{"id":174,"date":"2022-01-06T19:39:28","date_gmt":"2022-01-06T14:09:28","guid":{"rendered":"https:\/\/www.scientecheasy.com\/?p=174"},"modified":"2025-05-29T15:44:07","modified_gmt":"2025-05-29T10:14:07","slug":"java-string-class","status":"publish","type":"post","link":"https:\/\/www.scientecheasy.com\/2022\/01\/java-string-class.html\/","title":{"rendered":"String Class in Java | Methods, Examples"},"content":{"rendered":"

In an application or a program, it is common to work with the sequence of text character (e.g., for user interactions or data processing). To support character strings, Java programming language provides a string class<\/strong>. This string class helps to manage text strings effortlessly in the java program.<\/p>\n

String class in Java is used to represent character strings. That is, it is used to store multiple characters. For example, strings such as “12346” and “hello world” are really instances of this class. In Java world, String instances\/objects are usually just called \u201cstrings\u201d.<\/p>\n

As we recall, all strings are stored in heap space when we create string using constructors defined in the java.lang.String class.<\/p>\n

When we create a string directly in double quote without using constructor, that string is stored in a special area of heap space known as \u201cstring constant pool\u201d.<\/p>\n

String Class Syntax and Hierarchy<\/h2>\n
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The general syntax to declare a string class in java is as follows:<\/p>\n

public final class String\r\n    extends Object\r\n        implements Serializable, Comparable<String>, CharSequence\r\n<\/code><\/pre>\n
Java String class inherits from java.lang.Object class<\/a><\/em>. So, in addition to the functionality provided by String class, string can also use all the functionality provided by the Object class and can override them.<\/p>\n
This class also implements three interfaces, such as CharSequence, Comparable, and Serializable. String in Java is final class, which means it cannot be extended.<\/p>\n
String Constructor<\/h2>\n
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String class provides several constructors in java but for the purpose of exam, we only need to be aware of the following constructors.<\/p>\n
1. String()<\/span>:<\/strong> This constructor creates an empty String.<\/p>\n
2. String(byte[ ] bytes)<\/span>:<\/strong> This constructor constructs a new string object by decoding (or converting) the specified array of bytes using the platform’s default charset.<\/p>\n
3. String(byte[ ] bytes, Charset charset)<\/span>:<\/strong> It creates a new string object by decoding the specified array of bytes using the specified charset.<\/p>\n
4. String(byte[ ] bytes, int offset, int length)<\/span>:<\/strong> This form of constructor creates a new string object by decoding the specified subarray of bytes using the platform’s default charset.
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5. String(byte[ ] bytes, int offset, int length, Charset charset)<\/span>:<\/strong> This form of constructor creates a new string object by decoding the specified subarray of bytes using the specified charset.<\/p>\n
6. String(byte[ ] bytes, int offset, int length, String charsetName)<\/span>:<\/strong> This constructor constructs a new string object by decoding the specified subarray of bytes using the specified charset.<\/p>\n
7. String(byte[ ] bytes, String charsetName)<\/span>:<\/strong> It creates a new string object by decoding the specified array of bytes using the specified charset.<\/p>\n
8. String(char[ ] value)<\/span>:<\/strong> This form of constructor allocates a new String so that it represents the sequence of characters currently contained in the character array argument.<\/p>\n
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9. String(char[ ] value, int offset, int count)<\/span>:<\/strong> This form of constructor allocates a new String that contains characters from a subarray of the character array argument.<\/p>\n
10. String(int[ ] codePoints, int offset, int count)<\/span>:<\/strong> This constructor allocates a new string object that contains characters from a subarray of the Unicode code point array argument.<\/p>\n
11. String(String value)<\/span>:<\/strong> It initializes a newly created string object with the same sequence of characters as the argument string. In other words, the newly created string object is a copy of the argument string.<\/p>\n
12. String(StringBuffer buffer)<\/span>:<\/strong> It allocates a new string object that contains the sequence of characters currently contained in the string buffer argument.<\/p>\n
13. String(StringBuilder builder)<\/span>:<\/strong> This constructor allocates a new string object that contains the sequence of characters currently contained in the string builder argument.
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List of Methods of String Class in Java<\/h2>\n
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The java.lang.String class provides various useful methods to perform operations like:<\/p>\n