帮忙看看这个程序运行时出现的问题
package   hello.eava;
public   class   SeqListTest2
{
private   long   number;//学号
private   String   name;//学生名字
private   String   sex;//性别
private   int   age;//年龄

SeqListTest2(long   number,String   name,String   sex,int   age)//构造函数
{
this.number   =   number;
this.name   =   name;
this.sex   =   sex;
this.age   =   age;
}

public   long   getNumber()
{
return   number;
}
public   String   getName()
{
return   name;
}

public   String   getSex()
{
return   sex;
}
public   int   getAge()
{
return   age;
}

public   static   void   main(String[]   args)  
{
SeqListTest2   s   =   new   SeqListTest2(2000001, "张三 ", "男 ",20);
SeqListTest2   s1   =   new   SeqListTest2(2000001, "李四 ", "男 ",21);
SeqListTest2   s2   =   new   SeqListTest2(2000001, "王五 ", "男 ",22);
/*try
{
for   (int   i   =   0;i <n   ;i++   )
{
S.insert(i,student[i]);//........
}
for   (int   i   =   0;i <S.size   ;i++   )
{
Student   st   =   (Student)seqList.getData(i);//...........
System.out.println(st.getNumber()+ "   "+st.getName()
+ "   "+st.getSex()+ "   "+st.getAge());//.........
}
}
catch   (Exception   e)
{
System.out.println(e.getMessage());
}
*/
System.out.println(s.toString());
System.out.println(s1.toString());
System.out.println(s2.toString());
}
}
运行的时候出现以下;
Exception   in   thread   "main "   java.lang.NoClassDefFoundError:   SeqListTest2   (wrong   n
ame:   hello/eava/SeqListTest2)
                at   java.lang.ClassLoader.defineClass1(Native   Method)
                at   java.lang.ClassLoader.defineClass(ClassLoader.java:620)
                at   java.security.SecureClassLoader.defineClass(SecureClassLoader.java:12
4)
                at   java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
                at   java.net.URLClassLoader.access$100(URLClassLoader.java:56)
                at   java.net.URLClassLoader$1.run(URLClassLoader.java:195)
                at   java.security.AccessController.doPrivileged(Native   Method)
                at   java.net.URLClassLoader.findClass(URLClassLoader.java:188)
                at   java.lang.ClassLoader.loadClass(ClassLoader.java:306)
                at   sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268)
                at   java.lang.ClassLoader.loadClass(ClassLoader.java:251)
                at   java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)