具有分支结构的功能

public class Main {

  public static void main(String[] arguments) {
  /*来自 
   nowjava - 时代Java*/

    double x = Math.E;


    System.out.println("Choose function to evalute for x=" + x);

    System.out.print("(1) Identity, (2) Logarithm, (3) Sinus.Your choice ?");


    System.out.println("F(x)=" + F(2, x));

  }


  public static double F(int generator, double x) {

    double v = 0.0;

    /*
    N o  w  J a v a . c o m - 时  代  Java 提供
    */

    switch (generator) {

    case 1:

      v = x;

      break;

    case 2:

      v = Math.log(x);