Let's implement a classic algorithm: binary search on an array. Implement a class named BinarySearcher that provides one static method named search. search takes a SearchList as its first parameter and a Comparable as its second. If either parameter is null, or if the SearchList is empty, you should throw an IllegalArgumentException. SearchList is a provided class. It provides a get(int) method that returns the Comparable at that index, and a size method that returns the size of the SearchList. Those are the only two methods you should need! search returns a boolean indicating whether the passed value is located in the sorted SearchList. To search the sorted SearchList efficiently, implement the following algorithm: Examine the value in the middle of the current array (index (start + end) / 2) If the midpoint value is the value that we are looking for, return true If the value that we are looking for is greater than the midpoint value, adjust the current array to start at the midpoint if the value that we are looking for is less than the midpoint value, adjust the current array to end at the midpoint Continue until you find the value, or until the start reaches the end, at which point you can give up and return false This is a fun problem! Good luck! Keep in mind that every time you call SearchList. get that counts as one access, so you'll need to reduce unnecessary accesses to pass the test suite.

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Explanation:

import java.util.ArrayList;

import java.util.List;

//classs named BinarySearcher

public class BinarySearcher {

//   main method

  public static void main(String[] args) {

//   create a list of Comparable type

      List<Comparable> list = new ArrayList<>();

//       add elements

      list.add(1);

      list.add(2);

      list.add(3);

      list.add(4);

      list.add(5);

      list.add(6);

      list.add(7);

//       print list

      System.out.println("\nList : "+list);

//       test search method

      Comparable a = 7;

      System.out.println("\nSearch for 7 : "+search(list,a));

      Comparable b = 3;

      System.out.println("\nSearch for 3 : "+search(list,b));

      Comparable c = 9;

      System.out.println("\nSearch for 9 : "+search(list,c));

      Comparable d = 1;

      System.out.println("\nSearch for 1 : "+search(list,d));

      Comparable e = 12;

      System.out.println("\nSearch for 12 : "+search(list,e));

      Comparable f = 0;

      System.out.println("\nSearch for 0 : "+search(list,f));

  }

//   static method named search takes arguments Comparable list and Comparable parameter

  public static boolean search(List<Comparable> list, Comparable par) {

//       if list is empty or parameter is null the throw IllegalArgumentException

      if(list.isEmpty() || par == null ) {

          throw new IllegalArgumentException();

      }

//       binary search

//       declare variables

      int start=0;

      int end =list.size()-1;

//       using while loop

      while(start<=end) {

//           mid element

          int mid =(start+end)/2;

//           if par equal to mid element then return

          if(list.get(mid).equals(par) )

          {

              return true ;

          }  

//           if mid is less than parameter

          else if (list.get(mid).compareTo(par) < 0 ) {

              start=mid+1;

          }

//           if mid is greater than parameter

          else {

              end=mid-1;

          }

      }

//       if not found then retuen false

      return false;

  }

}import java.util.ArrayList;

import java.util.List;

//classs named BinarySearcher

public class BinarySearcher {

//   main method

  public static void main(String[] args) {

//   create a list of Comparable type

      List<Comparable> list = new ArrayList<>();

//       add elements

      list.add(1);

      list.add(2);

      list.add(3);

      list.add(4);

      list.add(5);

      list.add(6);

      list.add(7);

//       print list

      System.out.println("\nList : "+list);

//       test search method

      Comparable a = 7;

      System.out.println("\nSearch for 7 : "+search(list,a));

      Comparable b = 3;

      System.out.println("\nSearch for 3 : "+search(list,b));

      Comparable c = 9;

      System.out.println("\nSearch for 9 : "+search(list,c));

      Comparable d = 1;

      System.out.println("\nSearch for 1 : "+search(list,d));

      Comparable e = 12;

      System.out.println("\nSearch for 12 : "+search(list,e));

      Comparable f = 0;

      System.out.println("\nSearch for 0 : "+search(list,f));

  }

//   static method named search takes arguments Comparable list and Comparable parameter

  public static boolean search(List<Comparable> list, Comparable par) {

//       if list is empty or parameter is null the throw IllegalArgumentException

      if(list.isEmpty() || par == null ) {

          throw new IllegalArgumentException();

      }

//       binary search

//       declare variables

      int start=0;

      int end =list.size()-1;

//       using while loop

      while(start<=end) {

//           mid element

          int mid =(start+end)/2;

//           if par equal to mid element then return

          if(list.get(mid).equals(par) )

          {

              return true ;

          }  

//           if mid is less than parameter

          else if (list.get(mid).compareTo(par) < 0 ) {

              start=mid+1;

          }

//           if mid is greater than parameter

          else {

              end=mid-1;

          }

      }

//       if not found then retuen false

      return false;

  }

}

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