标签:exception UNC ann nts col ide row last over
1 源码解析
1.1 源码解析1(jdk中的应用)
1.2 源码解析2(mybaties中的应用)
java.util.Iterator(接口)
public interface Iterator<E> { /** * Returns {@code true} if the iteration has more elements. * (In other words, returns {@code true} if {@link #next} would * return an element rather than throwing an exception.) * * @return {@code true} if the iteration has more elements */
//和我们18-2中的isNext有相同的作用 boolean hasNext();
}
java.util.ArrayList(实现)
private class Itr implements Iterator<E> { public boolean hasNext() { return cursor != size; } @SuppressWarnings("unchecked") public E next() { checkForComodification(); int i = cursor; if (i >= size) throw new NoSuchElementException(); Object[] elementData = ArrayList.this.elementData; if (i >= elementData.length) throw new ConcurrentModificationException(); cursor = i + 1; return (E) elementData[lastRet = i]; } }
DefaultCursor.java
public class DefaultCursor<T> implements Cursor<T> { //创建了游标迭代器
private final CursorIterator cursorIterator = new CursorIterator();
@Override public Iterator<T> iterator() { if (iteratorRetrieved) { throw new IllegalStateException("Cannot open more than one iterator on a Cursor"); } iteratorRetrieved = true; return cursorIterator; } }
标签:exception UNC ann nts col ide row last over
原文地址:https://www.cnblogs.com/1446358788-qq/p/11602443.html