How Can Strings Be Initialized Using Double Quotes in Java, Despite Being Objects?

Understanding Java's Unique String Initialization

Despite Java's object-oriented nature, the initialization of strings using double quotes raises questions. How is this possible if strings belong to the class structure?

Java's Specialized String

Java's designers sought to retain primitive types within an object-oriented framework to optimize performance. Primitives are housed in the call stack, reducing memory usage and manipulation costs. Meanwhile, objects occupy the program heap, entailing intricate memory management and larger storage requirements.

To bridge this divide, Java's String was designed to possess characteristics of both primitives and classes.

String Literals and Objects

Consider the following examples:

String s1 = "Hello"; // String literal
String s2 = "Hello"; // String literal
String s3 = s1; // Same reference
String s4 = new String("Hello"); // String object
String s5 = new String("Hello"); // String object

The image linked below illustrates this:

[Image of String pool and heap storage]

String literals (s1 and s2) share storage within a common pool, conserving memory. However, String objects (s4 and s5) reside in the heap and are not shared.

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