String Methods in Java | charAt() codePointAt() codePointBefore() codePointCount() | learn Java смотреть онлайн

Java String Methods with Examples: This Java Tutorial video explains different Java String methods associated with the Java String class. Each method is explained with a brief Description, Syntax and an Example
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In this video tutorial, we covered what is a string method in Java, How we define it,
charAt()
codePointAt()
codePointBefore()
codePointCount()
contains()
contentEquals()

Strings
Strings, which are widely used in Java programming, are a sequence of characters. In the Java programming language, strings are objects.

The Java platform provides the String class to create and manipulate strings.

Example:

String str = "codingxpert";

What is String in Java?
Generally, String is a sequence of characters. But in Java, string is an object that represents a sequence of characters. The java.lang.String class is used to create a string object.

A Java string is a sequence of characters that exist as an object of the class java.lang. Java strings are created and manipulated through the string class. Once created, a string is immutable -- its value cannot be changed.

methods of String:

charAt()

charAt() is a method that returns the character from the specified index. Characters in a string are indexed from left to right. The index of the first character is 0, and the index of the last character in a string, called stringName, is stringName.


The codePointAt()

The codePointAt() method returns the Unicode value of the character at the specified index in a string. The index of the first character is 0


codePointBefore()

The codePointBefore() method returns the Unicode value of the character before the specified index in a string. The index of the first character is 1.


codePointCount()
The codePointCount() method returns the number of Unicode values found in a string. Use the startIndex and endIndex parameters to specify where to begin and end the search. The index of the first character is 0, the second character is 1, and so on.

contains()

The contains() method checks whether a string contains a sequence of characters. Returns true if the characters exist and false if not.


contentEquals()

The contentEquals() method searches a string to find out if it contains the exact same sequence of characters in the specified string or StringBuffer.





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