Field

AI-generated Key Takeaways

• The Field class provides information about and dynamic access to a single field of a class or interface during runtime.

• It enables getting and setting field values, retrieving field metadata (name, type, modifiers), and working with annotations.

• Field supports type handling, including widening conversions, but throws exceptions for narrowing conversions or incorrect types.

• Access control rules are enforced, requiring setAccessible(true) to bypass restrictions for private fields.

• Common exceptions like IllegalAccessException, IllegalArgumentException, and NullPointerException may occur during field access or modification.

public final class Field extends AccessibleObject
implements Member

A Field provides information about, and dynamic access to, a single field of a class or an interface. The reflected field may be a class (static) field or an instance field.

A Field permits widening conversions to occur during a get or set access operation, but throws an IllegalArgumentException if a narrowing conversion would occur.

See Also

• Member
• Class
• Class.getFields()
• Class.getField(String)
• Class.getDeclaredFields()
• Class.getDeclaredField(String)

Inherited Constant Summary

From interface java.lang.reflect.Member

int	DECLARED	Identifies the set of declared members of a class or interface.
int	PUBLIC	Identifies the set of all public members of a class or interface, including inherited members.

Public Method Summary

boolean	equals(Object obj) Compares this Field against the specified object.
Object	get(Object obj) Returns the value of the field represented by this Field, on the specified object.
<T extends Annotation> T	getAnnotation(Class<T> annotationClass) Returns this element's annotation for the specified type if such an annotation is present, else null.
<T extends Annotation> T[]	getAnnotationsByType(Class<T> annotationClass) Returns annotations that are associated with this element.
boolean	getBoolean(Object obj) Gets the value of a static or instance boolean field.
byte	getByte(Object obj) Gets the value of a static or instance byte field.
char	getChar(Object obj) Gets the value of a static or instance field of type char or of another primitive type convertible to type char via a widening conversion.
Annotation[]	getDeclaredAnnotations() Returns annotations that are directly present on this element.
Class<?>	getDeclaringClass() Returns the Class object representing the class or interface that declares the field represented by this Field object.
double	getDouble(Object obj) Gets the value of a static or instance field of type double or of another primitive type convertible to type double via a widening conversion.
float	getFloat(Object obj) Gets the value of a static or instance field of type float or of another primitive type convertible to type float via a widening conversion.
Type	getGenericType() Returns a Type object that represents the declared type for the field represented by this Field object.
int	getInt(Object obj) Gets the value of a static or instance field of type int or of another primitive type convertible to type int via a widening conversion.
long	getLong(Object obj) Gets the value of a static or instance field of type long or of another primitive type convertible to type long via a widening conversion.
int	getModifiers() Returns the Java language modifiers for the field represented by this Field object, as an integer.
String	getName() Returns the name of the field represented by this Field object.
short	getShort(Object obj) Gets the value of a static or instance field of type short or of another primitive type convertible to type short via a widening conversion.
Class<?>	getType() Returns a Class object that identifies the declared type for the field represented by this Field object.
int	hashCode() Returns a hashcode for this Field.
boolean	isAnnotationPresent(Class<? extends Annotation> annotationType) Returns true if an annotation for the specified type is present on this element, else false.
boolean	isEnumConstant() Returns true if this field represents an element of an enumerated type; returns false otherwise.
boolean	isSynthetic() Returns true if this field is a synthetic field; returns false otherwise.
void	set(Object obj, Object value) Sets the field represented by this Field object on the specified object argument to the specified new value.
void	setBoolean(Object obj, boolean b) Sets the value of a field as a boolean on the specified object.
void	setByte(Object obj, byte b) Sets the value of a field as a byte on the specified object.
void	setChar(Object obj, char c) Sets the value of a field as a char on the specified object.
void	setDouble(Object obj, double d) Sets the value of a field as a double on the specified object.
void	setFloat(Object obj, float f) Sets the value of a field as a float on the specified object.
void	setInt(Object obj, int i) Sets the value of a field as an int on the specified object.
void	setLong(Object obj, long l) Sets the value of a field as a long on the specified object.
void	setShort(Object obj, short s) Sets the value of a field as a short on the specified object.
String	toGenericString() Returns a string describing this Field, including its generic type.
String	toString() Returns a string describing this Field.

