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Java Fundamental Classes Reference

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The java.text Package
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FieldPosition

Name

FieldPosition

Synopsis

Class Name:

java.text.FieldPosition

Superclass:

java.lang.Object

Immediate Subclasses:

None

Interfaces Implemented:

None

Availability:

New as of JDK 1.1

Description

The FieldPosition class encapsulates information about fields in formatted output. The fields in a particular type of formatted output are identified by constants. A FieldPosition object contains its field type and the field's position within the formatted output. The field position is specified by the index of the first character in the field and the index of the last character in the field.

You can use a FieldPosition object to find the position of a particular field in a formatted string. Consider the following code:

NumberFormat nf = NumberFormat.getInstance();
StringBuffer sb = new StringBuffer();
FieldPosition fp = new FieldPosition(NumberFormat.FRACTION_FIELD);
nf.format(-1234.56, sb, fp);
System.out.println(new String(sb));
System.out.println("FRACTION_FIELD goes from " + fp.getBeginIndex()
                   + " to " + fp.getEndIndex() + ".");

This code produces the following output:

-1,234.56
FRACTION_FIELD goes from 7 to 9.

Class Summary

public class java.text.FieldPosition extends java.lang.Object {
  // Constructors
  public FieldPosition(int field);
  // Instance Methods
  public int getBeginIndex();
  public int getEndIndex();
  public int getField();
}

Constructors

FieldPosition

public FieldPosition(int field)

Parameters

field

A field constant.

Description

This constructor creates a FieldPosition object that represents the given field.

Instance Methods

getBeginIndex

public int getBeginIndex()

Returns

The beginning index.

Description

This method returns the beginning index of the field that is represented by this FieldPosition.

getEndIndex

public int getEndIndex()

Returns

The ending index of this FieldPosition.

Description

This method returns the ending index of the field that is represented by this FieldPosition.

getField

public int getField()

Returns

The field constant of this FieldPosition.

Description

This method returns the field constant of this FieldPosition.

Inherited Methods

Method Inherited From Method Inherited From

clone()

Object

equals(Object)

Object

finalize()

Object

getClass()

Object

hashCode()

Object

notify()

Object

notifyAll()

Object

toString()

Object

wait()

Object

wait(long)

Object

wait(long, int)

Object

   

See Also

DateFormat, Format, MessageFormat, NumberFormat, ParsePosition, String


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