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Java String

In Java, a String is a sequence of characters used to store and manipulate text. Strings are immutable, meaning once created, their value cannot be changed. They are objects of the String class, which provides various methods for string manipulation, such as concatenation, comparison, substring extraction, and more.

String Basics

Creating Strings:
Strings can be created using string literals or by using the new keyword.

String greeting = "Hello, World!";
String anotherGreeting = new String("Hello, World!");

Common String Methods:
- length(): Returns the length of the string.
- substring(int beginIndex, int endIndex): Returns a part of the string.
- equals(Object obj): Compares two strings for equality.
- toUpperCase(), toLowerCase(): Converts the string to uppercase or lowercase.

Java strings are widely used for handling textual data, and their immutability ensures safety and efficiency in many programming scenarios.

Short Video Lecture

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VisualCodeChat Tutoring (Exercise: Extract Substring)

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After-class Exercises

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