当前页面: 在线文档首页 > JDK 5 Documentation v6.0, Java 2 SDK 英文文档

Field (Java Debug Interface) - JDK 5 Documentation v6.0, Java 2 SDK 英文文档

---

Overview  Package   Class  Use  Tree  Index  Help		Java Debug Interface
PREV CLASS   NEXT CLASS	FRAMES    NO FRAMES
SUMMARY: NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

---

com.sun.jdi
Interface Field

All Superinterfaces:

Accessible, Comparable<Field>, Mirror, TypeComponent

---

public interface Field
extends TypeComponent, Comparable<Field>

A class or instance variable in the target VM. See TypeComponent for general information about Field and Method mirrors.

Since:

1.3

See Also:

ObjectReference, ReferenceType

---

Method Summary
boolean	equals(Object obj)           Compares the specified Object with this field for equality.
int	hashCode()           Returns the hash code value for this Field.
boolean	isEnumConstant()           Determine if this is a field that represents an enum constant.
boolean	isTransient()           Determine if this is a transient field.
boolean	isVolatile()           Determine if this is a volatile field.
Type	type()           Returns the type of this field.
String	typeName()           Returns a text representation of the type of this field.

 

Methods inherited from interface com.sun.jdi.TypeComponent
declaringType, genericSignature, isFinal, isStatic, isSynthetic, name, signature

 

Methods inherited from interface com.sun.jdi.Mirror
toString, virtualMachine

 

Methods inherited from interface com.sun.jdi.Accessible
isPackagePrivate, isPrivate, isProtected, isPublic, modifiers

 

Methods inherited from interface java.lang.Comparable
compareTo

 

Method Detail

typeName

String typeName()

Returns a text representation of the type of this field. Where the type is the type specified in the declaration of this field.

This type name is always available even if the type has not yet been created or loaded.

Returns:

a String representing the type of this field.

---

type

Type type()
          throws ClassNotLoadedException

Returns the type of this field. Where the type is the type specified in the declaration of this field.

For example, if a target class defines:

    short s;
    Date d;
    byte[] ba;

And the JDI client defines these Field objects:

    Field sField = targetClass.fieldByName("s");
    Field dField = targetClass.fieldByName("d");
    Field baField = targetClass.fieldByName("ba");

to mirror the corresponding fields, then sField.type() is a ShortType, dField.type() is the ReferenceType for java.util.Date and ((ArrayType)(baField.type())).componentType() is a ByteType.

Note: if the type of this field is a reference type (class, interface, or array) and it has not been created or loaded by the declaring type's class loader - that is, declaringType() .classLoader(), then ClassNotLoadedException will be thrown. Also, a reference type may have been loaded but not yet prepared, in which case the type will be returned but attempts to perform some operations on the returned type (e.g. fields()) will throw a ClassNotPreparedException. Use ReferenceType.isPrepared() to determine if a reference type is prepared.

Returns:

the Type of this field.

Throws:

ClassNotLoadedException - if the type has not yet been loaded or created through the appropriate class loader.

See Also:

Type

---

isTransient

boolean isTransient()

Determine if this is a transient field.

Returns:

true if this field is transient; false otherwise.

---

isVolatile

boolean isVolatile()

Determine if this is a volatile field.

Returns:

true if this field is volatile; false otherwise.

---

isEnumConstant

boolean isEnumConstant()

Determine if this is a field that represents an enum constant.

Returns:

true if this field represents an enum constant; false otherwise.

---

equals

boolean equals(Object obj)

Compares the specified Object with this field for equality.

Overrides:

equals in class Object

Returns:

true if the Object is a Field and if both mirror the same field (declared in the same class or interface, in the same VM).

---

hashCode

int hashCode()

Returns the hash code value for this Field.

Overrides:

hashCode in class Object

Returns:

the integer hash code

---

Overview  Package   Class  Use  Tree  Index  Help		Java Debug Interface
PREV CLASS   NEXT CLASS	FRAMES    NO FRAMES
SUMMARY: NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

---