fix code

hutool-core/src/test/java/cn/hutool/core/lang/func/FunctionPoolTest.java

@@ -0,0 +1,39 @@
+package cn.hutool.core.lang.func;
+
+import cn.hutool.core.collection.ListUtil;
+import cn.hutool.core.date.DateUtil;
+import cn.hutool.core.date.StopWatch;
+import cn.hutool.core.util.RandomUtil;
+import org.junit.Test;
+
+import java.util.ArrayList;
+
+public class FunctionPoolTest {
+
+	@Test
+	public void createStringTest() {
+		// 预热
+		FunctionPool.createString("123".toCharArray());
+
+		// 测试数据
+		final ArrayList<char[]> list = ListUtil.of();
+		for (int i = 0; i < 100000; i++) {
+			list.add(RandomUtil.randomString(100).toCharArray());
+		}
+
+		final StopWatch stopWatch = DateUtil.createStopWatch();
+		stopWatch.start("copy creator");
+		for (final char[] value : list) {
+			new String(value);
+		}
+		stopWatch.stop();
+
+		stopWatch.start("zero copy creator");
+		for (final char[] value : list) {
+			FunctionPool.createString(value);
+		}
+		stopWatch.stop();
+
+		//Console.log(stopWatch.prettyPrint());
+	}
+}