NullPointerException异常创建对象的数组时， [英] NullPointerException when Creating an Array of objects

问题描述

我一直在试图创建一个包含两个值的类的数组，但是当我尝试将值应用于数组我得到一个NullPointerException异常。

I have been trying to create an array of a class containing two values but when I try to apply a value to the array I get a NullPointerException.

public class ResultList {
    public String name;
    public Object value;

    public ResultList() {}
}

public class Test {
    public static void main(String[] args){
        ResultList[] boll = new ResultList[5];
        boll[0].name = "iiii";
    }
}

为什么会出现这个错误，我该如何解决这个问题？

Why am I getting this error and how can I fix it?

推荐答案

您创建数组，但没有放任何东西在里面，所以你有一个包含5个元素，所有这一切都是空的数组。你可以添加

You created the array but didn't put anything in it, so you have an array that contains 5 elements, all of which are null. You could add

boll[0] = new ResultList();

你设置铃前行[0]。名称。

before the line where you set boll[0].name.

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