Java(TM) 2 Platform, Standard Edition, v1.2.2 API Specification: Class FieldPosition - JDK 5 Documentation v1.2.2, Java 2 SDK 英文文档

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java.text
Class FieldPosition

java.lang.Object
  |
  +--java.text.FieldPosition

public class FieldPosition
extends Object

FieldPosition is a simple class used by Format and its subclasses to identify fields in formatted output. Fields are identified by constants, whose names typically end with _FIELD, defined in the various subclasses of Format. See ERA_FIELD and its friends in DateFormat for an example.

FieldPosition keeps track of the position of the field within the formatted output with two indices: the index of the first character of the field and the index of the last character of the field.

One version of the format method in the various Format classes requires a FieldPosition object as an argument. You use this format method to perform partial formatting or to get information about the formatted output (such as the position of a field).

See Also:: Format

Constructor Summary

FieldPosition(int field)
          Creates a FieldPosition object for the given field.

Method Summary

boolean equals(Object obj)
          Overrides equals

int getBeginIndex()
          Retrieves the index of the first character in the requested field.

int getEndIndex()
          Retrieves the index of the character following the last character in the requested field.

int getField()
          Retrieves the field identifier.

int hashCode()
          Returns a hash code for this FieldPosition.

void setBeginIndex(int bi)
          Sets the begin index.

void setEndIndex(int ei)
          Sets the end index.

String toString()
          Return a string representation of this FieldPosition.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

FieldPosition

public FieldPosition(int field)

Creates a FieldPosition object for the given field. Fields are identified by constants, whose names typically end with _FIELD, in the various subclasses of Format.

See Also:: NumberFormat.INTEGER_FIELD, NumberFormat.FRACTION_FIELD, DateFormat.YEAR_FIELD, DateFormat.MONTH_FIELD

Method Detail

getField

public int getField()

Retrieves the field identifier.

getBeginIndex

public int getBeginIndex()

Retrieves the index of the first character in the requested field.

getEndIndex

public int getEndIndex()

Retrieves the index of the character following the last character in the requested field.

setBeginIndex

public void setBeginIndex(int bi)

Sets the begin index. For use by subclasses of Format.

setEndIndex

public void setEndIndex(int ei)

Sets the end index. For use by subclasses of Format.

equals

public boolean equals(Object obj)

Overrides equals

Overrides:: equals in class Object

Tags copied from class: Object

Parameters:: obj - the reference object with which to compare.
Returns:: true if this object is the same as the obj argument; false otherwise.
See Also:: Boolean.hashCode(), Hashtable

hashCode

public int hashCode()

Returns a hash code for this FieldPosition.

Overrides:: hashCode in class Object

Returns:: a hash code value for this object

toString

public String toString()

Return a string representation of this FieldPosition.

Overrides:: toString in class Object

Returns:: a string representation of this object