在这篇文章中，我们来探究一下Scala HashMap.put(k, v)以及Java HashMap.put(k, v)的性能。
具体代码没看，以后补充。
Scala HashMap.put(k, v)
测试代码很简单:
package com.hyper
import java.util.concurrent.TimeUnit
import com.google.common.base.Stopwatch
import scala.collection.mutable
object TestScalaMap {
def main(args: Array[String]): Unit = {
val map: mutable.HashMap[String, String] = mutable.HashMap()
val stopWatch = new Stopwatch()
stopWatch.start()
for (i <- 0 until 10000000) {
map.put(i.toString, i.toString)
}
val elapse = stopWatch.elapsed(TimeUnit.SECONDS)
println(elapse)
}
}
运行结果是28s
Java HashMap.put(k, v)
package com.hyper;
import com.google.common.base.Stopwatch;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;
public class TestJavaMap {
public static void main(String[] args) {
Map<String, String> map = new HashMap<>();
Stopwatch stopwatch = new Stopwatch();
stopwatch.start();
for (int i = 0; i < 10000000; i++) {
map.put(String.valueOf(i), String.valueOf(i));
}
long elapse = stopwatch.elapsed(TimeUnit.SECONDS);
System.out.println(elapse);
}
}
运行结果是18s。
