The codePointBefore() method of StringBuffer class is a method used to take an index as a parameter and returns the “Unicode number” of the character present before that index. The value of index must lie between 0 to length-1.
If the char value at (index – 1) is in the low-surrogate range, char at (index – 2) is not negative with value is in the high-surrogate range, then the supplementary code point value of the surrogate pair is returned by method. If the char value at index – 1 is an unpaired low-surrogate or a high-surrogate, the surrogate value is returned.
public int codePointBefore(int index)
Parameters: This method take one parameter index which is the index of the character following the character whose unicode value to be returned.
Return Value: This method returns unicode number of the character before the given index.
Exception: This method throws IndexOutOfBoundsException when index is negative or greater than or equal to length().
Below programs illustrate the codePointBefore() method:
Unicode of character at position 13 = 32
Example 2:To demonstrate IndexOutOfBoundsException
Exception: java.lang.StringIndexOutOfBoundsException: String index out of range: 22
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