?? stack.java
字號:
public class Stack {
private java.util.ArrayList pool = new java.util.ArrayList();
public Stack() {
}
public Stack(int n) {
pool.ensureCapacity(n);
}
public void clear() {
pool.clear();
}
public boolean isEmpty() {
return pool.isEmpty();
}
public Object topEl() {
if (isEmpty())
throw new java.util.EmptyStackException();
return pool.get(pool.size()-1);
}
public Object pop() {
if (isEmpty())
throw new java.util.EmptyStackException();
return pool.remove(pool.size()-1);
}
public void push(Object el) {
pool.add(el);
}
public String toString() {
return pool.toString();
}
}
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