How can you create user defined immutable object in java?

Answer 1

Define your own class which will have all members final

& methods to return values of variable only

/*

javavishal.blogspot.com

This code shows the way to make a class immutable

*/

// The immutable class

final class VImmutableClass

{

// instance var are made private & final to restrict the access

private final int prop1;

// Constructor where we can provide the constant value

public VImmutableClass(int vprop1)

{

prop1 = vprop1

}

// provide only methods which return the instance var

// & not change the values

public int getProp1()

{

return prop1;

}

}

// class MyImmutable

public class MyImmutable

{

public static void main(String[] args)

{

VImmutableClass obj1 = new VImmutableClass(3);

System.out.println(obj1.getProp1());

// there is no way to change the values of count & value-

// no method to call besides getXX, no subclassing, no public access to var -> Immutable

}

}