StringBuilder codePointAt() in Java

codePointAt(): This method is available in java.lang.AbstractStringBuilder class of Java.

Syntax:

int java.lang.AbstractStringBuilder.codePointAt(int index)

This method takes one argument of type int as its parameter. This method returns the character (Unicode code point) at the specified index. The index refers to char values(Unicode code units) and ranges from 0 to length() - 1.

Parameters: One parameter is required for this method.

index: the index to the char values.

Returns: the code point value of the character at the index.

Throws:

StringIndexOutOfBoundsException - if the index argument is negative or not less than the length of this sequence.

For Example:

StringBuilder str = new StringBuilder("Hello World!")

int index = 2

str.codePointAt(index) = > It returns 108.

Approach 1: When the index is in the range.

Java

public class CodePointAt {
    public static void main(String[] args) {
        StringBuilder str = new StringBuilder("Hello World!");

        int index = 2;
        System.out.println(str.codePointAt(index));
    }
}

Output:

108

Approach 2: When the index is out of range.

Java

public class CodePointAt {
    public static void main(String[] args) {
        StringBuilder str = new StringBuilder("Hello World!");

        int index = 15;
        System.out.println(str.codePointAt(index));
    }
}

Output:

Exception in thread "main" java.lang.StringIndexOutOfBoundsException: index 15, length 12
	at java.base/java.lang.String.checkIndex(String.java:3693)
	at java.base/java.lang.AbstractStringBuilder.codePointAt(AbstractStringBuilder.java:382)
	at java.base/java.lang.StringBuilder.codePointAt(StringBuilder.java:85)