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package ch03;

/**

* Created by cookfront on 2017/3/2.

*

* 数组实现的队列

*/

public class MyArrayStack<AnyType> {

private static final int DEFAULT_CAPACITY = 5;

private int topOfStack;

private AnyType[] theItems;

private int theSize;

public MyArrayStack() {

doClear();

}

private void doClear() {

theSize = 0;

topOfStack = -1;

ensureCapacity(DEFAULT_CAPACITY);

}

public void clear() {

doClear();

}

public int size() {

return theSize;

}

public boolean isEmpty() {

return theSize == 0;

}

public void push(AnyType val) {

if (theItems.length == size()) {

ensureCapacity(size() * 2 + 1);

}

theItems[++topOfStack] = val;

theSize++;

}

public AnyType pop() {

theSize--;

return theItems[topOfStack--];

}

public void ensureCapacity(int newCapacity) {

if (newCapacity < theSize) {

return;

}

AnyType[] old = theItems;

theItems = (AnyType []) new Object[newCapacity];

for (int i = 0; i < size(); i++) {

theItems[i] = old[i];

}

}

}