StringBuffer codePointAt() method in Java with Examples (original) (raw)

Last Updated : 04 Dec, 2018

The codePointAt() method of StringBuffer class returns a character Unicode point at that index in sequence contained by StringBuffer. This method returns the “Unicodenumber” of the character at that index. Value of index must be lie between 0 to length-1.
If the char value present at the given index lies in the high-surrogate range, the following index is less than the length of this sequence, and the char value at the following index is in the low-surrogate range, then the supplementary code point corresponding to this surrogate pair is returned. Otherwise, the char value at the given index is returned.

Syntax:

public int codePointAt(int index)

Parameters: This method takes one parameter index which is int value representing index of the character whose unicode value to be returned.

Return Value: This method returns unicode number of the character at the specified index.

Exception: This method throws IndexOutOfBoundsException when index is negative or greater than or equal to length().

Below programs demonstrate the codePointAt() method of StringBuffer Class:

Example 1:

class GFG {

`` public static void main(String[] args)

`` {

`` StringBuffer str = new StringBuffer();

`` str.append( "Geeksforgeeks" );

`` int unicode = str.codePointAt( 10 );

`` System.out.println( "Unicode of Character "

`` + "at Position 10 "

`` + "in StringBuffer = "

`` + unicode);

`` }

}

Output:

Unicode of Character at Position 10 in StringBuffer = 101

Example 2: To demonstrate IndexOutOfBoundsException

class GFG {

`` public static void main(String[] args)

`` {

`` StringBuffer

`` str

`` = new StringBuffer( "GeeksForGeeks Contribute" );

`` try {

`` int i = str.codePointAt( 25 );

`` }

`` catch (IndexOutOfBoundsException e) {

`` System.out.println( "Exception: " + e);

`` }

`` }

}

Output:

Exception: java.lang.StringIndexOutOfBoundsException: String index out of range: 25

References:
https://docs.oracle.com/javase/10/docs/api/java/lang/StringBuffer.html#codePointAt(int)

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Java 2-D Arrays (Matrix) Programs

Print a 2D Array or Matrix in Java In this article, we will learn to Print 2 Dimensional Matrix. 2D-Matrix or Array is a combination of Multiple 1 Dimensional Arrays. In this article we cover different methods to print 2D Array. When we print each element of the 2D array we have to iterate each element so the minimum time complexity 4 min read

Java Program to Add two Matrices Given two matrices A and B of the same size, the task is to add them in Java. Examples: Input: A[][] = {{1, 2}, {3, 4}} B[][] = {{1, 1}, {1, 1}} Output: {{2, 3}, {4, 5}} Input: A[][] = {{2, 4}, {3, 4}} B[][] = {{1, 2}, {1, 3}} Output: {{3, 6}, {4, 7}} Program to Add Two Matrices in JavaFollow the St 2 min read

Sorting a 2D Array according to values in any given column in Java We are given a 2D array of order N X M and a column number K ( 1<=K<=m). Our task is to sort the 2D array according to values in Column K. Examples: Input: If our 2D array is given as (Order 4X4) 39 27 11 42 10 93 91 90 54 78 56 89 24 64 20 65 Sorting it by values in column 3 Output: 39 27 11 3 min read

Java Program to Check if two Arrays are Equal or not In Java, comparing two arrays means checking if they have the same length and identical elements. This checking process ensures that both arrays are equivalent in terms of content and structure. Example: In Java, the simplest way to check if two arrays are equal in Java is by using the built-in Arra 4 min read

Java Program to Find Transpose of Matrix Transpose of a matrix is obtained by changing rows to columns and columns to rows. In other words, the transpose of A[ ][ ] is obtained by changing A[i][j] to A[j][i]. Example of First Transpose of MatrixInput: [ [ 1 , 2 , 3 ] , [ 4 , 5 , 6 ] , [ 7 , 8 , 9 ] ]Output: [ [ 1 , 4 , 7 ] , [ 2 , 5 , 8 ] 5 min read

Java Program to Find the Determinant of a Matrix The determinant of a matrix is a special calculated value that can only be calculated if the matrix has same number of rows and columns (square matrix). It is helpful in determining the system of linear equations, image processing, and determining whether the matrix is singular or non-singular. In t 5 min read

Java Program to Find the Normal and Trace of a Matrix For a given 2D matrix, the purpose is to find the Trace and Normal of the matrix. In this article, we will learn about Normal and Trace of a Matrix in Java. Examples : Input : matrix[][] = {{1, 4, 4}, {2, 3, 7}, {0, 5, 1}}; Output : Normal = 11 Trace = 5 Explanation : Normal = sqrt(1*1+ 4*4 + 4*4 + 3 min read

Java Program to Print Boundary Elements of the Matrix Given a matrix of size Row x Col Print the boundary elements of the matrix. Boundary elements are those elements which are not surrounded by elements on all four directions, i.e. elements in the first row, first column, last row and last column. Example: Input : 1 2 3 4 5 6 7 8 9 Output: 1 2 3 4 6 7 2 min read

Java Program to Rotate Matrix Elements A matrix is simply a two-dimensional array. So, the goal is to deal with fixed indices at which elements are present and to perform operations on indexes such that elements on the addressed should be swapped in such a manner that it should look out as the matrix is rotated. For a given matrix, the t 6 min read

Java Program to Compute the Sum of Diagonals of a Matrix For a given 2D square matrix of size N*N, the task is to find the sum of elements in the Principal and Secondary diagonals. For example, analyze the following 4 Ã— 4 input matrix. a00 a01 a02 a03a10 a11 a12 a13a20 a21 a22 a23a30 a31 a32 a33 Example: Input 1 : 6 7 3 4 8 9 2 1 1 2 9 6 6 5 7 2Output 1 : 4 min read

