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