JavaVsKotlin2

Java.java

ArrayList<Student> students = new ArrayList<Student>() {{
            add(new Student("John", 0));
            add(new Student("Julia", 2));
            add(new Student("Matt", 1));
            add(new Student("Katie", 0));
            add(new Student("Dan", 0));
}};

ArrayList<Student> firstList = new ArrayList<>();
ArrayList<Student> secondList = new ArrayList<>();

for (Student student: students) {
    boolean isFirstFilled = firstList.size() >= 3;
    boolean isSecondFilled = secondList.size() >= 2;

    if (isFirstFilled && isSecondFilled) break;
    int mark = student.getMark();
    if (mark == 0 && !isFirstFilled) {
        firstList.add(student);
    } else if (mark == 1 && !isSecondFilled) {
        secondList.add(student);
    }
}

Kotlin.kt

var students = listOf(
  Student("John", 0), 
  Student("Julia", 2), 
  Student("Matt", 1),
  Student("Katie", 0), 
  Student("Dan", 0)
)

var firstList = students.filter { it.mark == 0 }.take(3)
var secondList = students.filter { it.mark == 1 }.take(2)

Вот за это я и люблю Лotlin. Коротко - ясно!