package com.coding.basic;
public class Stack {
private ArrayList elementData = new ArrayList();
public void push(Object o){
elementData.add(o);
}
public Object pop(){
return elementData.remove(elementData.size()-1);
}
public Object peek(){
return elementData.get(elementData.size()-1);
}
public boolean isEmpty(){
if (elementData.size()>0) {
return false;
}
return true;
}
public int size(){
return elementData.size();
}
public static void main(String[] args) {
Stack st = new Stack();
st.push("aaa");
st.push("bbb");
st.push("ccc");
System.out.println(st.isEmpty());
int length = st.size();
for (int i = 0; i < length; i++) {
System.out.println(st.peek());
}
System.out.println(st.isEmpty());
}
}