Java Character offsetByCodePoints(char[] a, int start, int count, int index, int codePointOffset) Method

Java offsetByCodePoints(char[] a, int start, int count, int index, int codePointOffset) method is a part of Character class. This method returns the index within the given char subarray that is offset from the given index by codePointOffset code points. The start and count arguments specify a subarray of the char array. Unpaired surrogates within the text range given by index and codePointOffset count as one code point each.

Syntax:

public static int offsetByCodePoints(char[]a, int start, int count, int index, int codePointOffset)  

Parameters:

The parameters passed are:

• a char array
• start - the index of the first char of the subarray
• count - the length of the subarray in chars
• index - the index to be offset
• codePointOffset - the offset in code points

Returns:

Returns the index within the specified subarray.

Exceptions:

NullPointerException - if the char array is null.

Example 1:

Here the index within the specified subarray of the char array is returned.

public class StudyTonight
{  
	public static void main(String[] args)
	{  
		char[] ch = new char[] { 'm', 'o', 'h', 'i', 't' };  
		int start = 1;  
		int count = 4;  
		int r = Character.offsetByCodePoints(ch, start, count, 1, 3);  
		System.out.println("The index within the specified range is : " + r);  
	}
}

The index within the specified range is : 4

Example 2:

Here is a user-defined example where anyone using this code can put a value of his choice and get the equivalent output.

import java.util.Scanner; 
public class StudyTonight
{  
	public static void main(String[] args)
	{  
		try
		{
			Scanner sc = new Scanner(System.in); 
			System.out.print("Enter the characters in array: ");
			char[] ch = sc.next().toCharArray();
			System.out.print("Enter start,count,index and codePointOffset");
			int start = sc.nextInt();
			int count = sc.nextInt();
			int index = sc.nextInt();
			int offset = sc.nextInt();

			int r = Character.offsetByCodePoints(ch, start, count, index, offset);  
			System.out.println("The index within the specified range is : " + r);
		}
		catch(Exception e)
		{
			System.out.println("Invalid Input!!");
		}
	}
}

Enter the characters in array: studytonight
Enter start,count,index and codePointOffset 1 5 1 2
The index within the specified range is : 3
*************************************************************
Enter the characters in array: hello
Enter start,count,index and codePointOffset 1 2 1 3
Invalid Input!!

Live Example:

Here, you can test the live code example. You can execute the example for different values, even can edit and write your examples to test the Java code.