Is it possible to generate a random double in Java without any pre-defined boundaries?

I read about Math.random() (https://docs.oracle.com/javase/8/docs/api/java/lang/Math.html#random--)

and

Random(https://docs.oracle.com/javase/8/docs/api/java/util/Random.html)

and I went through almost every post regarding generating random number on stack overflow,

and I still can't figure out how to generate a random number without a per-defined boundaries.

I mean, I know it's possible to write

Random random = new Random();
 int mynumber = random.nextInt(max-min) + min;

but what if I don't want to supply these max and min? what if I want it to be also generated?

Bottom line, my purpose is to generate a random number, which can be also negative in the range of INT_MAX and INT_MIN.

I tried several ways:

 int max = (int)Math.random();
        int min = (int)Math.random();
        double myNumber = new Random().nextInt(max - min) + min;

does not work because (int)Math.random() always gets rounded to 0.

I also tried:

int max = Integer.MAX_VALUE;
        int min = Integer.MIN_VALUE;
        double myNumber = new Random().nextInt(max - min) + min;

and I get The call to 'nextInt' always fails as index is out of bounds .

My purpose is to generate a random double, but Random ().nextInt(x,y) gets only int as x and y. and to do that without supplying pre-defined values of max and min.

How would you suggest me to do that? To generate a random and different double at each run of the program?

Thanks.