static关键字及内存图

static关键字及内存图

• A：没有加静态static的代码示例及内存图解

  class Demo1_Static{
      public static void main(String[] args){
          Person p1 = new Person();
          p1.name = "苍老师";
          p1.country = "日本";
          p1.speak();
          Person p2 = new Person();
          p2.name = "小泽老师";
          p2.country = "日本";
          p2.speak();
      }
  }
  class Person{
      String name;
      String country;
      public void speak(){
          System.out.println(name + "..." + country);
      }
  }
  

  

• B：添加静态static的代码示例及内存图解

  class Demo1_Static{
      public static void main(String[] args){
          Person p1 = new Person();
          p1.name = "苍老师";
          p1.country = "日本";
          Person p2 = new Person();
          p2.name = "小泽老师";
          p1.speak();
          p2.speak();
      }
  }
  class Person{
      String name;
      static String country;
      public void speak(){
          System.out.println(name + "..." + country);
      }
  }
  

  

静态static的好处：

多个对象，共享一份，节约内存。