云在天边看世界

最近一段时间我开始在学校学习JAVA基本编程技术，在学习之余，抽点时间来分享一点基础知识。

Java类中的静态变量在程序运行期间，其内存空间对所有该类的对象实例而言是共享的，有些时候可以认为是全局变量。因此在某些时候为了节省系统内存开销、共享资源，可以将类中的一些变量声明为静态变量，通过下面的例子，你可以发现合理应用静态变量带来的好处：

  
 public class WeekA{   
   
        static class Data {    
   
              private int week;   
               private String name;   
               Data(int i, String s) {   
                     week= i;   
                     name = s;   
               }   
         }   
    
         Data weeks[] = {   
               new Data(1, "Monday"),   
               new Data(2, "Tuesay"),   
               new Data(3, "Wednesday"),   
               new Data(4, "Thursday"),   
               new Data(5, "Friday"),   
               new Data(6, "Saturday"),   
               new Data(7, "Sunday")   
         };   
    
         public static void main(String args[]) {   
    
               final int N = 10000;   
               WeekA weekinstance;   
               for (int i = 1; i <= N; i++){   
                     weekinstance = new WeekA ();   
               }   
    
         }   
    
  }  
 

 
  public class WeekB{   
    
        static class Data {    
    
               private int week;   
               private String name;   
               Data(int i, String s) {   
                     week= i;   
                     name = s;   
              }   
    
        }   
    
        static Data weeks[] = {   
               new Data(1, "Monday"),   
               new Data(2, "Tuesay"),   
               new Data(3, "Wednesday"),   
               new Data(4, "Thursday"),   
               new Data(5, "Friday"),   
               new Data(6, "Saturday"),   
               new Data(7, "Sunday")   
        };   
    
        public static void main(String args[]) {   
    
               final int N = 10000;   
               WeekB weekinstance;   
               for (int i = 1; i <= N; i++){   
                     weekinstance = new WeekB ();   
               }   
       }   
    
  }