# Interface DoubleEntry

All Superinterfaces:
  `AnnotationConstantValueEntry, ConstantValueEntry, LoadableConstantEntry, PoolEntry`

public sealed interface DoubleEntry extends AnnotationConstantValueEntry, ConstantValueEntry
Models a `CONSTANT_Double_info` structure, representing a `double` constant, in the constant pool of a `class` file.

The use of a `DoubleEntry` is modeled by a `double`. Conversions are through `ConstantPoolBuilder.doubleEntry(double)` and `doubleValue()`. In the conversions, all NaN values of the `double` may or may not be collapsed into a single "canonical" NaN value.

A double entry has a width of `2`, making its subsequent constant pool index valid and unusable.

See Java Virtual Machine Specification:
  4.4.5 The `CONSTANT_Long_info` and `CONSTANT_Double_info` Structures
Since:
  24
See Also:
  - `ConstantPoolBuilder::doubleEntry`

## Field Summary

### Fields declared in interface PoolEntry

`TAG_CLASS, TAG_DOUBLE, TAG_DYNAMIC, TAG_FIELDREF, TAG_FLOAT, TAG_INTEGER, TAG_INTERFACE_METHODREF, TAG_INVOKE_DYNAMIC, TAG_LONG, TAG_METHOD_HANDLE, TAG_METHOD_TYPE, TAG_METHODREF, TAG_MODULE, TAG_NAME_AND_TYPE, TAG_PACKAGE, TAG_STRING, TAG_UTF8`

## Method Summary

Modifier and Type
Method
Description
`double`
`doubleValue()`
Returns the `double` value.

### Methods declared in interface AnnotationConstantValueEntry

`constantValue`

### Methods declared in interface ConstantValueEntry

`constantValue`

### Methods declared in interface LoadableConstantEntry

`typeKind`

### Methods declared in interface PoolEntry

`constantPool, index, tag, width`

## Method Details

### doubleValue

double doubleValue()
Returns the `double` value.

Returns:
  the `double` value
See Also:
  - `ConstantPoolBuilder::doubleEntry(double)`