[هلالي و بس]

تفضل الحل

main class:

import java.util.Scanner;


public class Main {

    public static void main(String[] args) {
        int item;
       int array [];
        array=new int[2000];
      Scanner s = new Scanner(System.in);
    for(int i=0; i<array.length;i++){
        array[i]=i;
        
    }
        search obj;
        obj=new search();
        
  System.out.print("enter your number "+"\n");
  item=s.nextInt();
    int plase= obj.bainary_search(array, item); 
    if (plase!=-1) 
    System.out.print(" your number in "+plase+"\n");
Else
    System.out.print(" not found "+plase+"\n");

      }
        }

search class:

public class search {
   
    
      public search(){
    
    }
    
    
    public int bainary_search(int arr[],int  item){
       
        int first=0,last=arr.length-1, mid,dd=-1;
    while(first<=last && dd==-1){
       mid=(first+last)/2; 
    if(arr[mid]==item){
        dd=mid;
    }
    else if (arr[mid]<item){ 
        first=mid+1;
    }
    else
        last=mid-1;

    }
     
   return dd; 
    }

بالتوفيييييق