langs-performance/java-optimizations/LinkedList.diff

31 lines
950 B
Diff

--- ../primes.java 2016-09-22 22:10:58.787516331 +0300
+++ primes.java 2016-09-22 22:11:14.919516331 +0300
@@ -2,15 +2,15 @@
import java.lang.Math;
class PrimeNumbersGenerator {
- ArrayList<Integer> get_primes7(int n) {
- ArrayList<Integer> res = new ArrayList<Integer>();
+ List<Integer> get_primes7(int n) {
+ List<Integer> res = new LinkedList<Integer>();
if (n < 2) return res;
if (n == 2) {
res.add(2);
return res;
}
- ArrayList<Integer> s = new ArrayList<Integer>();
+ List<Integer> s = new ArrayList<Integer>();
for (int i = 3; i < n + 1; i += 2) {
s.add(i);
}
@@ -46,7 +46,7 @@
long startTime = System.currentTimeMillis();
long periodTime = Long.parseLong(System.getenv("RUN_TIME"), 10) * 1000;
- ArrayList<Integer> res;
+ List<Integer> res;
while ((System.currentTimeMillis() - startTime) < periodTime) {
res = (new PrimeNumbersGenerator()).get_primes7(10000000);