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)
相关文档:
create PROCEDURE pagelist
@tablename nvarchar(50),
@fieldname nvarchar(50)='*',
@pagesize int output,--每页显示记录条数
@currentpage int output,--第几页
@orderid nvarchar(50),--主键排序
@sort int,--排序方式,1表示升序,0表示降序排列
......
算术异常类:ArithmeticExecption
空指针异常类:NullPointerException
类型强制转换异常:ClassCastException
数组负下标异常:NegativeArrayException
数组下标越界异常:ArrayIndexOutOfBoundsException
违背安全原则异常:SecturityException
文件已结束异常:EOFException
文件未找到异常:FileNotFound ......
class Node
{
private Object obj;
private Node next;
//用数据域构造一个节点对象
public Node(Object obj)
{
this.obj=obj;
}
//返回下一节点的对象
public Node getNext()
{
return this.next;
}
//设置本节点的链域
public void setNext(Node next)
{
this.next=next;
}
//返回节点的数 ......
java 代码实现
public static boolean isLetter(char c) {
int k = 0x80;
return c / k == 0 ? true : false;& ......