ObjectMethods

public class ObjectMethods
extends Object

java.lang.Object
↳	java.lang.runtime.ObjectMethods

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

From class


        
          java.lang.Object

`Object`	`clone()` Creates and returns a copy of this object.
`boolean`	`equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void`	`finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>`	`getClass()` Returns the runtime class of this `Object`.
`int`	`hashCode()` Returns a hash code value for the object.
`final void`	`notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void`	`notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String`	`toString()` Returns a string representation of the object.
`final void`	`wait(long timeoutMillis, int nanos)` Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
`final void`	`wait(long timeoutMillis)` Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
`final void`	`wait()` Causes the current thread to wait until it is awakened, typically by being notified or interrupted.

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 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

Throws
`IllegalArgumentException`	if the bootstrap arguments are invalid or inconsistent
`Throwable`	if any exception is thrown during call site construction