How can you make a Java class immutable

In Java, an immutable class is a class whose instances cannot be modified after they are created. This means that all fields of an immutable class are final and cannot be changed. To create an immutable class, follow these steps:

  • Declare the class as final so it cannot be subclassed.
  • Make all fields private and final.
  • No setter methods should be present in the class.
  • Initialize all fields via a constructor.
  • If the fields contain mutable objects, return copies of those objects instead of the original references.

Here’s an example of an immutable class in Java:

public final class ImmutablePoint { private final int x; private final int y; public ImmutablePoint(int x, int y) { this.x = x; this.y = y; } public int getX() { return x; } public int getY() { return y; } }

Immutable Class Java Final Class Data Integrity Object-Oriented Programming

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