帮忙看看有什么问题

Question

class Student implements Cloneable
{
      String a;
      int b;
     Student(String a,int b)
        {
              this.a=a;
              this.b=b; 
        }
    public Object clone()
         {
             Object o=null;
                  try
               {            
             o=super.clone();
               }
                  catch(CloneNotSupportedException e)
               {
                System.out.println(e.toString());
               }
                return o;           
         }
}
class Test
{
      public static void main(String [] args)
         {
              Student a=new Student("nihao",2);
              Student b=(Student)a.clone();
         }
}
编译没错 ,执行抛出java.lang.NoClassDefFoundError错误 哪里错了?

Answer 1

带有main方法的类应该要public的吧

Answer 2

呵呵！你保存的文件名不是 Test.java吧！

Answer 3

第二，使用 
java -cp . Test
来执行， 
-cp . 
指定当前路径为CLASSPATH