I need to convert an int variable to double

To convert an int to a double, you can use the doubleValue() method of the Integer class.

For example:

int i = 5;
double d = i;  // This will automatically convert the int to a double

Alternatively, you can use the Double.valueOf() method to explicitly convert an int to a double:

int i = 5;
double d = Double.valueOf(i);

You can also use the intValue() method of the Double class to convert a double back to an int.

For example:

double d = 5.5;
int i = d.intValue();  // This will convert the double to an int and truncate any decimal values