Java.lang.StringBuilder.codePointBefore() Method

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Description

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().

Declaration

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

public int codePointBefore(int index)

Parameters

  • 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.

Exception

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

Example

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



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