Inherited Method Summary

From class java.lang.reflect.AccessibleObject

<T extends Annotation> T	getAnnotation(Class<T> annotationClass) Returns this element's annotation for the specified type if such an annotation is present, else null.
Annotation[]	getAnnotations() Returns annotations that are present on this element.
<T extends Annotation> T[]	getAnnotationsByType(Class<T> annotationClass) Returns annotations that are associated with this element.
<T extends Annotation> T	getDeclaredAnnotation(Class<T> annotationClass) Returns this element's annotation for the specified type if such an annotation is directly present, else null.
Annotation[]	getDeclaredAnnotations() Returns annotations that are directly present on this element.
<T extends Annotation> T[]	getDeclaredAnnotationsByType(Class<T> annotationClass) Returns this element's annotation(s) for the specified type if such annotations are either directly present or indirectly present.
boolean	isAccessible() Get the value of the accessible flag for this object.
boolean	isAnnotationPresent(Class<? extends Annotation> annotationClass) Returns true if an annotation for the specified type is present on this element, else false.
void	setAccessible(boolean flag) Set the accessible flag for this object to the indicated boolean value.
static void	setAccessible(AccessibleObject[] array, boolean flag) Convenience method to set the accessible flag for an array of objects with a single security check (for efficiency).

From class java.lang.Object

Object	clone() Creates and returns a copy of this Object.
boolean	equals(Object obj) Compares this instance with the specified object and indicates if they are equal.
void	finalize() Invoked when the garbage collector has detected that this instance is no longer reachable.
final Class<?>	getClass() Returns the unique instance of Class that represents this object's class.
int	hashCode() Returns an integer hash code for this object.
final void	notify() Causes a thread which is waiting on this object's monitor (by means of calling one of the wait() methods) to be woken up.
final void	notifyAll() Causes all threads which are waiting on this object's monitor (by means of calling one of the wait() methods) to be woken up.
String	toString() Returns a string containing a concise, human-readable description of this object.
final void	wait(long timeout, int nanos) Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object or until the specified timeout expires.
final void	wait(long timeout) Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object or until the specified timeout expires.
final void	wait() Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object.

From interface java.lang.reflect.AnnotatedElement

abstract <T extends Annotation> T	getAnnotation(Class<T> annotationClass) Returns this element's annotation for the specified type if such an annotation is present, else null.
abstract Annotation[]	getAnnotations() Returns annotations that are present on this element.
<T extends Annotation> T[]	getAnnotationsByType(Class<T> annotationClass) Returns annotations that are associated with this element.
<T extends Annotation> T	getDeclaredAnnotation(Class<T> annotationClass) Returns this element's annotation for the specified type if such an annotation is directly present, else null.
abstract Annotation[]	getDeclaredAnnotations() Returns annotations that are directly present on this element.
<T extends Annotation> T[]	getDeclaredAnnotationsByType(Class<T> annotationClass) Returns this element's annotation(s) for the specified type if such annotations are either directly present or indirectly present.
boolean	isAnnotationPresent(Class<? extends Annotation> annotationClass) Returns true if an annotation for the specified type is present on this element, else false.

From interface java.lang.reflect.Member

abstract Class<?>	getDeclaringClass() Returns the Class object representing the class or interface that declares the member or constructor represented by this Member.
abstract int	getModifiers() Returns the Java language modifiers for the member or constructor represented by this Member, as an integer.
abstract String	getName() Returns the simple name of the underlying member or constructor represented by this Member.
abstract boolean	isSynthetic() Returns true if this member was introduced by the compiler; returns false otherwise.

Public Methods

public boolean equals (Object obj)

Compares this Field against the specified object. Returns true if the objects are the same. Two Field objects are the same if they were declared by the same class and have the same name and type.

Parameters

obj	the object to compare this instance with.

Returns

• true if the specified object is equal to this Object; false otherwise.

public Object get (Object obj)

Returns the value of the field represented by this Field, on the specified object. The value is automatically wrapped in an object if it has a primitive type.

The underlying field's value is obtained as follows:

If the underlying field is a static field, the obj argument is ignored; it may be null.

Otherwise, the underlying field is an instance field. If the specified obj argument is null, the method throws a NullPointerException. If the specified object is not an instance of the class or interface declaring the underlying field, the method throws an IllegalArgumentException.

If this Field object is enforcing Java language access control, and the underlying field is inaccessible, the method throws an IllegalAccessException. If the underlying field is static, the class that declared the field is initialized if it has not already been initialized.

Otherwise, the value is retrieved from the underlying instance or static field. If the field has a primitive type, the value is wrapped in an object before being returned, otherwise it is returned as is.

