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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import java.io.*;
public class QueueArray {
Object[] a; //¶ÔÏóÊý×飬¶ÓÁÐ×î¶à´æ´¢a.length-1¸ö¶ÔÏó
int front; //¶ÓÊ×ϱê
int rear; //¶Óβϱê
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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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void notify()
  ......