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a guest Feb 19th, 2019 65 Never
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  1. // Java program to demonstrate working of Collections.
  2. // binarySearch()
  3. import java.util.List;
  4. import java.util.ArrayList;
  5. import java.util.Collections;
  6.    
  7. public class GFG
  8. {
  9.     public static void main(String[] args)
  10.     {
  11.         List<Integer> al = new ArrayList<Integer>();
  12.         al.add(1);
  13.         al.add(2);
  14.         al.add(3);
  15.         al.add(10);
  16.         al.add(20);
  17.    
  18.         // 10 is present at index 3.
  19.         int key = 10;
  20.         int res = Collections.binarySearch(al, key);
  21.         if (res >= 0)
  22.             System.out.println(key + " found at index = "
  23.                                                  + res);
  24.         else
  25.             System.out.println(key + " Not found");
  26.  
  27.         key = 15;
  28.         res = Collections.binarySearch(al, key);
  29.         if (res >= 0)
  30.             System.out.println(key + " found at index = "
  31.                                                   + res);
  32.         else
  33.             System.out.println(key + " Not found");
  34.     }
  35. }
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