package com.tiaozaoj;
public class NewStack {
private NewArrayList elementData = new NewArrayList();
public void push(Object o){
elementData.add(o);
}
public Object pop(){
Object o = elementData.get(elementData.size());
elementData.remove(elementData.size());
return o;
}
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public Object peek(){
return elementData.get(elementData.size());
}
public boolean isEmpty(){
return elementData.size()>0?false:true;
}
}