# Java `ArrayList isEmpty()`方法 > 原文： [https://beginnersbook.com/2013/12/java-arraylist-isempty-method-example/](https://beginnersbook.com/2013/12/java-arraylist-isempty-method-example/) `java.util.ArrayList`类的`isEmpty()`方法用于检查列表是否为空。此方法返回一个布尔值。 `public boolean isEmpty()` 如果列表为空则返回`true`，否则返回`false`。 ### 例 ```java package beginnersbook.com; import java.util.ArrayList; public class IsEmptyExample { public static void main(String args[]) { //ArrayList of Integer Type ArrayList<Integer> al = new ArrayList<Integer>(); //Checking whether the list is empty System.out.println("Is ArrayList Empty: "+al.isEmpty()); //Adding Integer elements al.add(1); al.add(88); al.add(9); al.add(17); //Again checking for isEmpty System.out.println("Is ArrayList Empty: "+al.isEmpty()); //Displaying elements of the list for (Integer num: al) { System.out.println(num); } } } ``` 输出： ```java Is ArrayList Empty: true Is ArrayList Empty: false 1 88 9 17 ```