Long型id数据对应MySQL数据库中 bigint 数据类型;
System.out.println(1==1L); //ture
System.out.println(1L); //1
System.out.println(1L+"2"); //12
Long型id数据对应MySQL数据库中 bigint 数据类型;
System.out.println(1==1L); //ture
System.out.println(1L); //1
System.out.println(1L+"2"); //12