Java String: codePointCount() Method
codePointCount() method - Number of Unicode code points within the specified text range
The codePointCount() method is used to count the number of Unicode code points in the specified text range of a given String.
The text range begins at the specified beginIndex and extends to the char at index endIndex - 1. Thus the length (in chars) of the text range is endIndex-beginIndex. Unpaired surrogates within the text range count as one code point each.
Java Platform: Java SE 8 and above.
Syntax codePointCount() method
codePointCount(int beginIndex, int endIndex)
Parameters codePointCount() method
| Name | Description | Type |
|---|---|---|
| beginIndex | The index to the first char of the text range. | int |
| endIndex | The index after the last char of the text range. | int |
Return Value codePointCount() method
- The number of Unicode code points in the specified text range.
Return Value Type: int
Throws: IndexOutOfBoundsException - if the beginIndex is negative, or endIndex is larger than the length of this String, or beginIndex is larger than endIndex.
Example: Java String codePointCount() Method
The following example shows the usage of java String() method.
public class Example {
public static void main(String[] args) {
System.out.println();
String str = "w3rsource.com";
System.out.println("Original String : " +str);
// codepoint from index 1 to index 10
int ctr = str.codePointCount(1, 10);
// prints character from index 1 to index 10
System.out.println("Codepoint count = " +ctr);
System.out.println();
}
}
Output:
Original String : w3rsource.com Codepoint count = 9
Example of Throws: codePointCount(int beginIndex, int endIndex) Method
IndexOutOfBoundsException - if the beginIndex is negative, or endIndex is larger than the length of this String, or beginIndex is larger than endIndex.
Let
int ctr = str.codePointCount(-1, 10);
in the above example.
Output:
Original String : w3rsource.com
Exception in thread "main" java.lang.IndexOutOfBoundsEx
ception
at java.lang.String.codePointCount(String.java:
745)
at Exercise.main(Example.java:9)
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