这个怎么样运行 显示无法加载或找不到主类

package sheji;
public class jieshao { public long id; public String name; public int age; public void sayHello() { String f =“大家好，我是李佳林，学号是30602210227，年龄是18岁”; System.out.printf( f ,name, id,age); } public void sayHello(jieshao s) { String f = “冤情，你好，我是李佳林，学号是30602210227，年龄是18岁”; System.out.printf(f,s,name,id,age); } }