If the field is hidden in the type of obj, the field's value is obtained according to the preceding rules.

Parameters

obj	object from which the represented field's value is to be extracted

Returns

• the value of the represented field in object obj; primitive values are wrapped in an appropriate object before being returned

Throws

IllegalAccessException	if this Field object is enforcing Java language access control and the underlying field is inaccessible.
IllegalArgumentException	if the specified object is not an instance of the class or interface declaring the underlying field (or a subclass or implementor thereof).
NullPointerException	if the specified object is null and the field is an instance field.
ExceptionInInitializerError	if the initialization provoked by this method fails.

public T getAnnotation (Class<T> annotationClass)

Returns this element's annotation for the specified type if such an annotation is present, else null.

Parameters

annotationClass	the Class object corresponding to the annotation type

Returns

• this element's annotation for the specified annotation type if present on this element, else null

Throws

NullPointerException

public T[] getAnnotationsByType (Class<T> annotationClass)

Returns annotations that are associated with this element. If there are no annotations associated with this element, the return value is an array of length 0. The difference between this method and getAnnotation(Class) is that this method detects if its argument is a repeatable annotation type (JLS 9.6), and if so, attempts to find one or more annotations of that type by "looking through" a container annotation. The caller of this method is free to modify the returned array; it will have no effect on the arrays returned to other callers.

Parameters

annotationClass	the Class object corresponding to the annotation type

Returns

• all this element's annotations for the specified annotation type if associated with this element, else an array of length zero

Throws

NullPointerException

public boolean getBoolean (Object obj)

Gets the value of a static or instance boolean field.

Parameters

obj	the object to extract the boolean value from

Returns

• the value of the boolean field

Throws

IllegalAccessException	if this Field object is enforcing Java language access control and the underlying field is inaccessible.
IllegalArgumentException	if the specified object is not an instance of the class or interface declaring the underlying field (or a subclass or implementor thereof), or if the field value cannot be converted to the type boolean by a widening conversion.
NullPointerException	if the specified object is null and the field is an instance field.
ExceptionInInitializerError	if the initialization provoked by this method fails.

See Also

• get(Object)

public byte getByte (Object obj)

Gets the value of a static or instance byte field.

Parameters

obj	the object to extract the byte value from

Returns

• the value of the byte field

Throws

IllegalAccessException	if this Field object is enforcing Java language access control and the underlying field is inaccessible.
IllegalArgumentException	if the specified object is not an instance of the class or interface declaring the underlying field (or a subclass or implementor thereof), or if the field value cannot be converted to the type byte by a widening conversion.
NullPointerException	if the specified object is null and the field is an instance field.
ExceptionInInitializerError	if the initialization provoked by this method fails.

See Also

• get(Object)

public char getChar (Object obj)

Gets the value of a static or instance field of type char or of another primitive type convertible to type char via a widening conversion.

Parameters

obj	the object to extract the char value from

Returns

• the value of the field converted to type char

Throws

IllegalAccessException	if this Field object is enforcing Java language access control and the underlying field is inaccessible.
IllegalArgumentException	if the specified object is not an instance of the class or interface declaring the underlying field (or a subclass or implementor thereof), or if the field value cannot be converted to the type char by a widening conversion.
NullPointerException	if the specified object is null and the field is an instance field.
ExceptionInInitializerError	if the initialization provoked by this method fails.

See Also

• get(Object)

public Annotation[] getDeclaredAnnotations ()

Returns annotations that are directly present on this element. This method ignores inherited annotations. If there are no annotations directly present on this element, the return value is an array of length 0. The caller of this method is free to modify the returned array; it will have no effect on the arrays returned to other callers.

Returns

• annotations directly present on this element

public Class<?> getDeclaringClass ()

Returns the Class object representing the class or interface that declares the field represented by this Field object.

Returns

• an object representing the declaring class of the underlying member

public double getDouble (Object obj)

Gets the value of a static or instance field of type double or of another primitive type convertible to type double via a widening conversion.

Parameters

obj	the object to extract the double value from

Returns

• the value of the field converted to type double

Throws

IllegalAccessException	if this Field object is enforcing Java language access control and the underlying field is inaccessible.
IllegalArgumentException	if the specified object is not an instance of the class or interface declaring the underlying field (or a subclass or implementor thereof), or if the field value cannot be converted to the type double by a widening conversion.
NullPointerException	if the specified object is null and the field is an instance field.
ExceptionInInitializerError	if the initialization provoked by this method fails.

