ArrayLists and Iterators

Read this chapter about lists and the useful methods that are available for adding and inserting elements into a list. 

10. Summary List Interface



Answer:
0, just as with an array.
    

    
    
    
        
    
        
    
        
    Summary List<E> Interface
    
        
    
    
    

    

    
    
    
        
    
        
    
        
    
    
    

    

    

    
    
    

    

    Here is a summary of the List<E> Interface. For the full interface see the Java documentation.
    

    
    
        
    
            Method
            What it Does
        
    
        
    
            
                
    boolean add(E elt)           
    
                		
            Appends element elt to the end of the list.
        
    
        
    
            
                
    void add(int index, E elt)   
    
                		
            Inserts element elt at the specified index.
        
    
        
    
            
                
    E remove(int index)          
    
                		
            Removes the element at the specified index.
        
    
        
    
            
                
    void clear()                 
    
                		
            Remove all elements, so the list is now empty.
        
    
        
    
            
                
    int indexOf(Object elt)      
    
                		
            Searches for the first occurrence of elt,
    testing for equality using the equals(Object) method.    		
        
    
        
    
            
                
    boolean isEmpty()            
    
                		
            tests if the list is empty
        
    
        
    
            
                
    E set(int index, E elt)      
    
                		
            Replaces the element at index with the specified element elt.
        
    
        
    
            . . . many more . . .
            . . .
        
    
        

    


    

    The E in these descriptions means reference to object of type E or of its subclasses. Of course, the List must have been constructed to hold references to that type.

    

    
    
    

    

    

    
    
    
        
    
        
    
        
    
        
    
            
    
        
    
        
    
    
    
    
    
        
    
    
    


    
    Question 10:
    Here is a declaration and construction of a ArrayList:
      ArrayList<String> data = new ArrayList<String>(10);  
    Which of the following statements will work?
      data.add( "Irene Adler" );
      data.add( new String("Laura Lyons") );
      data.add( 221 );
      data.add( new Integer( 221 ) );