Designing a stack interface (HELP!)

Question

Hey guys, Im new to Java and to the forums, and I need desperate help, so I'd appreciate some. I need to design a Stack interface, implementing an ArrayStack class. It should be a ordinary Java array. I also need to write an application demonstrating the use of the stack. The problem is to read a sentence from System.in, using a scanner, and outputting the words of the sentence in reverse order. Here is what Ive been working on for the past few hours.
public interface Stack <c> {
     public boolean isEmpty();
     public void popAll();
     public void push(Object c) throws Exception;
     public void pop() throws Exception;
     public Object peek() throws Exception;
public class ArrayStack <c> implements Stack <c> {
     private Object item [];
     private int top;
     public ArrayStack(int MAX) {
          top = -1;
     @Override
     public boolean isEmpty() {
          return (top == -1);
          // TODO Auto-generated method stub
     @Override
     public void popAll() {
          // TODO Auto-generated method stub
     @SuppressWarnings("unchecked")
     @Override
     public Object peek() throws Exception {
          return item[top];
     @SuppressWarnings("unchecked")
     @Override
     public void pop() throws Exception {
          // TODO Auto-generated method stub
          return item[top--];
     public Object push(Object c) throws Exception {
          item[++top] = c;
          return null;
import java.util.ArrayList;
import java.util.Scanner;
public class UseStack {
     public static void main(String args[]){
          Scanner input = new Scanner(System.in);
// declare and create an ArrayList that will hold String objects
ArrayList<String> wordList = new ArrayList<String>();
while (input.hasNext()) {
String word = input.next();
wordList.add(word);
for (int c = wordList.size() - 1; c >= 0; c--) {
System.out.println(wordList.get(c));
I know its a mess but please help me out and tell me where Im going wrong. Thanks so much

Answer 1

Here is the new thing i got
public interface Stack <c> {
     public void push(char c) throws Exception;
     public char pop() throws Exception;
     public char peek() throws Exception;
     public int size();
     public boolean isEmpty();
public class ArrayStack <c> implements Stack <c> {
     private char [] arrayStack;
     private int top;
     public ArrayStack(int MAX) {
          arrayStack = new char [MAX];
          top = -1;
     public boolean isEmpty() {
          return (top == -1);
     public char peek() throws Exception {
          return arrayStack[top];
     public char pop() throws Exception {
          return arrayStack[top--];
     public void push(char c) throws Exception {
          arrayStack[++top] = c;
          return;
public int size() {
          return 0;
public class UseStack {
     public static void main(String args[]){
     }}