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In Java, a string is an object that represents a sequence of characters. A string is a data type that is used to store text-based information such as names, addresses, messages, and other types of data that consist of a sequence of characters.
In Java, the string class is part of the java.lang package and provides a rich set of methods for working with strings. Some common methods provided by the String class include:
- length(): Returns the length of the string.
- charAt(int index): Returns the character at the specified index in the string.
- substring(int beginIndex, int endIndex): Returns a new string that is a substring of the original string, starting from the specified begin index and ending at the specified end index.
- equals(Object obj): Compares the string with the specified object and returns true if they are equal.
- indexOf(String str): Returns the index of the first occurrence of the specified string in the original string.
Strings in Java are immutable, which means that once a string object is created, its contents cannot be modified. However, you can create a new string by combining one or more existing strings using the “+” operator or the StringBuilder or StringBuffer class.
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