无法在java中使用长值初始化布尔数组？

Question

我要做的是初始化布尔数组，数组的大小是长值

public static  List<Integer> primesUpTo(long target) {

         boolean[] nonPrime = new boolean[target];

}

我遇到以下错误：

possible loss of precision
         boolean[] nonPrime = new boolean[target];
                                          ^
  required: int
  found:    long

有人能解释一下为什么我不能使用长值初始化布尔数组，也不能增加长值，比如：Boolean[]nonPrime=new Boolean[target+1]也不工作。谢谢你提前通知

Answer 1

这是一种语言限制

Java has been criticized for not supporting arrays of more than 2^31−1 (about 2.1 billion) elements.[17][18][19] This is a limitation of the language; the Java Language Specification, Section 10.4, states that:

Arrays must be indexed by int values... An attempt to access an array component with a long index value results in a compile-time error.[20]

https://en.m.wikipedia.org/wiki/Criticism_of_Java#Large_arrays

在这里可以找到答案：Do Java arrays have a maximum size?