Question 4-1

Suppose we add the following method definition to our Bank class.

public class Bank {
    // : (definitions of other methods and variables)

    public void remove(int i) throws NoSuchElementException {
        if(i < 0) {
            throw new NoSuchElementException("negative index");
        } else if(i >= num_accts) {
            throw new NoSuchElementException("index too large");
        } else {
            num_accts--;
            accts[i] = num_accts;
        }
    }
}

Suppose we have a Bank variable named first. How would you use this method to remove the third account from first? Be sure to handle any exceptions that the method might initiate; for full credit, your code display the message associated with the exception (like ``negative index'').

public static void run() {
    Bank first = new Bank();
    // : (code that inserts accounts into the bank)



}

Solution

public static void run() {
    Bank first = new Bank();
    // : (code that inserts accounts into the bank)

    try {
        first.remove(2);
    } catch(NoSuchElementException e) {
        IO.println(e.getMessage());
    }
}

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