Thread: How to difine type each object is in a ArrayList

Hello,

i tried to build a small code to use it in bigger one, anyway i have problem with define the type of the parameters in the ArrayList

import java.util.ArrayList;
 
public class ArrList1 {
 
protected static ArrayList col1 = new ArrayList();
 
	public  void arrList() {
 
col1.add("hallo");
col1.add(2);
col1.add(3);
col1.add(4.0);
col1.add(5.5);
col1.add(6);
}
 }

now i want to print the certain value specified by user to print the content of the Arraylist with determining if its type is String. int, float or double

import java.util.Scanner;
 
 
public class test extends ArrList1{
 
 
	public static void main(String[] args){
 
		ArrList1 arr = new ArrList1();
		arr.arrList();
 
		Scanner keyboard = new Scanner (System.in);
		System.out.print("Please enter Value from 0-5: ");
		int f = keyboard.nextInt();
 
 
		   if(col1.get(f) != null){
 
	       	 	if (col1.get(f).equals(Integer.TYPE)) 
	            {
			       int NewColumn;
			       NewColumn =  (int) col1.get(f);
			       System.out.println("Integer" + f );
	            } 
 
	       	 	else if (col1.get(f).equals(String.class)) 
	            {
			       String NewColumn;
			       NewColumn =  (String) col1.get(f);
			       System.out.println("String" + f );
	            }
 
	       	 	else if (col1.get(f).equals(Double.TYPE)) 
	            {
			       double NewColumn;
			       NewColumn =  (double) col1.get(f);
			       System.out.println("Double" + f );
	            }
 
	       	 	else if (col1.get(f).equals(Float.TYPE)) 
	            {
			       float NewColumn;
			       NewColumn =  (float) col1.get(f);
			       System.out.println("Float" + f );
	            }
	}
 
	}
}

the problem it print nothing

why??