创建对象数组时出现 NullPointerException

问题描述

我一直在尝试创建一个包含两个值的类的数组，但是当我尝试将一个值应用于该数组时，我得到了一个 NullPointerException.

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

为什么我会收到此异常，我该如何解决?

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

推荐答案

您创建了数组但没有在其中放入任何内容，因此您有一个包含 5 个元素的数组，所有元素都为空.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();

在您设置 boll[0].name 的行之前.

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

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