Java.lang.Character.codePointBefore() Method

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Description

The java.lang.Character.codePointBefore(CharSequence seq, int index) returns the code point preceding the given index of the CharSequence. If the char value at (index - 1) in the CharSequence is in the low-surrogate range, (index - 2) is not negative, and the char value at (index - 2) in the CharSequence is in the high-surrogate range, then the supplementary code point corresponding to this surrogate pair is returned.

Otherwise, the char value at (index - 1) is returned.

Declaration

Following is the declaration for java.lang.Character.codePointBefore() method

public static int codePointBefore(CharSequence seq, int index)

Parameters

  • seq - the CharSequence instance

  • index - the index following the code point that should be returned

Return Value

This method returns the Unicode code point value before the given index.

Exception

  • NullPointerException - if a is null.

  • IndexOutOfBoundsException - if the index argument is less than 1 or greater than seq.length()

Example

The following example shows the usage of lang.Character.codePointBefore() method.

package com.tutorialspoint;

import java.lang.*;

public class CharacterDemo {

   public static void main(String[] args) {

      // create a CharSequence seq and assign value
      CharSequence seq = "Hello";

      // create and assign value to index
      int index  = 4;

      // create an int res
      int res;

      // assign result of codePointBefore on seq at index to res
      res = Character.codePointBefore(seq, index);

      String str = "Unicode code point is " + res;

      // print res value
      System.out.println( str );
   }
}

Let us compile and run the above program, this will produce the following result:

Unicode code point is 108



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