See Also

• get(Object)

public float getFloat (Object obj)

Gets the value of a static or instance field of type float or of another primitive type convertible to type float via a widening conversion.

Parameters

obj	the object to extract the float value from

Returns

• the value of the field converted to type float

Throws

IllegalAccessException	if this Field object is enforcing Java language access control and the underlying field is inaccessible.
IllegalArgumentException	if the specified object is not an instance of the class or interface declaring the underlying field (or a subclass or implementor thereof), or if the field value cannot be converted to the type float by a widening conversion.
NullPointerException	if the specified object is null and the field is an instance field.
ExceptionInInitializerError	if the initialization provoked by this method fails.

See Also

• get(Object)

public Type getGenericType ()

Returns a Type object that represents the declared type for the field represented by this Field object.

If the Type is a parameterized type, the Type object returned must accurately reflect the actual type parameters used in the source code.

If the type of the underlying field is a type variable or a parameterized type, it is created. Otherwise, it is resolved.

Returns

• a Type object that represents the declared type for the field represented by this Field object

Throws

GenericSignatureFormatError	if the generic field signature does not conform to the format specified in The Java™ Virtual Machine Specification
TypeNotPresentException	if the generic type signature of the underlying field refers to a non-existent type declaration
MalformedParameterizedTypeException	if the generic signature of the underlying field refers to a parameterized type that cannot be instantiated for any reason

public int getInt (Object obj)

Gets the value of a static or instance field of type int or of another primitive type convertible to type int via a widening conversion.

Parameters

obj	the object to extract the int value from

Returns

• the value of the field converted to type int

Throws

IllegalAccessException	if this Field object is enforcing Java language access control and the underlying field is inaccessible.
IllegalArgumentException	if the specified object is not an instance of the class or interface declaring the underlying field (or a subclass or implementor thereof), or if the field value cannot be converted to the type int by a widening conversion.
NullPointerException	if the specified object is null and the field is an instance field.
ExceptionInInitializerError	if the initialization provoked by this method fails.

See Also

• get(Object)

public long getLong (Object obj)

Gets the value of a static or instance field of type long or of another primitive type convertible to type long via a widening conversion.

Parameters

obj	the object to extract the long value from

Returns

• the value of the field converted to type long

Throws

IllegalAccessException	if this Field object is enforcing Java language access control and the underlying field is inaccessible.
IllegalArgumentException	if the specified object is not an instance of the class or interface declaring the underlying field (or a subclass or implementor thereof), or if the field value cannot be converted to the type long by a widening conversion.
NullPointerException	if the specified object is null and the field is an instance field.
ExceptionInInitializerError	if the initialization provoked by this method fails.

See Also

• get(Object)

public int getModifiers ()

Returns the Java language modifiers for the field represented by this Field object, as an integer. The Modifier class should be used to decode the modifiers.

Returns

• the Java language modifiers for the underlying member

See Also

• Modifier

public String getName ()

Returns the name of the field represented by this Field object.

Returns

• the simple name of the underlying member

public short getShort (Object obj)

Gets the value of a static or instance field of type short or of another primitive type convertible to type short via a widening conversion.

Parameters

obj	the object to extract the short value from

Returns

• the value of the field converted to type short

Throws

IllegalAccessException	if this Field object is enforcing Java language access control and the underlying field is inaccessible.
IllegalArgumentException	if the specified object is not an instance of the class or interface declaring the underlying field (or a subclass or implementor thereof), or if the field value cannot be converted to the type short by a widening conversion.
NullPointerException	if the specified object is null and the field is an instance field.
ExceptionInInitializerError	if the initialization provoked by this method fails.

See Also

• get(Object)

public Class<?> getType ()

Returns a Class object that identifies the declared type for the field represented by this Field object.

Returns

• a Class object identifying the declared type of the field represented by this object

public int hashCode ()

Returns a hashcode for this Field. This is computed as the exclusive-or of the hashcodes for the underlying field's declaring class name and its name.

Returns

• this object's hash code.

public boolean isAnnotationPresent (Class<? extends Annotation> annotationType)

Returns true if an annotation for the specified type is present on this element, else false. This method is designed primarily for convenient access to marker annotations.

The truth value returned by this method is equivalent to: getAnnotation(annotationClass) != null

The body of the default method is specified to be the code above.

