java - toString() 方法问题

Question

我一直在处理这个任务，这里的代码:

public class Student
{
 private String fname;
 private String lname;
 private String studentId;
 private double gpa;

 public Student(String studentFname,String studentLname,String stuId,double studentGpa)
 {
  fname     = studentFname;
  lname     = studentLname;
  studentId = stuId;
  gpa       = studentGpa;
 }

 public double getGpa()
 {
  return gpa;
 }

 public String getStudentId()
 {
  return studentId;
 }

 public String getName()
 {
  return lname + ", " + fname;
 }
 public void setGpa(double gpaReplacement)
 {
  if (gpaReplacement >= 0.0 && gpaReplacement <= 4.0)
   gpa = gpaReplacement;
  else
   System.out.println("Invalid GPA! Please try again.");
  System.exit(0);
 }
}

现在我需要创建一个 toString() 方法，该方法返回一个格式如下的字符串:

Name: Wilson, Mary AnnID number: 12345GPA: 3.5

Answer 1

@Override
public String toString() {
    return "Name: " + getName() + "\n" +
            "ID Number: " + studentId + "\n" +
            "GPA: " + gpa;
}