Can you name classes whose objects cannot be modified after creation?

In Java, objects that cannot be changed after creation are called immutable. Examples of classes with such objects include:

• String — once a string is created, its content cannot be changed.
• Wrapper classes for primitives: Integer, Long, Double, Boolean, etc.
• java.time.LocalDate, LocalDateTime, and other classes from the java.time package.

To make a class immutable, typically:

• All fields are declared as final.
• The class is declared as final, or constructors and methods do not allow inheritance or state modification.
• There are no setters, and all fields are initialized in the constructor.

Example of a simple immutable class:

public final class Point {
    private final int x;
    private final int y;

    public Point(int x, int y) {
        this.x = x;
        this.y = y;
    }

    public int getX() { return x; }
    public int getY() { return y; }
}