Recursive Binary Search Implementation in Java : Sort Search « Collections Data Structure « Java

1. Java
2. Collections Data Structure
3. Sort Search

Recursive Binary Search Implementation in Java

publicclass Main { publicstaticfinalint NOT_FOUND = -1; publicstaticint binarySearch(Comparable[] a, Comparable x) { return binarySearch(a, x, 0, a.length - 1); } privatestaticint binarySearch(Comparable[] a, Comparable x, int low, int high) { if (low > high) return NOT_FOUND; int mid = (low + high) / 2; if (a[mid].compareTo(x) < 0) return binarySearch(a, x, mid + 1, high); elseif (a[mid].compareTo(x) > 0) return binarySearch(a, x, low, mid - 1); elsereturn mid; } publicstaticvoid main(String[] args) { int SIZE = 8; Comparable[] a = newInteger[SIZE]; for (int i = 0; i < SIZE; i++) a[i] = newInteger(i * 2); for (int i = 0; i < SIZE * 2; i++) System.out.println("Found " + i + " at " + binarySearch(a, newInteger(i))); } } 

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