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Effective Java: Item 1

Static Factory Methods
Four Advantages:
1) have names
2) not required to create a new object each time they are invoked
3) return an object of any subtype of their return type
4) reduce the verbosity of creating parameterized type instances.(for example: newInstance() method)


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ËãÊõÒì³£ÀࣺArithmeticExecption
¿ÕÖ¸ÕëÒì³£ÀࣺNullPointerException
ÀàÐÍÇ¿ÖÆת»»Òì³££ºClassCastException
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class Link
{
private Node head;
public Link(Node head)
{
this.head=head;
}
public void addNode(Node node)
{
Node p=head;
while(true)
{
if(!p.hasNext())
{
p.setNext(node);
break;
}
p=p.getNext();
}
}
//²åÈë½Ú
public void insertNode(Node p,Node q)
{
q.setNext(p.getNext());
p.se ......
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