java 将集合转换为 int 数组
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Conversion of collection to int array
提问by Xara
I want to display a graph and for displaying that i need integer values.I get this from my code
我想显示一个图形并显示我需要整数值。我从我的代码中得到这个
Collection c = Sort.values();
Is there any way that i convert collection in such a way that i get integer values?i get this when i print the collection c
有什么方法可以让我以得到整数值的方式转换集合？我在打印集合 c 时得到这个
[64770, 26529, 13028, 848, 752, 496]
回答by dasblinkenlight
Assuming the values are of type Integer, you can try this:
假设值是 type Integer，你可以试试这个：
Collection c = Sort.values();
Integer[] a = (Integer[])(c.toArray(new Integer[c.size()]));
回答by Mattias Isegran Bergander
for (Integer value : c) {
int i = value.intValue();
//do something with either value or i
}
回答by Amr Lotfy
Simply:
简单地：
Integer[] yourArrayVar = yourCollectionVar.toArray(new Integer[0]);
java just needs to know what kind of array to produce.
java只需要知道要生成什么样的数组。
回答by Kaplan
The question was:conversion to intarrayInteger[]can not be assigned to int[]or vice versa
问题是：转换为int数组Integer[]不能赋值，int[]反之亦然
int[] array = c.stream().mapToInt( i -> i ).toArray();
