String Literal Vs String Object in Java
There are two ways to represent strings: string literals and string objects. Here's an explanation of the differences between them:
- A string literal is a sequence of characters enclosed in double quotes (e.g., "Hello, World!").
- When you create a string literal, Java automatically creates a String object that represents that literal.
- String literals are stored in a separate area of memory called the "string pool" or "string constant pool."
- If you create multiple string literals with the same content, they will reference the same object in the string pool.
- String literals are immutable, meaning their values cannot be changed once they are created.
- A string object is created explicitly using the new keyword followed by the String class constructor (e.g., new String("Hello, World!")).
- When you create a string object, Java creates a new instance of the String class, even if the content is the same as an existing string literal.
- String objects are stored in the heap memory, and each object has its own memory space.
- Unlike string literals, string objects created with the new keyword are not automatically interned or stored in the string pool.
- String objects are mutable, meaning you can change their values using methods such as concat(), substring(), or replace().
It's important to note that while the == operator compares the references of string literals or objects, the .equals() method should be used to compare their actual contents. For example:
It is recommended to use string literals whenever possible, as they are more efficient in terms of memory usage and can take advantage of string interning for better performance.