Design your own List ADT named StringList to provide the following operations on

Question

 Design your own List ADT named StringList to provide the following operations on a list object: 1. add  (void add(String item) 2. remove (void remove(int index)    and void remove(String item)) 3. size()  (int size()) 4. isEmpty  (boolean isEmpty() ) 5. indexOf  (int indexOf(String item)) 6. hasItem  (boolean hasItem(String item) ) 7. isFull   (boolean isFull() ) 8. getByIndex (String getByIndex(int index)) 9. toString  (String toString(), which returns items in the list in the format              as specified below:         [Bottle water, Turkey, Oil, Banana]  You are required to use array to implement this ADT. Array only, no other data structures can be used to implement the structure. 

Explanation / Answer

public class ADT
{
   String a[] = new String[1000];
   int len=0;
   void add(String s)//add item to array
   {
       a[len++]=s;
       System.out.println(" data added to array ");
   }
   void remove(String s)//remove item from array
   {
       int i,j;
       i = indexOf(s);
       if(i!=-1){
      
       for(j=i;j<len-1;j++)
       {
           a[j]=a[j+1];
       }
       a[j]="";len--;  
       }
   }
   void remove(int i)//remove item at index from array
   {
       int j;
       for(j=i;j<len-1;j++)
       {
           a[j]=a[j+1];
       }
       a[j]="";len--;
   }
   int size()//returning size
   {
       return len;  
   }
   boolean isEmpty()//checking whether empty or not
   {
       if(len==0)return true;
       return false;  
   }
   int indexOf(String s)//finding index of a string in array
   {
       int i;
       for(i=0;i<len;i++)
       {
           if(a[i]==s)return i;  
       }
       return -1;
   }
   boolean hasitem(String s)//checking whether item is present or not
   {
       int i=indexOf(s);
       if(i!=-1)return true;
       return false;  
   }
   boolean isfull()//checking whether list is full or not
   {
       if(len==1000)return true;
           return false;
   }
   String getByindex(int i)//get string by index
   {
       return a[i];  
   }
        String tostring()//get array in string format..
        {
            int i;
            String s="[";
            for(i=0;i<len-1;i++)
                s=s+a[i]+", ";
            s=s+a[i]+" ]";
            return s;
        }
   public static void main(String argv[])
        {
            //testing
            ADT a =new ADT();
            String s;
            a.add("surya");
            a.add("phani");
            s= a.tostring();
            System.out.println(" The list:"+s);
            a.add("suresh");
          
            a.remove("phani");
            System.out.println(" The list:"+s);
            a.remove(1);
            a.add("rk");
          
            System.out.println(" The list:"+s);
          
            System.out.println("value at index 1:"+a.getByindex(1));
          
            System.out.println(" checking whether list is full:"+a.isfull());
          
            System.out.println(" checking whether list is empty:"+a.isEmpty());
          
            System.out.println(" checking SIZE OF LIST:"+a.size());
          
            System.out.println(" checking whether the item is present in list:"+a.hasitem("surya"));
          
          
        }
      
              
}

ouput:-

run:

data added to array

data added to array

The list:[surya, phani ]

data added to array

The list:[surya, phani ]

data added to array

The list:[surya, phani ]
value at index 1:rk

checking whether list is full:false

checking whether list is empty:false

checking SIZE OF LIST:2

checking whether the item is present in list:true
BUILD SUCCESSFUL (total time: 0 seconds)

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