Check if the list is empty in Java.

1 year ago
Ava Mitchell
1 minute

In Java, you can use the following method to check if a list is empty:

  1. The isEmpty() method can be used in list classes (like ArrayList, LinkedList, etc.) to check if the list is empty. For example:
List<String> list = new ArrayList<>();
if (list.isEmpty()) {
    System.out.println("列表为空");
} else {
    System.out.println("列表不为空");
}
  1. By using the size() method: The size() method of the list class returns the number of elements in the list, and by checking if the count is zero, you can determine if the list is empty. For example:
List<String> list = new ArrayList<>();
if (list.size() == 0) {
    System.out.println("列表为空");
} else {
    System.out.println("列表不为空");
}

Both methods can be used to determine if the list is empty, choose based on personal preference.

bannerAds