学步园

class Employee {
           String name,id,post;
           long salary;
          public   Employee(String name,String id,String post,long salary){      
            this.name=name;
            this.id=id;
            this.post=post;
            this.salary=salary;}
          void changePost(String newPost) {
             post=newPost;
            }
         void changeSalary(long dev){
             salary=salary+dev;
            }
            void print(){
             System.out.print("工号"+id+"姓名"+name);
             System.out.print("职务："+post+"月薪："+salary);
           
           
           }
           public class EmployeeDemo{
            public static void main (String[] args){
             Employee a=new Employee("小于","0029","部门经理",9000);     
             Employee b=new Employee("蚂蚁"，"0066"，"部门副经理"，6000);
             Employee c=new Employee("网页"，"0633"，"职员"，3000);
             a.print();
             b.print();
             c.print();
             a.changePost("副总经理");
             b.changeSalary(3000);
             c.changePost("职员");
             b.changeSalary(-3000);
             c.changePost("部门副经理");
             c.changeSalary(3000);
             System.out.println("调整岗位和月薪后：");
             a.print();
             b.print();
             c.print();
            }
           }
          
}
1-如果我在public   classEmployee(String name,String id,String post,long salary){ 就会发生错误（加入class之后），为什么？

2-Employee a=new Employee("小于","0029","部门经理",9000);     错误!哪儿错
             Employee b=new Employee("蚂蚁"，"0066"，"部门副经理"，6000);
             Employee c=new Employee("网页"，"0633"，"职员"，3000);