java定义动态string数组,我怎样才能申报Java的动态String数组

I am using String Array declare as zoom z[]=new String[422];. But this array stores value from 0 to 32, so I got null pointer exception after looping value 32.

How to solve this problem in java?

How can I declare a dynamic array in java ?

解决方案

You want to use a Set or List implementation (e.g. HashSet, TreeSet, etc, or ArrayList, LinkedList, etc..), since Java does not have dynamically sized arrays.

List zoom = new ArrayList<>();

zoom.add("String 1");

zoom.add("String 2");

for (String z : zoom) {

System.err.println(z);

}

Edit:

Here is a more succinct way to initialize your List with an arbitrary number of values using varargs:

List zoom = Arrays.asList("String 1", "String 2", "String n");