Only allow the string to the list
HelloI have an ArrayList.
ArrayList as = new ArrayList();
Now, I want to let only the string to add in this list of tables how can I achieve this? Don't want to use generic.Please guide.
Ankur Raiyani wrote:
I was asked to do not use generic.
In example you saw generics. It is clearly said if you don't want to use generic drugs, and then use the instanceof keyword.
I want that list allows me only to add the string if I add another object, then it should throw an error.
Exactly, I give an idea how to use instanceof and allow that string in the arraylist objects.
If not clear, please go through the below program:
import java.util.*;
import java.lang.*;
class ArrayListForOnlyString
{
public static void main(String st[])
{
List stringArrayList = new ArrayList(){
public ArrayList ar = new ArrayList();
public boolean add(Object ob) throws UnsupportedOperationException
{
if(ob instanceof String)
{
ar.add(ob);
return true;
}
else
throw new UnsupportedOperationException("Only String Object are accepted");
}
public void add(int index, Object ob)
{
if(ob instanceof String)
{
ar.add(index,ob);
}
else
throw new UnsupportedOperationException("Only String Object are accepted");
}
public Object[] toArray()
{
return ar.toArray();
}
public String toString()
{
return ar.toString();
}
};
try
{
stringArrayList.add(new String("10"));
stringArrayList.add(1,new String("10"));
// Uncomment the below line and run, it 'll give error , as you are trying to add Integer Object to array list.
//stringArrayList.add(new Integer("10"));
System.out.println("The objects of arrayList are : "+stringArrayList);
}catch(Exception e)
{
e.printStackTrace();
}
}
}
Published by: 833545 on August 31, 2011 15:53
Tags: Java
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