Răspuns:
import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;
import java.util.Scanner;
public class Sort {
private static final Scanner scanner = new Scanner(System.in);
public static void main(String[] args) {
List<Integer> numbers = new ArrayList<>();
for (int i = 0;i < 3; i++) {
System.out.print("Introduceti un numar: ");
numbers.add(scanner.nextInt());
}
sortNumbers(numbers);
System.out.println("Numerele sortate:");
for (int val : numbers) {
System.out.println(val);
}
}
private static void sortNumbers(List<Integer> numbers) {
numbers.sort(new Comparator<Integer>() {
@Override
public int compare(Integer o1, Integer o2) {
return getFirstDigit(o1) - getFirstDigit(o2);
}
});
}
private static int getFirstDigit(int num) {
while (num >= 9) {
num /= 10;
}
return num;
}
}
Explicație:
