java - Switching between codes in my program -


i have 3 programs calculating pi , want refactor one. can't working using if or switch command. case 3. 

public class programpi {     public static void main(string[] args) {             // todo auto-generated method stub              int z = integer.parseint(joptionpane.showinputdialog("wybierz metode liczenia pi 1=leibnitz 2=wallis 3=montecarlo:"));{              switch(z){             case 1:              double pi=0;             double mianownik=1;              double = integer.parseint(joptionpane.showinputdialog("obliczamy pi metoda leibnitza podaj n: "));             (int x = 0; x < i; x++){                 // obliczanie ciagu                 if (x % 2 == 0) {                     pi = pi + (1 / mianownik);                 } else {                     pi=pi - (1 / mianownik);                 }                 mianownik = mianownik + 2;             }             pi = pi * 4;             system.out.println("przy n= " + + " pi = " + pi);     break;           case 2:                 double termcount = 2;                 double polpi = 1;                 double termin;                 // double termino2 =0;                 double n = integer.parseint(joptionpane.showinputdialog("liczymy pi wzorem wallisa, podaj n:"));                 (double j = 0; j <= n; j++)                 {                 termin = (termcount / (termcount-1));                 // system.out.println(termin);                 polpi = polpi * termin;                 termin = (termcount / (termcount+1));                 // system.out.println(termin+" "+ mediopi);                 polpi = polpi * termin;                  termcount= termcount + 2;                 }                 system.out.println("ilosc wyrazen = " + termcount);                 polpi = polpi * 2;                 system.out.println("przy n= " + n + " pi wynosi: " + polpi);             break;     case 3:                      static double podajpi(int liczbastrzalow) {                         int wkole = 0;                         // generowanie punktów                         (int = 0; < liczbastrzalow; i++) {                             double x = math.random();                             double y = math.random();                             // sprawdzanie, czy punkt jest w kole                              // r = 1, więc r * r = 1                             if ((x * x + y * y) <= 1) {                                 wkole++;                             }                         }                         // obliczanie stosunku liczby punktów w kole wszystkich punktów                         double s = (double) wkole / liczbastrzalow;                         return 4 * s;                     }                           system.out.println("pi = " + math.pi);                         // obliczanie pi dla 00, 1000, 10 000, 100 000 oraz 1000 000 punktów                         // można zrobić za pomocą pętli                         (int = 100; <= 1000000; *= 10) {                             double pi = podajpi(i);                             system.out.println("dla " + + " punktów pi = " + pi + "\n"                                     + "błąd =  " + (pi - math.pi));                         }                      }                {                 }                 }


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