java - 在承包商中初始化未知大小的ArrayList - Java

Question

每当创建新实例时，我都希望用字符串值填充构造函数中的数组。当我尝试创建实例时，我的代码中出现以下错误。

Array initialiser not allowed here.

主类

public static void main(String[] args) {
    .....
    Activities coldDrink = new Activities("string", 1, 1, {"string", "stringOne", "stringTwo"});
    ....
}

Activity 类

public class Activities {
  private String activityName;
  private int numberEssentialSensors;
  private int numberOptionalSensors;
  private ArrayList sensorList = null;


  Activities(String actName, int essSensors, int optSensors, ArrayList arrayValues) {
    this.activityName = actName;
    this.numberEssentialSensors = essSensors;
    this.numberOptionalSensors = optSensors;
    this.sensorList = arrayValues;

  }

Answer 1

{"string", "stringOne", "stringTwo"}是一个数组初始化表达式，而不是 ArrayList 。您可以使用new ArrayList(Arrays.asList("string", "stringOne", "stringTwo"))相反。

最好使用ArrayList<String>而不是原始类型。

Activities coldDrink = new Activities("string", 1, 1, new ArrayList<String>(Arrays.asList("string", "stringOne", "stringTwo"));