java - 将新项目添加到字符串数组

Question

我有一个基本字符串数组

String[] array = {
        "AAA",
        "BBB",
        "CCC"
    };

现在我想向其中添加一个新项目

array[array.length + 1] = "DDD"

运行应用程序后它崩溃了。

Answer 1

An array is a container object that holds a fixed number of values of a single type. The length of an array is established when the array is created. After creation, its length is fixed.

Java docs

如果您想动态更改大小，那么您应该使用 ArrayList

或者您也可以使用HashMap

Android docs on ArrayList