What is a Unicode character? Please explain the use of codePointCount method in java?

Question

Hello, I am learning String methods in Java but can't understand what is meant by Unicode character and what is the use of codePointCount method in Java. I know ASCII, but can't find the relevance. Also, is there any character that doesn't belong to the list of Unicode characters. I need a proper explanation here.

Answer 1

Unicode is just like ASCII but it contains more caracters and emojis

Answer 2

Hope this snippet explains a little bit

https://code.sololearn.com/cuXOVNH8Kx08/?ref=app

Answer 3

Ruchika Sehgal What is the difference between UTF-8, UTF-16 and UTF-32? All of this encoding can store all the characters of the Unicode Standard, The difference among them is the minimum number of bytes used to store a character, UTF-8 uses 1 to 4 bytes to store a character,UTF-16 uses 2 to 4 bytes to store a character and UTF-32 uses only 4 bytes. The number in their names refer to the minimum number of bits they can store:
https://stackoverflow.com/questions/496321/utf-8-utf-16-and-utf-32

Answer 4

The Java codePointCount method is one of the Java String Methods, which is to count the number of Unicode points within the specified text range. In this article, we will show how to use codePointCount in Java Programming language with example. The basic syntax of the codePointCount in Java Programming language is as shown below.
public int codePointCount(int Starting_Index, int End_Index)
//In order to use in program
String_Object.codePointCount(int Starting_Index, int End_Index)
String_Object: Please specify the valid String Object.
Starting_Index: Please specify the index position of the first character.
End_Index: Please specify the index position of a last but one character.
The Java codePointCount Function will count no of Unicode points from Starting_Index to End_Index – 1. Mathematically we say the return value as (End_Index – Starting_Index).
For example, codePointCount(12, 20) will return 8 as an output because 20 – 12 = 8. If we provide the Index position out of range or negative value, then the codePointCount Function will throw an error.

Answer 5

Martin Taylor There are 144,697 Unicode characters which need 21 bytes to be stored, and the nearest it to store them in a 32 byte or 4 byte memory space

Answer 6

Unicode is a standard to convert characters to numbers and UTF is an encoding that converts that numbers to bytes

Answer 7

First Question Answer Unicode is a universal character encoding standard that assigns a code to every character and symbol in every language in the world. Since no other encoding standard supports all languages, Unicode is the only encoding standard that ensures that you can retrieve or combine data using any combination of languages.

Question 2 Answer
The codePointCount() method is used to count the number of Unicode code points in the specified text range of a given String. The text range begins at the specified beginIndex and extends to the char at index endIndex - 1. Thus the length (in chars) of the text range is endIndex-beginIndex

Answer 8

A unicode takes 4 bytes to store whereas ASCII needa only 1 byte

Answer 9

Is there any character that doesn't belong to Unicode?

Answer 10

Ruchika Sehgal Ofcourse there will be because they just can't add all the characters, but they include all english characters, numbers, charaacters with accents and special characters, any character that you can find on your keyboard

Answer 11

And anyways Unicode and UTF are different: https://stackoverflow.com/questions/643694/what-is-the-difference-between-utf-8-and-unicode#:~:text=Unicode%20'translates'%20characters%20to%20ordinal,numbers%20(in%20decimal%20form).&text=UTF%2D8%20is%20an%20encoding,decimal%20form)%20to%20binary%20representations.&text=No%2C%20they%20aren't.,like%20in%20the%20example%20below).

Answer 12

if you write to a 4 byte buffer, symbol あ with UTF8 encoding, your binary will look like this:

00000000 11100011 10000001 10000010

if you write to a 4 byte buffer, symbol あ with UTF16 encoding, your binary will look like this:

00000000 00000000 00110000 01000010

As you can see, depending on what language you would use in your content this will effect your memory accordingly

Answer 13

Ruchika Sehgal complete details about the method which u asking and about unicode .

https://www.tutorialspoint.com/java/lang/string_codepointcount.htm#:~:text=codePointCount()%20method%20returns%20the,text%20range%20is%20endIndex%2DbeginIndex.

Answer 14

fweafwawa what?

Answer 15

Using namespace std; what is this