How to display nested array by constructor pattern?

Question

Java

public class Group {
    private String name;
    private Student[] students;

    public Group(String name, Student[]students ) {
        this.name = name;
        this.students = students;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

Group group1 = new Group("KIT-25", new Student[]{
                new Student("Max", 20),
                new Student("Misha", 21),
                new Student("Vitya", 19),
                new Student("Alyona", 20),
                new Student("Ira", 19)
        });
System.out.println( ? );

Answer 1

Hello!
You forgot to create a getter for Student[] studentsGetter get an array and iterate over it with a for loop

public class Group {

    private String name;
    private Student[] students;

    public Group(String name, Student[]students ) {
        this.name = name;
        this.students = students;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Student[] getStudents() {
        return students;
    }

    public void setStudents(Student[] students) {
        this.students = students;
    }

}

class Student {

    private String name;
    private int age;

    public Student(String name, int age) {
        this.name = name;
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    @Override
    public String toString() {
        return "Student{" +
                "name='" + name + '\'' +
                ", age=" + age +
                '}';
    }
    
}

class Test {

  public static void main(String[] args) {

      Group group1 = new Group("KIT-25", new Student[]{
              new Student("Max", 20),
              new Student("Misha", 21),
              new Student("Vitya", 19),
              new Student("Alyona", 20),
              new Student("Ira", 19)
      });

      // Вариант №1
      for (Student student : group1.getStudents()) {
        System.out.println(student.getName());
      }

      // Вариант №2 (Stream API)
      Arrays.stream(group1.getStudents()).forEach(System.out::println);

  }

}

Answer 2

You need to add a getter for the array of students in the Group:

public String getStudents() {
  return students;
}

And then the access will be something like this:

for (Student student : group1.getStudents()) {
   System.out.println( student.getName() );
 }