静态构造函数和单例模式

 1 public class A
 2 {      
 3     public static int  s = 1;
 4     public int  uns=2；
 5     private static A instance_;
 6         public static A instance{
 7             get{
 8                 return instance_;
 9             }
10         }
11        
12         static A(){
13             instance_ = new A();
14              abc= 3;//静态成员可以直接赋值
15             instance_.uns=2;//正确
16             //uns=2;会报错，非静态成员要通过类实例调用
17         }  
18 }                              

 1 public class A{
 2         private static A instance_;
 3         public static A instance{
 4             get{
 5                 if(instance_ = null)
 6                     instance_ = new A();
 7                 return instance_;
 8             }
 9         }
10 }