我正在编写代码以使用并发线程添加随机元素数组。我想我已经弄清楚了，代码编译没有错误，但是当我运行它时，我得到了超出范围的错误索引，并且找不到问题。
导入java.util。*; 导入java.util.concurrent.atomic.AtomicLong;
公共类总和{
private static final Random RAND = new Random(42);
static AtomicLong total;
public static int[] Random(int length)
{
int[] a = new int[length];
for (int i = 0; i < a.length; i++)
{
a[i] = RAND.nextInt(250_000_000);
}
return a;
}
static class Adder implements Runnable
{
int[] array;
int lo;
int up;
int length = 250_000_000;
int minsum = 0;
Adder(int[] array, int lo, int up)
{
this.array = array;
this.lo = lo;
this.up = up;
}
public void run()
{
for(int i = lo; i < up; i+=1)
{
minsum += array[i];
}
total.getAndAdd(minsum);
}
}
public static void main(String[] args) throws Throwable
{
int length = 250_000_000;
long end = 0;
long start = 0;
int i;
int[] a = Random(length);
int threadCount= 1;
start = System.currentTimeMillis();
for(i=1; i<=100; i++)
{
if (length %i == 0)
threadCount = i;
int size = length / threadCount;
Thread[] threads = new Thread[threadCount];
for (int j = 1; j <= threadCount; j++)
{
Adder add = new Adder(a, j*size, ((j+1)*size));
threads[i] = new Thread(add);
threads[i].start();
}
for (int t = 1; t <= threadCount; t++)
{
threads[i].join();
}
end = System.currentTimeMillis();
System.out.println(" Using " + i + " threads \n The sum is " + total);
System.out.println(" The computation took: " + (end - start));
total.set(0);
}
}
}