The document provides a Java class definition for managing student data, specifically focusing on reading student information from a text file into array structures without using ArrayList. It includes a constructor for the Student class and methods for setting attributes like name, ID, grades, and courses. The code attempts to read lines from a file, parse them, and populate student objects and course data, though it shows some coding issues that need correction.

1. I have a Student.java class constructor like this:
And I need to read a text file that has information like this:
How can I read data from this file to an array (no arraylist) using loops? My code doesn't work.
Here's what I have so far:
Thanks in advance!
Solution
Correct Code:
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.lang.reflect.Array;
public class Student {
private String lastName;
private String FirstName;
private String idNo;
private Course courseArray[];
private String grade;
private double gpa;
static int filecouses=0;
public static Course courses[] = new Course[100];
public Student(String lastName,String FirstName,String idNo,Course[] courses,String
grade,double gpa)
{
this.setLastName(lastName);
this.setFirstName(FirstName);
this.setIdNo(idNo);
this.setcourseArray(courses);
this.setGrade(grade);
this.setGpa(gpa);
}

2. public Student(){
}
public static void main(String[] args) throws IOException {
FileReader file=new FileReader("student.txt");
BufferedReader br=new BufferedReader(file);
String inputLine=br.readLine();
String nines="-999";
while(inputLine!=null)
{
if(!(inputLine.equals(nines))){
Student s=new Student();
String[] arr=inputLine.split(",");
s.setLastName(arr[0]);
System.out.println(arr[0]);
s.setFirstName(arr[1]);
s.setIdNo(arr[2]);
inputLine=br.readLine();}
while((inputLine!=null)&&!(inputLine.equals(nines))){
String[] ar=inputLine.split(",");
System.out.println(ar[0]);
String course=(ar[0]);
String credits=(ar[1]);
String grade=(ar[2]);
Course c=new Course(course, credits, grade);
/*System.out.println(filecouses);
System.out.println(c);
System.out.println(inputLine);*/
inputLine=br.readLine();
courses[filecouses++]=c;

3. }
if(inputLine.equals(nines)){
inputLine=br.readLine();
String[] a=inputLine.split(",");
Student st=new Student();
st.setGpa(Double.parseDouble(a[1]));
st.setGrade(a[0]);
inputLine=br.readLine();
}
}
}
String getLastName() {
return lastName;
}
void setLastName(String lastName) {
this.lastName = lastName;
}
String getFirstName() {
return FirstName;
}
void setFirstName(String firstName) {
FirstName = firstName;
}
String getIdNo() {
return idNo;
}
void setIdNo(String idNo) {
this.idNo = idNo;
}
Course[] getCourses() {

4. return courseArray;
}
void setcourseArray(Course[] courseArray) {
this.courseArray = courseArray;
}
String getGrade() {
return grade;
}
void setGrade(String grade) {
this.grade = grade;
}
double getGpa() {
return gpa;
}
void setGpa(double gpa) {
this.gpa = gpa;
}
}
class Course {
String course;
String credits;
String grade;
public Course(String course,String credits,String grade){
this.course=course;
this.credits=credits;
this.grade=grade;
}
}