diff --git a/hutool-core/src/main/java/org/dromara/hutool/core/convert/impl/NumberConverter.java b/hutool-core/src/main/java/org/dromara/hutool/core/convert/impl/NumberConverter.java
index 2f09b8488..9983bd09c 100644
--- a/hutool-core/src/main/java/org/dromara/hutool/core/convert/impl/NumberConverter.java
+++ b/hutool-core/src/main/java/org/dromara/hutool/core/convert/impl/NumberConverter.java
@@ -52,6 +52,9 @@ import java.util.function.Function;
 public class NumberConverter extends AbstractConverter {
 	private static final long serialVersionUID = 1L;
 
+	/**
+	 * 单例
+	 */
 	public static final NumberConverter INSTANCE = new NumberConverter();
 
 	@SuppressWarnings("unchecked")
diff --git a/hutool-core/src/test/java/org/dromara/hutool/core/convert/Issue3105Test.java b/hutool-core/src/test/java/org/dromara/hutool/core/convert/Issue3105Test.java
new file mode 100644
index 000000000..91633f10b
--- /dev/null
+++ b/hutool-core/src/test/java/org/dromara/hutool/core/convert/Issue3105Test.java
@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2023 looly(loolly@aliyun.com)
+ * Hutool is licensed under Mulan PSL v2.
+ * You can use this software according to the terms and conditions of the Mulan PSL v2.
+ * You may obtain a copy of Mulan PSL v2 at:
+ *          http://license.coscl.org.cn/MulanPSL2
+ * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
+ * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
+ * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+ * See the Mulan PSL v2 for more details.
+ */
+
+package org.dromara.hutool.core.convert;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+/**
+ * https://github.com/dromara/hutool/issues/3105
+ */
+public class Issue3105Test {
+	@Test
+	void toLongTest() {
+		final Long aLong = Convert.toLong("0.a");
+		Assertions.assertEquals(0L, aLong);
+	}
+}
diff --git a/hutool-core/src/test/java/org/dromara/hutool/core/math/NumberParserTest.java b/hutool-core/src/test/java/org/dromara/hutool/core/math/NumberParserTest.java
new file mode 100644
index 000000000..77cb4b5de
--- /dev/null
+++ b/hutool-core/src/test/java/org/dromara/hutool/core/math/NumberParserTest.java
@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2023 looly(loolly@aliyun.com)
+ * Hutool is licensed under Mulan PSL v2.
+ * You can use this software according to the terms and conditions of the Mulan PSL v2.
+ * You may obtain a copy of Mulan PSL v2 at:
+ *          http://license.coscl.org.cn/MulanPSL2
+ * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
+ * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
+ * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+ * See the Mulan PSL v2 for more details.
+ */
+
+package org.dromara.hutool.core.math;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+public class NumberParserTest {
+	@Test
+	void parseLongTest() {
+		final long value = NumberParser.INSTANCE.parseLong("0.a");
+		Assertions.assertEquals(0L, value);
+	}
+}