CRUD con List, implementarlo con Collection<?>

CrudList.java

package net.josemanuel.prietopalacios.util;

import java.util.ArrayList;
import java.util.List;

public class CrudList<T> {

  public List<T> create(){
		return new ArrayList<T>();
	}

	public T read(List<T> list, int index){
		if(list == null) return null;
		if(index < 0) return null;

		if(list.size() > 1){
			return list.get(index);
		}else return null;

	}
	
	public List<T> update(List<T> list, T data, int index){
		if(list == null) return null;
		if(data == null) return null;
		if(index < 0) return null;

		if(list.size() > 1){
			list.remove(index);
			list.add(data);
			return list;
		}else{
			list = create();
			list.add(data);
			return list;
		}

	}

	public List<T> delete(List<T> list, int index){
		if(list == null) return null;
		if(index < 0) return null;
		
		if(list.size() > 1){
			list.remove(index);
			return list;
		}else{
			return create();
		}
	}
	
	public List<T> delete(List<T> list, T data){
		if(list == null) return null;
		if(data == null) return null;
		
		if(list.size() > 1){
			for (int i = 0; i < list.size(); i++) {
				T t = list.get(i);
				if(t.equals(data)){
					return delete(list, i);
				}
			}
			
			return list;
		}else{
			return create();
		}
	}

}