java - else 语句多次打印 - 数组循环

Question

我希望我的代码循环遍历一个数组，并且仅在数组中有值时才为用户提供删除学生的选项。如果所有数组值都为空，那么我希望它打印出一条消息。问题是我的消息针对数组中的每个空元素多次打印。

我的代码:

  static void deleteStudent() {
    for (int i = 0;i < 10;i++) {
      if (studentNamesArray[i] != null) {
        System.out.println("Which student would you like to delete?");
        System.out.println(i + ": " + studentNamesArray[i]);
        int studentChoice = input.nextInt();
        for (i = studentChoice + 1;i < studentNamesArray.length; i++) {
          studentNamesArray[i-1] = studentNamesArray[i];
        }
        nameArrayCount = nameArrayCount -1;
        studentNamesArray[studentNamesArray.length - 1] = null;
        for(i = studentChoice + 1;i < 9;i++) {
          for(int y = 0;y < 3;y++) {
            studentMarksArray[i-1][y] = studentMarksArray[i][y];
          }
        }
        markArrayCount = markArrayCount - 1;
        for(int y = 0;y < 3;y++) {
          studentMarksArray[9][y] = 0;
        }
      } else {
          System.out.println("There are no students stored");
      }
    }
  }

Answer 1

else block 在每次循环迭代中运行。如果您只想在最后运行一次，请执行以下操作:

boolean studentFound = false;

for (int i = 0;i < 10;i++) {
    if (studentNamesArray[i] != null) {
        studentFound = true;
...

然后在for之后:

if (!studentFound) {
    System.out.println("There are no students stored");
}