USING JAVA-The code defines 4 variables and sets the variables based on calls to methods. The methods are called f, g, and h. Determine the values of the four variables xl, x2, x3 and x4. double x1(-3) double x2 0.0: x2 h (3.1) double x3-0.0; x3- 1) + f (2) +E (3); double x4g) public static double f (double y) double x x2 (y-1) public static double g (double y) double yl; yl -4 h (y)i public static double h double x)return x*x + -2*x: return xi return yl: show the code and the final values for x1, x2, x3, and x4