Home » Java programming language

Java StringBuilder codePointBefore() method with example

StringBuilder Class codePointBefore() method: Here, we are going to learn about the codePointBefore() method of StringBuilder Class with its syntax and example.
Submitted by Preeti Jain, on December 21, 2019

StringBuilder Class codePointBefore() method

• codePointBefore() method is available in java.lang package.
• codePointBefore() method is used to represent the Unicode code point before the given index and array indexing starts from 0 to length() - 1.
• codePointBefore() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
• codePointBefore() method may throw an exception at the time of assigning index.
  IndexOutOfBoundsException - This exception may throw when the given argument value is not less than the length or denotes negative value.

Syntax:

    public int codePointBefore(int indices)

Parameter(s):

• int indices – represents the index of following the Unicode code point that should be retrieved.

Return value:

The return type of this method is int, t returns the Unicode code point before the given indices.

Example:

// Java program to demonstrate the example 
// of int codePointBefore(int indices) method of StringBuilder 
public class CodePointBefore {
    public static void main(String[] args) {
        // Creating an StringBuilder object
        StringBuilder st_b = new StringBuilder("Java");
        System.out.println("st_b = " + st_b);

        // By using codePointBefore(2) method is to return the codepoint
        // at before the given index 2 i.e. it returns codepoint at 
        // following the given index i.e index 1
        int cp = st_b.codePointBefore(2);

        // Display codepoint value at before the given index 2
        System.out.println("st_b.codePointBefore(2)=" + cp);
    }
}

Output

st_b = Java
st_b.codePointBefore(2)=97