Java Scanner如何输入两个数组

import java.util.Scanner;

public class Z {

 public static void main(String[] args) {
  Scanner scanner = new Scanner(System.in);
  int na = scanner.nextInt();
  int nb = scanner.nextInt();
  int[] aa = new int[na];
  int[] bb = new int[nb];
  int i = 0;
  while (scanner.hasNext()) {
   aa[i++] = scanner.nextInt();
   if (i == aa.length) {
    break;
   }
  }
  i = 0;
  while (scanner.hasNext()) {
   bb[i++] = scanner.nextInt();
   if (i == bb.length) {
    break;
   }
  }

  for (int j = 0; j < aa.length; j++) {
   System.out.print(aa[j] + " ");
  }
  System.out.println();
  for (int j = 0; j < bb.length; j++) {
   System.out.print(bb[j] + " ");
  }
 }
}

输入：
3 4
1 2 3
1 2 3 4
输出：
1 2 3 
1 2 3 4