Parameters

annotationType	the Class object corresponding to the annotation type

Returns

• true if an annotation for the specified annotation type is present on this element, else false

public boolean isEnumConstant ()

Returns true if this field represents an element of an enumerated type; returns false otherwise.

Returns

• true if and only if this field represents an element of an enumerated type.

public boolean isSynthetic ()

Returns true if this field is a synthetic field; returns false otherwise.

Returns

• true if and only if this field is a synthetic field as defined by the Java Language Specification.

public void set (Object obj, Object value)

Sets the field represented by this Field object on the specified object argument to the specified new value. The new value is automatically unwrapped if the underlying field has a primitive type.

The operation proceeds as follows:

If the underlying field is static, the obj argument is ignored; it may be null.

Otherwise the underlying field is an instance field. If the specified object argument is null, the method throws a NullPointerException. If the specified object argument is not an instance of the class or interface declaring the underlying field, the method throws an IllegalArgumentException.

If this Field object is enforcing Java language access control, and the underlying field is inaccessible, the method throws an IllegalAccessException.

If the underlying field is final, the method throws an IllegalAccessException unless setAccessible(true) has succeeded for this Field object and the field is non-static. Setting a final field in this way is meaningful only during deserialization or reconstruction of instances of classes with blank final fields, before they are made available for access by other parts of a program. Use in any other context may have unpredictable effects, including cases in which other parts of a program continue to use the original value of this field.

If the underlying field is of a primitive type, an unwrapping conversion is attempted to convert the new value to a value of a primitive type. If this attempt fails, the method throws an IllegalArgumentException.

If, after possible unwrapping, the new value cannot be converted to the type of the underlying field by an identity or widening conversion, the method throws an IllegalArgumentException.

If the underlying field is static, the class that declared the field is initialized if it has not already been initialized.

The field is set to the possibly unwrapped and widened new value.

If the field is hidden in the type of obj, the field's value is set according to the preceding rules.

Parameters

obj	the object whose field should be modified
value	the new value for the field of obj being modified

Throws

IllegalAccessException	if this Field object is enforcing Java language access control and the underlying field is either inaccessible or final.
IllegalArgumentException	if the specified object is not an instance of the class or interface declaring the underlying field (or a subclass or implementor thereof), or if an unwrapping conversion fails.
NullPointerException	if the specified object is null and the field is an instance field.
ExceptionInInitializerError	if the initialization provoked by this method fails.

public void setBoolean (Object obj, boolean b)

Sets the value of a field as a boolean on the specified object. This method is equivalent to set(obj, zObj), where zObj is a Boolean object and zObj.booleanValue() == z.

Parameters

obj	the object whose field should be modified
b

Throws

IllegalAccessException	if this Field object is enforcing Java language access control and the underlying field is either inaccessible or final.
IllegalArgumentException	if the specified object is not an instance of the class or interface declaring the underlying field (or a subclass or implementor thereof), or if an unwrapping conversion fails.
NullPointerException	if the specified object is null and the field is an instance field.
ExceptionInInitializerError	if the initialization provoked by this method fails.

See Also

• set(Object, Object)

public void setByte (Object obj, byte b)

Sets the value of a field as a byte on the specified object. This method is equivalent to set(obj, bObj), where bObj is a Byte object and bObj.byteValue() == b.

Parameters

obj	the object whose field should be modified
b	the new value for the field of obj being modified

Throws

IllegalAccessException	if this Field object is enforcing Java language access control and the underlying field is either inaccessible or final.
IllegalArgumentException	if the specified object is not an instance of the class or interface declaring the underlying field (or a subclass or implementor thereof), or if an unwrapping conversion fails.
NullPointerException	if the specified object is null and the field is an instance field.
ExceptionInInitializerError	if the initialization provoked by this method fails.

See Also

• set(Object, Object)

public void setChar (Object obj, char c)

Sets the value of a field as a char on the specified object. This method is equivalent to set(obj, cObj), where cObj is a Character object and cObj.charValue() == c.

Parameters

obj	the object whose field should be modified
c	the new value for the field of obj being modified

Throws

IllegalAccessException	if this Field object is enforcing Java language access control and the underlying field is either inaccessible or final.
IllegalArgumentException	if the specified object is not an instance of the class or interface declaring the underlying field (or a subclass or implementor thereof), or if an unwrapping conversion fails.
NullPointerException	if the specified object is null and the field is an instance field.
ExceptionInInitializerError	if the initialization provoked by this method fails.

