# TypeDescriptor.OfMethod Added in[API level 34](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) # OfMethod ``` interface OfMethod!, M : TypeDescriptor.OfMethod!> : TypeDescriptor ``` |--------------------------------------------------------------------------------------------------------------------------------------| | [java.lang.invoke.TypeDescriptor.OfMethod](https://developer.android.com/reference/kotlin/java/lang/invoke/TypeDescriptor.OfMethod#) | |----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | Known Direct Subclasses [MethodType](https://developer.android.com/reference/kotlin/java/lang/invoke/MethodType) |------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | [MethodType](https://developer.android.com/reference/kotlin/java/lang/invoke/MethodType) | A method type represents the arguments and return type accepted and returned by a method handle, or the arguments and return type passed and expected by a method handle caller. | | An entity that has a method type descriptor Method descriptors conforming to JVMS {@jvms 4.3.3} can be described ## Summary | Public methods || |-----------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | abstractM | [changeParameterType](https://developer.android.com/reference/kotlin/java/lang/invoke/TypeDescriptor.OfMethod#changeParameterType(kotlin.Int,%20java.lang.invoke.TypeDescriptor.OfMethod.F))`(`index:` `[Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)`, `paramType:` `F`)` Return a method descriptor that is identical to this one, except that a single parameter type has been changed to the specified type. | | abstractM | [changeReturnType](https://developer.android.com/reference/kotlin/java/lang/invoke/TypeDescriptor.OfMethod#changeReturnType(java.lang.invoke.TypeDescriptor.OfMethod.F))`(`newReturn:` `F`)` Return a method descriptor that is identical to this one, except that the return type has been changed to the specified type | | abstractM | [dropParameterTypes](https://developer.android.com/reference/kotlin/java/lang/invoke/TypeDescriptor.OfMethod#dropParameterTypes(kotlin.Int,%20kotlin.Int))`(`start:` `[Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)`, `end:` `[Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)`)` Return a method descriptor that is identical to this one, except that a range of parameter types have been removed. | | abstractM | [insertParameterTypes](https://developer.android.com/reference/kotlin/java/lang/invoke/TypeDescriptor.OfMethod#insertParameterTypes(kotlin.Int,%20java.lang.invoke.TypeDescriptor.OfMethod.F))`(`pos:` `[Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)`, `vararg` `paramTypes:` `F`)` Return a method descriptor that is identical to this one, except that a range of additional parameter types have been inserted. | | abstract[Array](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-array/index.html)\! | [parameterArray](https://developer.android.com/reference/kotlin/java/lang/invoke/TypeDescriptor.OfMethod#parameterArray())`()` Return an array of field descriptors for the parameter types of the method type described by this descriptor | | abstract[Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | [parameterCount](https://developer.android.com/reference/kotlin/java/lang/invoke/TypeDescriptor.OfMethod#parameterCount())`()` Return the number of parameters in the method type | | abstract[MutableList](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/-mutable-list/index.html)\! | [parameterList](https://developer.android.com/reference/kotlin/java/lang/invoke/TypeDescriptor.OfMethod#parameterList())`()` Return an immutable list of field descriptors for the parameter types of the method type described by this descriptor | | abstractF | [parameterType](https://developer.android.com/reference/kotlin/java/lang/invoke/TypeDescriptor.OfMethod#parameterType(kotlin.Int))`(`i:` `[Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)`)` Return a field descriptor describing the requested parameter of the method type described by this descriptor | | abstractF | [returnType](https://developer.android.com/reference/kotlin/java/lang/invoke/TypeDescriptor.OfMethod#returnType())`()` Return a field descriptor describing the return type of the method type described by this descriptor | | Inherited functions || |---|---| | From class[TypeDescriptor](https://developer.android.com/reference/kotlin/java/lang/invoke/TypeDescriptor) |-----------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | [String](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html)! | [descriptorString](https://developer.android.com/reference/kotlin/java/lang/invoke/TypeDescriptor#descriptorString())`()`
Returns the descriptor string for this`TypeDescriptor`object. If this`TypeDescriptor`object can be described in nominal form, then this method returns a type descriptor as specified in JVMS {@jvms 4.3}. The result descriptor string can be used to produce a`java.lang.constant.ConstantDesc nominal descriptor`. Otherwise, the result string is not a type descriptor. No`java.lang.constant.ConstantDesc nominal descriptor`can be produced from the result string.
