VariableElement (Java Platform SE 6) - JDK 5 Documentation v6.0, Java 2 SDK 英文文档

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Java™ Platform
Standard Ed. 6

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javax.lang.model.element
Interface VariableElement

All Superinterfaces:: Element

public interface VariableElement
extends Element
extends Element

Represents a field, enum constant, method or constructor parameter, local variable, or exception parameter.

Since:: 1.6

Method Summary

Object getConstantValue()
Returns the value of this variable if this is a final field initialized to a compile-time constant.

Methods inherited from interface javax.lang.model.element.Element

accept, asType, equals, getAnnotation, getAnnotationMirrors, getEnclosedElements, getEnclosingElement, getKind, getModifiers, getSimpleName, hashCode

Method Summary
`Object`	`getConstantValue()` Returns the value of this variable if this is a `final` field initialized to a compile-time constant.

Methods inherited from interface javax.lang.model.element.Element
`accept, asType, equals, getAnnotation, getAnnotationMirrors, getEnclosedElements, getEnclosingElement, getKind, getModifiers, getSimpleName, hashCode`

Method Detail

getConstantValue

Object getConstantValue()

Returns the value of this variable if this is a final field initialized to a compile-time constant. Returns null otherwise. The value will be of a primitive type or a String. If the value is of a primitive type, it is wrapped in the appropriate wrapper class (such as Integer).

Note that not all final fields will have constant values. In particular, enum constants are not considered to be compile-time constants. To have a constant value, a field's type must be either a primitive type or String.

Returns:: the value of this variable if this is a final field initialized to a compile-time constant, or null otherwise
See Also:: Elements.getConstantExpression(Object)
See The Java Language Specification, Third Edition:: 15.28 Constant Expression, 4.12.4 final Variables