java - Workaround for passing a method into a method? -

i looking way pass method parameter method.

i trying simulate newton's-method (http://en.wikipedia.org/wiki/newton%27s_method) in java following code:

public class newton {   // iterationmethod public void newtoncalc(double x0) {     double x;      // counter     int = 0;      //newton-iteration x0     x = x0 - (y2(x0) / y2deriv(x0));      while (math.sqrt(y2(x)*y2(x)) >= math.pow(10, -10)){         //newton-iteration x(n+1)         x = x - (y2(x))/ y2deriv(x);         i++;         system.out.printf("%d. %.11f\n",i,y2(x));     }      system.out.printf("%d steps necessary resolution of 10^-10", i); }  // function (2) public static double y2(double x) {     return math.sin(x) / (1 - math.tan(x)); }  // derivative (2) public static double y2deriv(double x) {     return (math.cos(x) + math.sin(x) * math.tan(x) * math.tan(x))             / ((math.tan(x) - 1) * (math.tan(x) - 1)); }  // function (4) public static double y4(double x) {     return math.exp(-1/math.sqrt(x)); }  // derivative (4) public static double y4deriv(double x) {     return math.exp(-1/math.sqrt(x))/(2*math.pow(x, 3d/2)); }    public static void main(string[] args) {     newton newton = new newton();     newton.newtoncalc(1); } 

}

newtoncalc(x0) gets x0 @ wich iteration should started. function (y2) hardcoded method. want flexible. example newtoncalc(double x0, method y) run iteration y starting @ x0. have 2 different functions (y2 , y4 both functions excercise sheet lecture plus derivatives y2deriv , y4deriv used in iterationmethod).

i know passing method not possible dont easy workaround.

forgive me if unclear or have missed necessary information!

regards,

tak3r07

it's entirely possible since java 8, using lambda expressions