Java'da neden ic ice fonksiyonlar (nested methods) yok ?

 
 import java.lang.System; 
 import java.lang.String; 
  
 public class Main { 
     public static void main(String[] args) { 
  
         int[] array = {3,6,9,12,15,16,17,21,29,35,50}; 
         int number = 35; 
         int result = binarySearch(array, number); 
         System.out.println("Dizide " + number + " sayisi " + (result == -1 ? " bulunmamaktadir." : ( (result+1) + ". elemandir.")) ); 
  
     } 
  
     public static int binarySearch(int[] array, int x) { 
         return _binarySearchRecursive(array, 0, array.length-1, x); 
     } 
     public static int _binarySearchRecursive(int[] array, int l, int r, int x) { 
         if(l > r) return -1; // not found 
         int mid = (l+r)/2; 
         if(x == array[mid]) return mid; 
         if(x < array[mid]) return _binarySearchRecursive(array, l, mid-1, x); 
         else return _binarySearchRecursive(array, mid+1, r, x); 
     } 
 } 
 

def fibonacci(n: Int): BigInt = { 
     def go(n: Int, num: BigInt): BigInt = if (n == 1) num else go(n - 1, num * n) 
  
     go(n, 1) 
   }