Can you give an example of an object whose properties cannot be changed after creation?

An example of an object with immutable properties is the String class in Java. Once a String object is created, its contents cannot be changed.

This means that methods that seem to modify the string (for example, toUpperCase()) actually return a new String object, and the original remains unchanged.

Example:

String s = "hello";
String s2 = s.toUpperCase(); // s2 = "HELLO", s = "hello"

This behavior ensures safety and convenience when working with strings.