| || ## Public methods ### changeParameterType Added in[API level 34](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` abstract fun changeParameterType(     index: Int,     paramType: F ): M ``` Return a method descriptor that is identical to this one, except that a single parameter type has been changed to the specified type. | Parameters || |-------------|-----------------------------------------------------------------------------------------------------------------| | `index` | [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html):the index of the parameter to change | | `paramType` | F:a field descriptor describing the new parameter type | | Return || |---|---------------------------| | M | the new method descriptor | | Exceptions || |---------------------------------------|--------------------------------------------------------------------| | `java.lang.NullPointerException` | if any argument is`null` | | `java.lang.IndexOutOfBoundsException` | if the index is outside the half-open range {\[0, parameterCount)} | ### changeReturnType Added in[API level 34](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` abstract fun changeReturnType(newReturn: F): M ``` Return a method descriptor that is identical to this one, except that the return type has been changed to the specified type | Parameters || |-------------|----------------------------------------------| | `newReturn` | F:a field descriptor for the new return type | | Return || |---|---------------------------| | M | the new method descriptor | | Exceptions || |----------------------------------|--------------------------| | `java.lang.NullPointerException` | if any argument is`null` | ### dropParameterTypes Added in[API level 34](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` abstract fun dropParameterTypes(     start: Int,     end: Int ): M ``` Return a method descriptor that is identical to this one, except that a range of parameter types have been removed. | Parameters || |---------|-------------------------------------------------------------------------------------------------------------------------| | `start` | [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html):the index of the first parameter to remove | | `end` | [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html):the index after the last parameter to remove | | Return || |---|---------------------------| | M | the new method descriptor | | Exceptions || |---------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------| | `java.lang.IndexOutOfBoundsException` | if`start`is outside the half-open range`[0, parameterCount)`, or`end`is outside the closed range`[0, parameterCount]`, or if`start > end` | ### insertParameterTypes Added in[API level 34](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` abstract fun insertParameterTypes(     pos: Int,     vararg paramTypes: F ): M ``` Return a method descriptor that is identical to this one, except that a range of additional parameter types have been inserted. | Parameters || |--------------|--------------------------------------------------------------------------------------------------------------------------------------| | `pos` | [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html):the index at which to insert the first inserted parameter | | `paramTypes` | F:field descriptors describing the new parameter types to insert | | Return || |---|---------------------------| | M | the new method descriptor | | Exceptions || |---------------------------------------|------------------------------------------------------------| | `java.lang.NullPointerException` | if any argument is`null` | | `java.lang.IndexOutOfBoundsException` | if`pos`is outside the closed range {\[0, parameterCount\]} | ### parameterArray Added in[API level 34](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` abstract fun parameterArray(): Array! ``` Return an array of field descriptors for the parameter types of the method type described by this descriptor | Return || |------------------------------------------------------------------------------------|-------------------------------------------| | [Array](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-array/index.html)! | field descriptors for the parameter types | ### parameterCount Added in[API level 34](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` abstract fun parameterCount(): Int ``` Return the number of parameters in the method type | Return || |----------------------------------------------------------------------------|--------------------------| | [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | the number of parameters | ### parameterList Added in[API level 34](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` abstract fun parameterList(): MutableList! ``` Return an immutable list of field descriptors for the parameter types of the method type described by this descriptor | Return || |-------------------------------------------------------------------------------------------------------------|-------------------------------------------| | [MutableList](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/-mutable-list/index.html)! | field descriptors for the parameter types | ### parameterType Added in[API level 34](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` abstract fun parameterType(i: Int): F ``` Return a field descriptor describing the requested parameter of the method type described by this descriptor | Parameters || |-----|-------------------------------------------------------------------------------------------------------| | `i` | [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html):the index of the parameter | | Return || |---|-----------------------------------------------------| | F | a field descriptor for the requested parameter type | | Exceptions || |---------------------------------------|--------------------------------------------------------------------| | `java.lang.IndexOutOfBoundsException` | if the index is outside the half-open range {\[0, parameterCount)} | ### returnType Added in[API level 34](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` abstract fun returnType(): F ``` Return a field descriptor describing the return type of the method type described by this descriptor | Return || |---|----------------------------------------| | F | a field descriptor for the return type |