public class ObjectMethods extends Object
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.Modifier and Type | Method | Description |
---|---|---|
static Object |
bootstrap |
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. |
public static Object bootstrap(MethodHandles.Lookup lookup, String methodName, TypeDescriptor type, Class<?> recordClass, String names, MethodHandle... getters) throws Throwable
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()
.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
parametermethodName
- 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 constantrecordClass
- the record class hosting the record componentsnames
- 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 componentsIllegalArgumentException
- if the bootstrap arguments are invalid or inconsistentNullPointerException
- 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
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https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/runtime/ObjectMethods.html