Class java.text.StringCharacterIterator - JDK 5 Documentation v1.1.8, Java 2 SDK 英文文档

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Class java.text.StringCharacterIterator

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

public final class StringCharacterIterator
extends Object
implements CharacterIterator

StringCharacterIterator implements the CharacterIterater protocol for a String. The StringCharacterIterator class iterates over the entire String.

Examples:

Traverse the text from start to finish

 public void traverseForward(CharacterIterator iter) {
     for (char c = iter.first(); c != CharacterIterator.DONE; c = iter.next()) {
         processChar(c);
     }
 }

Traverse the text backwards, from end to start

 public void traverseBackward(CharacterIterator iter) {
     for (char c = iter.last(); c != CharacterIterator.DONE; c = iter.prev()) {
         processChar(c);
     }
 }

Traverse both forward and backward from a given position in the text.

 public void traverseOut(CharacterIterator iter, int pos) {
     for (char c = iter.setIndex(pos);
          c != CharacterIterator.DONE && notBoundary(c);
          c = iter.next()) {}
     int end = iter.getIndex();
     for (char c = iter.setIndex(pos);
          c != CharacterIterator.DONE && notBoundary(c);
          c = iter.prev()) {}
     int start = iter.getIndex();
     processSection(iter.getText.subString(start,end);
 }

StringCharacterIterator(String): Construct an iterator with an initial index of 0.
StringCharacterIterator(String, int): Construct an iterator with the specified initial index.
StringCharacterIterator(String, int, int, int): Construct an iterator over the given range of the given string, with the index set at the specified position.

clone(): Create a copy of this boundary
current(): Get the character at the current position (as returned by getIndex()).
equals(Object): Compares the equality of two StringCharacterIterator objects.
first(): Set the position to getBeginIndex() and return the character at that position.
getBeginIndex(): Return the start index of the text.
getEndIndex(): Return the end index of the text.
getIndex(): Return the current index.
hashCode(): Compute a hashcode for this enumeration
last(): Set the position to getEndIndex() and return the character at that position.
next(): Increment the iterator's index by one and return the character at the new index.
previous(): Decrement the iterator's index by one and return the character at the new index.
setIndex(int): Set the position to specified position in the text and return that character.

StringCharacterIterator

 public StringCharacterIterator(String text)

Construct an iterator with an initial index of 0.

StringCharacterIterator

 public StringCharacterIterator(String text,
                                int pos)

Construct an iterator with the specified initial index.

Parameters:: text - The String to be iterated over; pos - Initial iterator position

StringCharacterIterator

 public StringCharacterIterator(String text,
                                int begin,
                                int end,
                                int pos)

Construct an iterator over the given range of the given string, with the index set at the specified position.

Parameters:: text - The String to be iterated over; begin - Index of the first character; end - Index of the character following the last character; pos - Initial iterator position

first

 public char first()

Set the position to getBeginIndex() and return the character at that position.

last

 public char last()

Set the position to getEndIndex() and return the character at that position.

setIndex

 public char setIndex(int p)

Set the position to specified position in the text and return that character.

current

 public char current()

Get the character at the current position (as returned by getIndex()).

Returns:: the character at the current position or DONE if the current position is off the end of the text.

next

 public char next()

Increment the iterator's index by one and return the character at the new index. If the resulting index is greater or equal to getEndIndex(), the current index is reset to getEndIndex() and a value of DONE is returned.

Returns:: the character at the new position or DONE if the current position is off the end of the text.

previous

 public char previous()

Decrement the iterator's index by one and return the character at the new index. If the resulting index is less than getBeginIndex(), the current index is reset to getBeginIndex() and a value of DONE is returned.

Returns:: the character at the new position or DONE if the current position is off the end of the text.

getBeginIndex

 public int getBeginIndex()

Return the start index of the text.

Returns:: the index at which the text begins.

getEndIndex

 public int getEndIndex()

Return the end index of the text. This index is the index of the first character following the end of the text.

Returns:: the index at which the text end.

getIndex

 public int getIndex()

Return the current index.

Returns:: the current index.

equals

 public boolean equals(Object obj)

Compares the equality of two StringCharacterIterator objects.

Parameters:: obj - the StringCharacterIterator object to be compared with.
Returns:: true if the given obj is the same as this StringCharacterIterator object; false otherwise.
Overrides:: equals in class Object

hashCode

 public int hashCode()

Compute a hashcode for this enumeration

Returns:: A hash code
Overrides:: hashCode in class Object

clone

 public Object clone()

Create a copy of this boundary

Returns:: A copy of this
Overrides:: clone in class Object

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