Class ObjectMethods

java.lang.Object
java.lang.runtime.ObjectMethods
public classObjectMethodsextendsObject
Bootstrap methods for state-driven implementations of core methods, includingObject.equals(Object),Object.hashCode(), andObject.toString(). These methods may be used, for example, by Java compiler implementations to implement the bodies ofObject methods for record classes.
Since:
16

  • Method Details

    • bootstrap

      public static Object bootstrap(MethodHandles.Lookup lookup,String methodName,TypeDescriptor type,Class<?> recordClass,String names,MethodHandle... getters) throwsThrowable
      Bootstrap method to generate theObject.equals(Object),Object.hashCode(), andObject.toString() methods, based on a description of the component names and accessor methods, for eitherinvokedynamic call sites or dynamic constant pool entries. For more detail on the semantics of the generated methods see the specification ofRecord.equals(Object),Record.hashCode() andRecord.toString().
      Parameters:
      lookup - Every bootstrap method is expected to have alookup which usually represents a lookup context with the accessibility privileges of the caller. This is becauseinvokedynamic call sites always provide alookup to the corresponding bootstrap method, but this method just ignores thelookup parameter
      methodName - the name of the method to generate, which must be one of"equals","hashCode", or"toString"
      type - aMethodType corresponding the descriptor type for the method, which must correspond to the descriptor for the correspondingObject method, if linking aninvokedynamic call site, or the constantMethodHandle.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 themethodName 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 isnull or if any element in thegetters array isnull
      Throwable - if any exception is thrown during call site construction