Question

    //adds the Students
         case 1:
              //creates a space
              System.out.println();

              //asks the user to enter their first name
              System.out.print(Util.setLeft(22,"Please enter the student's first name   : "));

              //reads the firstname from the user
              fName = Keyboard.readString();

              //asks the user for their last name
              System.out.print(Util.setLeft(22, "Please enter the student's last name    : "));

              //reads the last name from the user
              lName = Keyboard.readString();

              //asks the user for their last name
              System.out.print(Util.setLeft(22, "Please enter the student semester's name: "));

              //reads the last name from the user
              semName = Keyboard.readString();

              //sends the students information to the StudentInfo class
              student.StudentInfo(fName, lName, semName);

              //creates a space
              System.out.println();

              //exits the switch
              break;



 public void StudentInfo(String fNam, String lNam, String semNam)
     {
         //Local Constants

         //Local variables


  /********************   Start StudentInfo constructor method        *****************/
        this.fName   = fNam;
        this.lName   = lNam;
        this.semName = semNam;




     }//ends the constructor

Answer 1

StudentInfo构造函数方法仅在创建新类时有效。在创建类之后，您无法执行此操作。尝试使用student.setFnam ...

Answer 2

你可以这样做：

StudentInfo sti = StudentInfo(fName, lName, semName);

但是在StudentInfo类中，你必须有一个构造函数来接受这样的数据：

class StudentInfo {
   String fName;
   ...

    public StudentInfo(String fName, String lName, String semName) {
       this.fName = fName;
       ...
    }

}

将数据从驱动程序类传递给构造函数

2 个答案: