Where else do immutable objects show their advantages?

Immutable objects demonstrate their advantages not only in multithreaded programming but also in the following areas:

• Functional programming: where data immutability helps avoid side effects and simplifies debugging.
• Caching and memoization: immutable objects can be safely used as keys or values in caches since they do not change.
• Reactive programming and streaming data: immutability simplifies state management and prevents data races.
• Undo/Redo functionality: storing states as immutable objects makes implementing rollback easier.

Example in Java using an immutable object:

public final class User {
    private final String name;
    private final int age;

    public User(String name, int age) {
        this.name = name;
        this.age = age;
    }

    public String getName() { return name; }
    public int getAge() { return age; }

    // No setters, object is immutable
}

Such an object is safe to use in a multithreaded environment and simplifies application logic.