returns the target method of the call site, which behaves like a normal field of theMutableCallSite.MethodHandleConstantCallSite. getTarget()Returns the target method of the call site, which behaves like afinalfield of theConstantCallSite.MethodHandleVolatileCallSite. getTarget()Returns the target method of the call site, which behaves like avolatilefield of theVolatileCallSite.abstract MethodHandleCallSite. getTarget()Returns the target method of the call site, according to the behavior defined by this call site's specific class.MethodHandleSwitchPoint. guardWithTest(MethodHandle target, MethodHandle fallback)Returns a method handle which always delegates either to the target or the fallback.static MethodHandleMethodHandles. guardWithTest(MethodHandle test, MethodHandle target, MethodHandle fallback)Makes a method handle which adapts a target method handle, by guarding it with a test, a boolean-valued method handle.static MethodHandleMethodHandles. identity(Class<?> type)Produces a method handle which returns its sole argument when invoked.static MethodHandleMethodHandles. insertArguments(MethodHandle target, int pos, Object... values)Provides a target method handle with one or more bound arguments in advance of the method handle's invocation.static MethodHandleMethodHandles. invoker(MethodType type)Produces a special invoker method handle which can be used to invoke any method handle compatible with the given type, as if byinvoke.static MethodHandleMethodHandles. permuteArguments(MethodHandle target, MethodType newType, int... reorder)Produces a method handle which adapts the calling sequence of the given method handle to a new type, by reordering the arguments.static MethodHandleMethodHandles. spreadInvoker(MethodType type, int leadingArgCount)Produces a method handle which will invoke any method handle of the giventype, with a given number of trailing arguments replaced by a single trailingObject[]array.static MethodHandleMethodHandles. throwException(Class<?> returnType, Class<? extends Throwable> exType)Produces a method handle which will throw exceptions of the givenexType.MethodHandleMethodHandles.Lookup. unreflect(Method m)Makes a direct method handle to m, if the lookup class has permission.MethodHandleMethodHandles.Lookup. unreflectConstructor(Constructor<?> c)Produces a method handle for a reflected constructor.MethodHandleMethodHandles.Lookup. unreflectGetter(Field f)Produces a method handle giving read access to a reflected field.MethodHandleMethodHandles.Lookup. unreflectSetter(Field f)Produces a method handle giving write access to a reflected field.MethodHandleMethodHandles.Lookup. unreflectSpecial(Method m, Class<?> specialCaller)Produces a method handle for a reflected method.static MethodHandleMethodHandleProxies. wrapperInstanceTarget(Object x)Produces or recovers a target method handle which is behaviorally equivalent to the unique method of this wrapper instance.Methods in java.lang.invoke with parameters of type MethodHandle Modifier and Type Method and Description static <T> TMethodHandleProxies. asInterfaceInstance(Class<T> intfc, MethodHandle target)Produces an instance of the given single-method interface which redirects its calls to the given method handle.static MethodHandleMethodHandles. catchException(MethodHandle target, Class<? extends Throwable> exType, MethodHandle handler)Makes a method handle which adapts a target method handle, by running it inside an exception handler.static MethodHandleMethodHandles. collectArguments(MethodHandle target, int pos, MethodHandle filter)Adapts a target method handle by pre-processing a sub-sequence of its arguments with a filter (another method handle).static MethodHandleMethodHandles. dropArguments(MethodHandle target, int pos, Class<?>... valueTypes)Produces a method handle which will discard some dummy arguments before calling some other specified target method handle.static MethodHandleMethodHandles. dropArguments(MethodHandle target, int pos, List<Class<?>> valueTypes)Produces a method handle which will discard some dummy arguments before calling some other specified target method handle.static MethodHandleMethodHandles. explicitCastArguments(MethodHandle target, MethodType newType)Produces a method handle which adapts the type of the given method handle to a new type by pairwise argument and return type conversion.static MethodHandleMethodHandles. filterArguments(MethodHandle target, int pos, MethodHandle... filters)Adapts a target method handle by pre-processing one or more of its arguments, each with its own unary filter function, and then calling the target with each pre-processed argument replaced by the result of its corresponding filter function.static MethodHandleMethodHandles. filterArguments(MethodHandle target, int pos, MethodHandle... filters)Adapts a target method handle by pre-processing one or more of its arguments, each with its own unary filter function, and then calling the target with each pre-processed argument replaced by the result of its corresponding filter function.static MethodHandleMethodHandles. filterReturnValue(MethodHandle target, MethodHandle filter)Adapts a target method handle by post-processing its return value (if any) with a filter (another method handle).static MethodHandleMethodHandles. foldArguments(MethodHandle target, MethodHandle combiner)Adapts a target method handle by pre-processing some of its arguments, and then calling the target with the result of the pre-processing, inserted into the original sequence of arguments.MethodHandleSwitchPoint. guardWithTest(MethodHandle target, MethodHandle fallback)Returns a method handle which always delegates either to the target or the fallback.static MethodHandleMethodHandles. guardWithTest(MethodHandle test, MethodHandle target, MethodHandle fallback)Makes a method handle which adapts a target method handle, by guarding it with a test, a boolean-valued method handle.static MethodHandleMethodHandles. insertArguments(MethodHandle target, int pos, Object... values)Provides a target method handle with one or more bound arguments in advance of the method handle's invocation.static CallSiteLambdaMetafactory. metafactory(MethodHandles.Lookup caller, String invokedName, MethodType invokedType, MethodType samMethodType, MethodHandle implMethod, MethodType instantiatedMethodType)Facilitates the creation of simple "function objects" that implement one or more interfaces by delegation to a providedMethodHandle, after appropriate type adaptation and partial evaluation of arguments.static MethodHandleMethodHandles. permuteArguments(MethodHandle target, MethodType newType, int... reorder)Produces a method handle which adapts the calling sequence of the given method handle to a new type, by reordering the arguments.static <T extends Member>
TMethodHandles. reflectAs(Class<T> expected, MethodHandle target)Performs an unchecked "crack" of a direct method handle.MethodHandleInfoMethodHandles.Lookup. revealDirect(MethodHandle target)Cracks a direct method handle created by this lookup object or a similar one.voidMutableCallSite. setTarget(MethodHandle newTarget)Updates the target method of this call site, as a normal variable.voidConstantCallSite. setTarget(MethodHandle ignore)Always throws anUnsupportedOperationException.voidVolatileCallSite. setTarget(MethodHandle newTarget)Updates the target method of this call site, as a volatile variable.abstract voidCallSite. setTarget(MethodHandle newTarget)Updates the target method of this call site, according to the behavior defined by this call site's specific class.Constructors in java.lang.invoke with parameters of type MethodHandle Constructor and Description ConstantCallSite(MethodHandle target)Creates a call site with a permanent target.ConstantCallSite(MethodType targetType, MethodHandle createTargetHook)Creates a call site with a permanent target, possibly bound to the call site itself.MutableCallSite(MethodHandle target)Creates a call site object with an initial target method handle.VolatileCallSite(MethodHandle target)Creates a call site with a volatile binding to its target.
-
Submit a bug or feature
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
Copyright © 1993, 2022, Oracle and/or its affiliates. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.
