Java - String Class
Strings, which are widely used in Java programming, are a sequence of characters. In Java programming language, strings are treated as objects.
The Java platform provides the String class to create and manipulate strings.
Creating Strings
The most direct way to create a string is to write −
String greeting = "Hello world!";Whenever it encounters a string literal in your code, the compiler creates a String object with its value in this case, "Hello world!".
As with any other object, you can create String objects by using the new keyword and a constructor. The String class has 11 constructors that allow you to provide the initial value of the string using different sources, such as an array of characters.
Example to Create Strings in Java
public class StringDemo { public static void main(String args[]) { char[] helloArray = { 'h', 'e', 'l', 'l', 'o', '.' }; String helloString = new String(helloArray); n( helloString ); } }Output
hello.Note − The String class is immutable, so that once it is created a String object cannot be changed. If there is a necessity to make a lot of modifications to Strings of characters, then you sho
Returns the value at the specified index.
Returns the character (Unicode code point) at the specified index.
Returns the character (Unicode code point) before the specified index.
Returns the number of Unicode code points in the specified text range of this .
Compares two strings lexicographically.
Compares two strings lexicographically, ignoring case differences.
Concatenates the specified string to the end of this string.
Returns true if and only if this string contains the specified sequence of char values.
Compares this string to the specified .
Compares this string to the specified .
Equivalent to .
Equivalent to .
Tests if this string ends with the specified suffix.
Compares this string to the specified object.
Compares this to another , ignoring case considerations.
Returns a formatted string using the specified locale, format string, and arguments.
Returns a formatted string using the specified format string and arguments.
Encodes this into a sequence of bytes using the platform's default charset, storing the result into a new byte array.
Java Strings - A Beginner's Guide with Syntax and Examples
Introduction to Java Strings
In Java, strings are a fundamental data type used to represent sequences of characters. Strings are instances of the String class, which is part of the package and is automatically imported into every Java program.
Types of Java Strings
- Java String Literal: A string literal refers to a sequence of characters enclosed within double quotation marks. This type of string is created using the syntax for string literals. For instance:
- Java String Object:Strings in Java are treated as objects of the String class. To create a string object, you utilize the constructor of the class:
- Java Immutable Strings: In the Java programming language, strings are deemed immutable, signifying that their values remain unchanged after their instantiation. Any action that appears to alter a string actually leads to the formation of a new string. This immutability feature contributes to thread safety and memory management:
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