Searching
  
 Source Code
  

    
// Contributed by - Anuj Das ( GC College, Silchar - @ Department of Computer Science )
import java.util.Scanner;
import java.util.ArrayList;

class FindNumber {

	public static int searchNumber(ArrayList<Integer> list, int num) {
		for(int i=0; i < list.size(); i++) {

            if(list.get(i) == num) {
            	return (i+1);
            }
        }
       	return 0;
	}

	public static void main(String[ ] args) {
	Scanner input = new Scanner(System.in);
    ArrayList<Integer> list = new ArrayList<>();
        
        System.out.print("Enter the size of Array: ");
        int size = input.nextInt();
        System.out.println("Enter "+size+" Elements: ");
        for(int i=0; i < size; i++) {
            list.add(input.nextInt());
        }
	// Displaying ArrayList
    	for(int i=0; i < list.size(); i++){
		System.out.print(list.get(i)+"  ");
		}
		System.out.print("\n");

		System.out.print("Enter the number to be searched:   ");
		int num = input.nextInt();

		if(searchNumber(list,num) == 0) {
			System.out.println(num+" not found in this given ArrayList!!");
		}
		else {
			System.out.println(num+" found at position:  "+searchNumber(list,num));
		}
	}
}
    

cmd->  javac  FindNumber.java
cmd->  java  FindNumber

Case - 1:
------------------------------------------------------------------
Enter the size of Array: 6
Enter 6 Elements:
45
65
22
58
74
22
45  65  22  58  74  22
Enter the number to be searched:   22
22 found at position:  3


Case - 2:
------------------------------------------------------------------
Enter the size of Array: 7
Enter 7 Elements:
45
21
87
98
54
66
12
45  21  87  98  54  66  12
Enter the number to be searched:   10
10 not found in this given ArrayList!!