Added in API level 34
Summary: Methods | Inherited Methods

ObjectMethods

public class ObjectMethods
extends Object


Bootstrap methods for state-driven implementations of core methods, including Object.equals(Object), Object.hashCode(), and Object.toString(). These methods may be used, for example, by Java compiler implementations to implement the bodies of Object methods for record classes.

Summary

Public methods

static Object bootstrap(MethodHandles.Lookup lookup, String methodName, TypeDescriptor type, Class<?> recordClass, String names, MethodHandle... getters)

Bootstrap method to generate the Object.equals(Object), Object.hashCode(), and Object.toString() methods, based on a description of the component names and accessor methods, for either invokedynamic call sites or dynamic constant pool entries.

Inherited methods

Public methods

bootstrap

Added in API level 34 
public static Object bootstrap (MethodHandles.Lookup lookup, 
                String methodName, 
                TypeDescriptor type, 
                Class<?> recordClass, 
                String names, 
                MethodHandle... getters)

Bootstrap method to generate the Object.equals(Object), Object.hashCode(), and Object.toString() methods, based on a description of the component names and accessor methods, for either invokedynamic call sites or dynamic constant pool entries. For more detail on the semantics of the generated methods see the specification of java.lang.Record.equals(Object), Record.hashCode() and Record.toString().

Parameters
lookup MethodHandles.Lookup: Every bootstrap method is expected to have a lookup which usually represents a lookup context with the accessibility privileges of the caller. This is because invokedynamic call sites always provide a lookup to the corresponding bootstrap method, but this method just ignores the lookup parameter
methodName String: the name of the method to generate, which must be one of "equals", "hashCode", or "toString"
type TypeDescriptor: a MethodType corresponding the descriptor type for the method, which must correspond to the descriptor for the corresponding Object method, if linking an invokedynamic call site, or the constant MethodHandle.class, if linking a dynamic constant
recordClass Class: the record class hosting the record components
names String: the list of component names, joined into a string separated by ";", or the empty string if there are no components. Maybe be null, if the methodName is "equals" or "hashCode".
getters MethodHandle: method handles for the accessor methods for the components
Returns
Object a call site if invoked by indy, or a method handle if invoked by a condy