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!");
Java String Blog Posts, Tutorials, and Examples
- Java String: A Guide to String Basics, Methods, Immutability, Performance, and Best Practices
- Java String Class API Guide - Covers all the String Methods
- When to Use String, StringBuffer, and StringBuilder in Java
- String vs StringBuilder vs StringBuffer in Java
- Best Way to Reverse a String in Java
- Guide to Java String Constant Pool
- Guide to String Best Practices in Java (Best Practice)
- String Special Operations with Examples
- String Comparison Methods with Examples
- String Methods for Character Extraction
- String Searching Methods with Examples
- String Modifying Methods with Examples
- Java 8 StringJoiner Class
Java StringBuffer Blog Posts, Tutorials, and Examples
- Java StringBuffer: Methods, Examples, and Performance Tips
- Java StringBuffer Class API Guide
- String vs StringBuffer in Java with Example (Performance Analysis)
Java StringBuilder Blog Posts, Tutorials, and Examples
Interview Preparation: Java String Programs with Output
These are the frequently asked Java programs in the interviews:
- Java program to Count Number of Duplicate Words in String
- Java Program to Count Number of Words in Given String
- Java Program to Count the Number of Occurrences of Substring in a String
- Java Program to Count the Occurrences of Each Character in String
- Java Program to Merge Two String Arrays
- Java Program to Remove Duplicate Words from String
- Java Program to Reverse a String(5 ways)
- Java Program to Reverse Each Word of a String
- Java Program to Swap Two Strings
- How to Check if the String Contains Only Digits
- How to Check if the String Contains Only Letters
- How to Check If the String Contains Only Letters or Digits
- Java Program to Check if Input String is Palindrome
- Java Program to Find all Permutations of String
- How to Remove or Trim All White Spaces from a String in Java
- How to Remove Leading and Trailing White Space From a String in Java
- Java Program to Count Duplicate Characters in a String
- Remove Character from String in Java (Java 8)
- Java Program to Count Vowels and Consonants in a String (Java 8)
- 4 Ways to Find First Non-Repeated Character in String in Java
Java String Conversion Examples
Conversion from String to Wrapper classes or Primitive types
- Java Convert Integer to String Example
- Java Convert Float to String Example
- Java Convert Double to String Example
- Java Convert Short to String Example
- Java Convert Long to String Example
- Java Convert Character to String Example
- Java Convert Byte to String Example
- Java Convert Boolean to String Example
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