See Also

• set(Object, Object)

public void setDouble (Object obj, double d)

Sets the value of a field as a double on the specified object. This method is equivalent to set(obj, dObj), where dObj is a Double object and dObj.doubleValue() == d.

Parameters

obj	the object whose field should be modified
d	the new value for the field of obj being modified

Throws

IllegalAccessException	if this Field object is enforcing Java language access control and the underlying field is either inaccessible or final.
IllegalArgumentException	if the specified object is not an instance of the class or interface declaring the underlying field (or a subclass or implementor thereof), or if an unwrapping conversion fails.
NullPointerException	if the specified object is null and the field is an instance field.
ExceptionInInitializerError	if the initialization provoked by this method fails.

See Also

• set(Object, Object)

public void setFloat (Object obj, float f)

Sets the value of a field as a float on the specified object. This method is equivalent to set(obj, fObj), where fObj is a Float object and fObj.floatValue() == f.

Parameters

obj	the object whose field should be modified
f	the new value for the field of obj being modified

Throws

IllegalAccessException	if this Field object is enforcing Java language access control and the underlying field is either inaccessible or final.
IllegalArgumentException	if the specified object is not an instance of the class or interface declaring the underlying field (or a subclass or implementor thereof), or if an unwrapping conversion fails.
NullPointerException	if the specified object is null and the field is an instance field.
ExceptionInInitializerError	if the initialization provoked by this method fails.

See Also

• set(Object, Object)

public void setInt (Object obj, int i)

Sets the value of a field as an int on the specified object. This method is equivalent to set(obj, iObj), where iObj is a Integer object and iObj.intValue() == i.

Parameters

obj	the object whose field should be modified
i	the new value for the field of obj being modified

Throws

IllegalAccessException	if this Field object is enforcing Java language access control and the underlying field is either inaccessible or final.
IllegalArgumentException	if the specified object is not an instance of the class or interface declaring the underlying field (or a subclass or implementor thereof), or if an unwrapping conversion fails.
NullPointerException	if the specified object is null and the field is an instance field.
ExceptionInInitializerError	if the initialization provoked by this method fails.

See Also

• set(Object, Object)

public void setLong (Object obj, long l)

Sets the value of a field as a long on the specified object. This method is equivalent to set(obj, lObj), where lObj is a Long object and lObj.longValue() == l.

Parameters

obj	the object whose field should be modified
l	the new value for the field of obj being modified

Throws

IllegalAccessException	if this Field object is enforcing Java language access control and the underlying field is either inaccessible or final.
IllegalArgumentException	if the specified object is not an instance of the class or interface declaring the underlying field (or a subclass or implementor thereof), or if an unwrapping conversion fails.
NullPointerException	if the specified object is null and the field is an instance field.
ExceptionInInitializerError	if the initialization provoked by this method fails.

See Also

• set(Object, Object)

public void setShort (Object obj, short s)

Sets the value of a field as a short on the specified object. This method is equivalent to set(obj, sObj), where sObj is a Short object and sObj.shortValue() == s.

Parameters

obj	the object whose field should be modified
s	the new value for the field of obj being modified

Throws

IllegalAccessException	if this Field object is enforcing Java language access control and the underlying field is either inaccessible or final.
IllegalArgumentException	if the specified object is not an instance of the class or interface declaring the underlying field (or a subclass or implementor thereof), or if an unwrapping conversion fails.
NullPointerException	if the specified object is null and the field is an instance field.
ExceptionInInitializerError	if the initialization provoked by this method fails.

See Also

• set(Object, Object)

public String toGenericString ()

Returns a string describing this Field, including its generic type. The format is the access modifiers for the field, if any, followed by the generic field type, followed by a space, followed by the fully-qualified name of the class declaring the field, followed by a period, followed by the name of the field.

The modifiers are placed in canonical order as specified by "The Java Language Specification". This is public, protected or private first, and then other modifiers in the following order: static, final, transient, volatile.

Returns

• a string describing this Field, including its generic type

public String toString ()

Returns a string describing this Field. The format is the access modifiers for the field, if any, followed by the field type, followed by a space, followed by the fully-qualified name of the class declaring the field, followed by a period, followed by the name of the field. For example:

    public static final int java.lang.Thread.MIN_PRIORITY
    private int java.io.FileDescriptor.fd
 

The modifiers are placed in canonical order as specified by "The Java Language Specification". This is public, protected or private first, and then other modifiers in the following order: static, final, transient, volatile.

Returns

• a string describing this Field