Java.lang.StringBuilder.codePointBefore() Method



The java.lang.StringBuilder.codePointBefore() method returns the character (Unicode code point) before the specified index. The index refers to char values (Unicode code units) and ranges from 1 to length().


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

public int codePointBefore(int index)


  • index -- This is the index following the code point that should be returned.

Return Value

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


  • IndexOutOfBoundsException -- if the index argument is less than 1 or greater than the length of this sequence.


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

package com.tutorialspoint;

import java.lang.*;

public class StringBuilderDemo {

   public static void main(String[] args) {
   StringBuilder str = new StringBuilder("programming");
   System.out.println("string = " + str);

   // returns the codepoint before index 3
   int retval = str.codePointBefore(3);
   System.out.println("Character(unicode point) = " + retval);
   str = new StringBuilder("amrood admin ");
   System.out.println("string = " + str);
   // returns the codepoint before index 6
   retval = str.codePointBefore(6);
   System.out.println("Character(unicode point) = " + retval);

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

string = programming
Character(unicode point) = 111
string = amrood admin
Character(unicode point) = 100