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public class Stack<T>{
private ArrayList<T> list;
public Stack(){
list = new ArrayList<T>();
}
public T pop(){
if(list.size != 0 ){
T popOut = list.get(list.size - 1);
remove(popOut);
return popOut;
}
else{
return null;
}
}
}
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int b;//friendly
protected int c;
public int d;
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