Java String Handling Tutorial

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On this page, you will find all the tutorials, guides, and examples on Java String, StringBuilder, and StringBuffer.

In Java, String, StringBuilder, and StringBuffer are used to represent and manipulate sequences of characters.

String

Immutable: Once a String object is created, its value cannot be changed. Any modification to the string results in a new object.

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

Performance: Since strings are immutable, repeated modifications can be less efficient as new objects are created for each change.

Thread Safety: Immutable objects are inherently thread-safe, so no synchronization is required.

Example:

String str = "Hello, World!";

StringBuilder

Mutable: Unlike String, StringBuilder is mutable, meaning that its content can be changed without creating a new object.

Syntax: StringBuilder objects must be explicitly created using the new keyword.

Performance: Since it's mutable, StringBuilder is generally more efficient for repeated modifications to the same object.

Thread Safety: It is not synchronized, making it not thread-safe. It's suitable for single-threaded scenarios.

Example:

StringBuilder builder = new StringBuilder("Hello");
builder.append(", World!");

StringBuffer

Mutable: Like StringBuilder, StringBuffer is also mutable.

Syntax: StringBuffer objects must be explicitly created using the new keyword.

Performance: Slightly slower than StringBuilder due to synchronization.

Thread Safety: It is synchronized, making it thread-safe. If you need to manipulate strings across multiple threads, StringBuffer might be the preferred option.

Example:

StringBuffer buffer = new StringBuffer("Hello");
buffer.append(", World!");

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Java String Class Methods

The String class in Java is one of the most widely used classes. It provides a variety of methods for manipulating strings, such as comparing, searching, and modifying strings. Understanding these methods is crucial for efficient string manipulation in Java.

Java Guides

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