# Uses of Interface
java.lang.instrument.ClassFileTransformer

Packages that use ClassFileTransformer
Package | Description
--- | ---
java.lang.instrument | Provides services that allow Java programming language agents to instrument programs running on the JVM.

## Uses of ClassFileTransformer in java.lang.instrument

Methods in java.lang.instrument with parameters of type ClassFileTransformer
Modifier and Type | Method | Description
--- | --- | ---
`void` | Instrumentation.`addTransformer​(ClassFileTransformer transformer)` | Registers the supplied transformer.
`void` | Instrumentation.`addTransformer​(ClassFileTransformer transformer, boolean canRetransform)` | Registers the supplied transformer.
`boolean` | Instrumentation.`removeTransformer​(ClassFileTransformer transformer)` | Unregisters the supplied transformer.
`void` | Instrumentation.`setNativeMethodPrefix​(ClassFileTransformer transformer, String prefix)` | This method modifies the failure handling of native method resolution by allowing retry with a prefix applied to the name.