How do I convert from int to Long in Java?

Use the following: Long.valueOf(int);.

use

new Long(your_integer);

or

Long.valueOf(your_integer);

Note that there is a difference between a cast to long and a cast to Long. If you cast to long (a primitive value) then it should be automatically boxed to a Long (the reference type that wraps it).

You could alternatively use new to create an instance of Long, initializing it with the int value.

If you already have the int typed as an Integer you can do this:

Integer y = 1;
long x = y.longValue();