How to Optimize String Creation in Java? Last Updated : 02 Dec, 2024 Comments Improve Suggest changes Like Article Like Report In Java, strings are frequently used, and optimizing their creation can help improve performance, especially when creating many strings in a program. In this article, we will explore simple ways to optimize string creation in Java.Example:Using the new keyword creates a new string object. This is straightforward but can be slow if used repeatedly. Java // String creation using new keyword public class StringCreation { public static void main(String[] args) { String[] s = new String[50000]; // Array of strings long startTime = System.currentTimeMillis(); for (int i = 0; i < 50000; i++) { // Using 'new' to create strings s[i] = new String("GeeksforGeeks"); } long endTime = System.currentTimeMillis(); System.out.println("Time taken using 'new': " + (endTime - startTime) + " ms"); } } OutputTime taken using 'new': 5 ms Different Ways to Optimize String Creation in Java1. Using String.intern() MethodString.intern() method helps by storing only one copy of each string in memory. This is useful if the same string is used multiple times in your program. Java // String creation using intern() method public class StringCreation { public static void main(String[] args) { String[] s = new String[50000]; // Array of strings long startTime = System.currentTimeMillis(); for (int i = 0; i < 50000; i++) { // Interning the string s[i] = new String("GeeksforGeeks").intern(); } long endTime = System.currentTimeMillis(); System.out.println("Time taken using intern(): " + (endTime - startTime) + " ms"); } } OutputTime taken using intern(): 43 ms Note: The creation time of objects with an intern() and creation time of objects with 'new' keyword fluctuate near each other's creation time.2. Using String LiteralsA string literal is the most efficient way to create strings. When you use a string literal, Java automatically checks if the string already exists in the memory and reuses it.Note: It is the fastest way of string creation.Example: Java // String creation using literals public class StringCreation { public static void main(String[] args) { String[] s = new String[50000]; // Array of strings long startTime = System.currentTimeMillis(); for (int i = 0; i < 50000; i++) { // Using a string literal s[i] = "GeeksforGeeks"; } long endTime = System.currentTimeMillis(); System.out.println("Time taken using string literals: " + (endTime - startTime) + " ms"); } } OutputTime taken using string literals: 2 ms Efficiency of All Methodsnew Keyword: Slower and creates a new string object each time.intern() Method: Reduces memory usage by reusing strings.String Literals: Fastest and most efficient way to create strings. 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