1. Explain the difference between an instance variable and a local variable.

2. What is wrong with these statements?
   int[] a;
   for(i = 0; i <= a.length - 1; i++)
       a[i] = i;

3. Write a main program that accepts an input string in a command line argument. Print out the characters of this string, one character per line.

public static void main(String[] args)
{
    String[] a = {"watermelon", "date",
          "lemon", "orange", "grapefruit", };
    String temp;
    int i;
    for(i = 1; i <= 4; i++)
    {
       temp = a[i];
       a[i] = a[i - 1];
       a[i - 1] = temp;
    }
    for(i = 0; i <= 4; i++)
       System.out.print(a[i].charAt(i));
}

public class A
{
    int a;
    String b;

    public A(int intVal, String strVal)
    {
       a = intVal + 5;
       b = "ss" + strVal;
    }

    public A(String strVal, int intVal)
    {
       a = intVal + 15;
       b = "tt" + strVal;
    }

    public void update()
    {
       a += 5;
       b += "uu";
    }

    public void update(int intVal)
    {
       a += intVal;
       b += String.valueOf(intVal);
    }

    public String toString()
    {
       return a + " " + b;
    }

}

public class Main
{
    public static void main(String[] args)
    {
       int i;
       A[] x = new A[3];
       x[0] = new A(5, "fox");
       x[1] = new A("goose", 7);
       x[2] = x[0];
       x[0].update();
       x[1].update(2);
       x[2].update();
       for(i = 0; i <= 2; i++)
          System.out.println(x[i]);
    }
}

1. Write code for a GroceryItem class. The private instance variables are name (String), barCode (int), and price (double). Write code for a parameterized constructor that initalizes the instance variables, a toString method, a getter method getPrice, and a setter method setPrice.

2. Write a main method that creates a GroceryItem object using data read from the text file c:\GroceryInfo.txt. You may assume one item of data per line, for example:
   2% Milk
   254365786
   2.65

   Then test the toString, getPrice, and setPrice methods.