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ArrayStack.java
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ArrayStack.java
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public class ArrayStack<E> {
private ArrayList<E> list;
public ArrayStack() {
list = new ArrayList();
}
public ArrayStack(int initCapacity) {
list = new ArrayList(initCapacity);
}
public boolean empty() {
return list.size() == 0;
}
/**
* 入栈
* @param e
* @return
*/
public E push(E e) {
list.add(e);
return e;
}
/**
* 出栈
* @return
*/
public E pop() {
return list.remove();
}
/**
* 查看栈顶元素
* @return
*/
public E peek() {
return list.get(list.size() - 1);
}
public int size() {
return list.size();
}
@Override
public String toString() {
StringBuilder result = new StringBuilder();
result.append("{ capacity: " + list.capacity() + ", size: " + list.size() + ", item: [");
for (int i = 0; i < list.size(); i++) {
result.append(list.get(i));
if (i != list.size() - 1) {
result.append(", ");
}
}
result.append("] -> top }");
return result.toString();
}
}