Module java.base
Package java.lang.runtime

# Class ObjectMethods

java.lang.Object
java.lang.runtime.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.

Since:
  16

## Method Summary

Modifier and Type
Method
Description
`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.

### Methods declared in class java.lang.Object

`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

## Method Details

### bootstrap

public static Object bootstrap(MethodHandles.Lookup lookup, String methodName, TypeDescriptor type, Class<?> recordClass, String names, MethodHandle... getters) throws Throwable
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` - 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` - the name of the method to generate, which must be one of `"equals"`, `"hashCode"`, or `"toString"`
  `type` - 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` - the record class hosting the record components
  `names` - the list of component names, joined into a string separated by ";", or the empty string if there are no components. This parameter is ignored if the `methodName` parameter is `"equals"` or `"hashCode"`
  `getters` - method handles for the accessor methods for the components
Returns:
  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
  `NullPointerException` - if any argument is `null` or if any element in the `getters` array is `null`
  `Throwable` - if any exception is thrown during call site construction