ChineseTony commented on PR #7844:
URL: https://github.com/apache/rocketmq/pull/7844#issuecomment-1960819129
```java
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Fork;
import org.openjdk.jmh.annotations.Measurement;
import org.openjdk.jmh.annotations.Mode;
import org.openjdk.jmh.annotations.OutputTimeUnit;
import org.openjdk.jmh.annotations.Param;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.Setup;
import org.openjdk.jmh.annotations.State;
import org.openjdk.jmh.annotations.Warmup;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.TimeUnit;
@BenchmarkMode(Mode.Throughput)
@Warmup(iterations = 3, time = 1)
@Measurement(iterations = 5, time = 3)
@Fork(1)
@State(value = Scope.Benchmark)
@OutputTimeUnit(TimeUnit.SECONDS)
public class Test {
@Param({"0", "1", "10", "100", "1000"})
int size;
List<Integer> list;
@Setup
public void setup() {
list = new ArrayList<>();
for (int i = 0; i < size; i++) {
list.add(i);
}
}
@Benchmark
public Object[] simple() {
return list.toArray();
}
@Benchmark
public Integer[] zero() {
return list.toArray(new Integer[0]);
}
@Benchmark
public Integer[] sized() {
return list.toArray(new Integer[list.size()]);
}
}
```
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