JDK 9 List.of(...)

		// JDK 9      写法: List.of(...)
//		List<Point> polygon = List.of(new Point(0, 0), new Point(0, 4), new Point(4, 4), new Point(4, 0));// JDK 1.6 写法：使用ArrayList并手动add元素List<Point> polygon = new ArrayList<Point>();polygon.add(new Point(0, 0));polygon.add(new Point(0, 4));polygon.add(new Point(4, 4));polygon.add(new Point(4, 0));

JDK 9 List.of(...)

JDK 1.6            boolean add(E e);

/*** Appends the specified element to the end of this list (optional* operation).** <p>Lists that support this operation may place limitations on what* elements may be added to this list.  In particular, some* lists will refuse to add null elements, and others will impose* restrictions on the type of elements that may be added.  List* classes should clearly specify in their documentation any restrictions* on what elements may be added.** @param e element to be appended to this list* @return <tt>true</tt> (as specified by {@link Collection#add})* @throws UnsupportedOperationException if the <tt>add</tt> operation*         is not supported by this list* @throws ClassCastException if the class of the specified element*         prevents it from being added to this list* @throws NullPointerException if the specified element is null and this*         list does not permit null elements* @throws IllegalArgumentException if some property of this element*         prevents it from being added to this list*/boolean add(E e);