Modify the interface Stack bellow to add a method abstract public void clear().

public interface Stack { boolean isEmpty(); E peek(); E pop(); void push(E element); } 

Stack.java

public interface Stack { /** * Tests if this Stack is empty. * * @return true if this Stack is empty; and false otherwise. */ public abstract boolean isEmpty(); /** * Returns a reference to the top element; does not change * the state of this Stack. * * @return The top element of this stack without removing it. */ public abstract E peek(); /** * Removes and returns the element at the top of this stack. * * @return The top element of this stack. */ public abstract E pop(); /** * Puts an element onto the top of this stack. * * @param element the element be put onto the top of this stack. */ public abstract void push( E element); /** * Removes all the elements from this stack. Immediately after a * call to the method clear() the method isEmpty() will return * true. */ public abstract void clear(); }