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class Stack
{
private Vector items;
public Stack(){
items = new Vector(10);
}

public char push(char item){
items.addElement(item);
return item;
}

public synchronized float pop(){
int len = items.size();
float obj=0;
if(len == 0)
throw new EmptyStackException();
obj = items.elementAt(len-1);
items.removeElementAt(len-1);
return obj;
}

public boolean isEmpty(){
if( item[] == null)
return true;
else
return false;
}


protected void finalize() throws Throwable{
items = null;
super.finalize();
}
}



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