CODEWITHSUNDEEP
javaarraylist
Midi_
Midi_

Reputation: 219

Access all elements of an arraylist from an object which is stored in an arraylist (2 Dimentional)

So I have several "student" objects in an arraylist, each student has an arraylist of courses. how do I access all of the courses from a particular student? Thanks in advance.

Scanner studentCourse = new Scanner(System.in);
int j = 0;

System.out.println("Which students course(s) do you want to view?");
for(Student l:listStudent) {
    System.out.print(j+1 + ")");
    System.out.println(l);
    j++;
}
int course = studentCourse.nextInt();

int k = s.listCourse.size();//need this to be the size of the correct array list
int l = 0;

while( l < k ){
    System.out.println(s.listCourse.get(0));//need this to print all of the elements in the correct array list
}

break;

public class Student {

    String studentFirstName, studentLastName;
    int studentID;
    double studentGPA;
    ArrayList<Course> listCourse = new ArrayList<>();

}

Upvotes: 0

Views: 86

Answers (4)

RamGrg
RamGrg

Reputation: 297

You can use getter for course. By using you can do following:

int len = s.listCourse.size();
for(int i = 0; i<=len; i++) {
    System.out.println(s.listCourse.get(i).getCourse());
}

Upvotes: 0

Shishir Kumar
Shishir Kumar

Reputation: 8199

You can use getter & setter methods in your Student class or just you use the for loop, as below.

for(Course course : s.listCourse) {
  System.out.println(course);
}

Upvotes: 1

RaceBase
RaceBase

Reputation: 18868

Your question is very much understandable, but not your code.

Student student = studentList.get(indexPosition); 
//ArrayList gives this flexibility and that's the advantage of ArrayList over other Lists

if(student.getCoursesList()!=null && !student.getCoursesList().isEmpty()){
    for(Course course: student.getCoursesList()){
        System.out.println(course);
    }
}

Upvotes: 1

dting
dting

Reputation: 39307

Look at using for

for (Course course : s.listCourse) {
  System.out.println(course);
}

Upvotes: 1

Related Questions