import java.util.EmptyStackException;

public class StackOfChars {
	//Data
	private char[] items;
	private int top;
	
	//Constructors
	public StackOfChars() {
		...
	}
	
	public StackOfChars(int n) {
		...
	}
	
	//Public methods
	public boolean isEmpty() { ... }
	
	public boolean isFull() { ... }
		
	public void push(char x) throws FullStackException {
		...
	}
	
	public char pop() throws EmptyStackException {
		...
	}
	
	public char top() throws EmptyStackException {
		...
	}
	
	public int size() { ... }
	public int capacity() { ... }
	public void clear() { ... }
}