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

  1. #1
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    Default 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??


  2. #2
    Senior Member PhHein's Avatar
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    Default Re: How to difine type each object is in a ArrayList

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

  3. The Following User Says Thank You to PhHein For This Useful Post:

    jps (July 25th, 2013)

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