How Does Java's String Pool Save Memory?

Exploring Java's Memory-Saving String Pool

Question:

What's the purpose of the String Pool in Java? How does it work?

Answer:

The String Pool is a memory optimization technique used in Java. When creating string literals, the compiler checks if a string with the same value already exists in the pool. If so, it uses the existing object instead of creating a new one.

For example, consider the following code:

String s = "a" + "bc";
String t = "ab" + "c";
System.out.println(s == t);

The compiler recognizes that both s and t have the same value, "abc". Therefore, it optimizes the code by creating only one string object, which both s and t reference. This saves memory since there's no need for two identical string objects.

The String Pool is particularly useful for string literals and short strings that are commonly used throughout the code. By reducing the number of string objects, the JVM can allocate memory more efficiently.

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