Java错误意想不到的类型要求：变量;发现：在一个ArrayList值 [英] Java Error unexpected type required: variable; found: value in an ArrayList

问题描述

我试图与分配元素大小随机的ArrayList数组，填充
0到100之间的随机值

I am trying to allocate a random ArrayList array with size elements, fill with random values between 0 and 100

这是我一直在收到错误块

This is the block that I keep getting the error in

public static ArrayList<Integer> generateArrayList(int size)
{
    // Array to fill up with random integers
    ArrayList<Integer> rval = new ArrayList<Integer>(size);

    Random rand = new Random();

    for (int i=0; i<rval.size(); i++)
    {
        rval.get(i) = rand.nextInt(100);
    }

    return rval;
}

我试过.SET和不用彷徨方法，但他们都不似乎工作

I've tried the .set and .get methods but neither of them seem to work

我不断收到所需的错误意想不到的类型：变量;发现：值

I keep getting the error unexpected type required: variable; found: value

这是在不用彷徨引发错误（我）

It is throwing the error at .get(i)

推荐答案

替换

rval.get(i) = rand.nextInt(100);

与

rval.add(rand.nextInt(100));

另外，为循环将迭代0次的 rval.size（）被使用，因为列表最初空。它应该使用参数尺寸来代替。当您使用初始化新的ArrayList＆LT名单;整数GT;（大小），你只设置它的初始容量的。该列表仍是空的那一刻。

Also the for loop will iterate zero times when rval.size() is used because the list is initially empty. It should use the parameter size instead. When you initialize the list using new ArrayList<Integer>(size), you are only setting its initial capacity. The list is still empty at that moment.

for (int i = 0; i < size; i++)

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