为什么System.out.println(s1.schoolName);打印的结果是Tsinghua？

Question

class test
{
   String name;
   static String schoolName;

   public static void main(String args[])
   {
    test s1=new test();
      s1.name="张三";
      s1.schoolName="gdgm";

      test s2=new test();
      s2.name="Tom";
      s2.schoolName="Tsinghua";

      System.out.println(s1.name);      
      System.out.println(s1.schoolName);

   }
}

Answer 1

因为你写的schoolName是个类成员，全局变量

Answer 2

schoolName是static的,所有的test类实例的schoolName都是相同的;s2.schoolName="Tsinghua";执行后s1.schoolName自然也是Tsinghua