سؤال

Possible Duplicate:
Java: length of string when using unicode overline to display square roots?

How do I get number of Unicode characters in a String?

Given a char[] of Thai characters:

[อ, ภ, ิ, ช, า, ต, ิ]

This comes out in String as: อภิชาติ

String.length() returns 7. I understand there are (technically) 7 characters, but I need a method that would return me 5. That is the exact number of character spaces represented on screen.

هل كانت مفيدة؟

المحلول

Seems you just want to not count the unicode marks as separate characters;

static boolean isMark(char ch)
{
    int type = Character.getType(ch);
    return type == Character.NON_SPACING_MARK ||
           type == Character.ENCLOSING_MARK ||
           type == Character.COMBINING_SPACING_MARK;
}

which can be used as;

String olle = "อภิชาติ";
int count = 0;

for(int i=0; i<olle.length(); i++)
{
    if(!isMark(olle.charAt(i)))
        count++;
}

System.out.println(count);

and returns '5'.

نصائح أخرى

You can adapt the solution posted to this question here:

Unicode to string conversion in Java

By stripping the '#' character and counting the remaining characters in the string.

You can use a java.text.BreakIterator to find the gaps between the graphemes ("visual characters") and count them. Here's an example:

import java.text.BreakIterator;

..

int graphemeLength(String str) {
    BreakIterator iter = BreakIterator.getCharacterInstance();
    iter.setText(str);

    int count = 0;
    while (iter.next() != BreakIterator.DONE) count++;

    return count;
}

Now graphemeLength("อภิชาติ") will return 5.

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