Java Program to Interchange Elements of First and Last in a Matrix Across Rows For a given 4 Ã— 4 matrix, the task is to interchange the elements of the first and last rows and then return the resultant matrix. Illustration: Input 1: 1 1 5 0 2 3 7 2 8 9 1 3 6 7 8 2 Output 1: 6 7 8 2 2 3 7 2 8 9 1 3 1 1 5 0 Input 2: 7 8 9 10 11 13 14 1 15 7 12 22 11 21 30 1 Output 2: 11 21 30 1 3 min read

Java Program to Interchange Elements of First and Last in a Matrix Across Columns For a given 4 x 4 matrix, the task is to interchange the elements of the first and last columns and then return the resultant matrix. Example Test Case for the ProblemInput : 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16Output : 4 2 3 1 8 6 7 5 12 10 11 9 16 14 15 13 Implementation of Interchange Elements 2 min read

Java String Programs

Java Program to Get a Character from a String Given a String str, the task is to get a specific character from that String at a specific index. Examples: Input: str = "Geeks", index = 2Output: eInput: str = "GeeksForGeeks", index = 5Output: F Below are various ways to do so: Using String.charAt() method: Get the string and the indexGet the spec 5 min read

Replace a character at a specific index in a String in Java In Java, here we are given a string, the task is to replace a character at a specific index in this string. Examples of Replacing Characters in a StringInput: String = "Geeks Gor Geeks", index = 6, ch = 'F'Output: "Geeks For Geeks."Input: String = "Geeks", index = 0, ch = 'g'Output: "geeks"Methods t 3 min read

Reverse a String in Java In Java, reversing a string means reordering the string characters from the last to the first position. Reversing a string is a common task in many Java applications and can be achieved using different approaches. In this article, we will discuss multiple approaches to reverse a string in Java with 7 min read

Java Program to Reverse a String using Stack The Stack is a linear data structure that follows the LIFO(Last In First Out) principle, i.e, the element inserted at the last is the element to come out first. Approach: Push the character one by one into the Stack of datatype character.Pop the character one by one from the Stack until the stack be 2 min read

Sort a String in Java (2 different ways) The string class doesn't have any method that directly sorts a string, but we can sort a string by applying other methods one after another. The string is a sequence of characters. In java, objects of String are immutable which means a constant and cannot be changed once created. Creating a String T 6 min read

Swapping Pairs of Characters in a String in Java Given string str, the task is to write a Java program to swap the pairs of characters of a string. If the string contains an odd number of characters then the last character remains as it is. Examples: Input: str = â€œJavaâ€Output: aJav Explanation: The given string contains even number of characters. 3 min read

Check if a given string is Pangram in Java Given string str, the task is to write Java Program check whether the given string is a pangram or not. A string is a pangram string if it contains all the character of the alphabets ignoring the case of the alphabets. Examples: Input: str = "Abcdefghijklmnopqrstuvwxyz"Output: YesExplanation: The gi 3 min read

Print first letter of each word in a string using regex Given a string, extract the first letter of each word in it. "Words" are defined as contiguous strings of alphabetic characters i.e. any upper or lower case characters a-z or A-Z. Examples: Input : Geeks for geeksOutput :Gfg Input : United KingdomOutput : UKBelow is the Regular expression to extract 3 min read

Java Program to Determine the Unicode Code Point at Given Index in String ASCII is a code that converts the English alphabets to numerics as numeric can convert to the assembly language which our computer understands. For that, we have assigned a number against each character ranging from 0 to 127. Alphabets are case-sensitive lowercase and uppercase are treated different 5 min read

Remove Leading Zeros From String in Java Given a string of digits, remove leading zeros from it. Illustrations: Input : 00000123569Output: 123569 Input: 000012356090Output: 12356090 Approach: We use the StringBuffer class as Strings are immutable. Count leading zeros by iterating string using charAt(i) and checking for 0 at the "i" th indi 3 min read

Compare two Strings in Java String in Java are immutable sequences of characters. Comparing strings is the most common task in different scenarios such as input validation or searching algorithms. In this article, we will learn multiple ways to compare two strings in Java with simple examples. Example: To compare two strings i 4 min read

Compare two strings lexicographically in Java In this article, we will discuss how we can compare two strings lexicographically in Java. One solution is to use Java compareTo() method. The method compareTo() is used for comparing two strings lexicographically in Java. Each character of both the strings is converted into a Unicode value for comp 3 min read

Java program to print Even length words in a String Given a string s, write a Java program to print all words with even length in the given string. Example to print even length words in a String Input: s = "i am Geeks for Geeks and a Geek" Output: am Geek Example: [GFGTABS] Java // Java program to print // even length words in a string class GfG { pu 3 min read

Insert a String into another String in Java Given a String, the task is to insert another string in between the given String at a particular specified index in Java. Examples: Input: originalString = "GeeksGeeks", stringToBeInserted = "For", index = 4 Output: "GeeksForGeeks" Input: originalString = "Computer Portal", stringToBeInserted = "Sci 4 min read

Split a String into a Number of Substrings in Java Given a String, the task it to split the String into a number of substrings. A String in java can be of 0 or more characters. Examples : (a) "" is a String in java with 0 character (b) "d" is a String in java with 1 character (c) "This is a sentence." is a string with 19 characters. Substring: A Str 5 min read