修复ClassUtil.getTypeArgument() 获取泛型存在null问题

hutool-core/src/main/java/cn/hutool/core/util/TypeUtil.java

@@ -1,5 +1,6 @@
 package cn.hutool.core.util;
 
+import cn.hutool.core.lang.Console;
 import cn.hutool.core.lang.ParameterizedTypeImpl;
 import cn.hutool.core.lang.reflect.ActualTypeMapperPool;
 
@@ -309,7 +310,6 @@ public class TypeUtil {
 	 *
 	 * @param clazz 类
 	 * @return 泛型父类或接口数组
-	 * @since 6.0.0
 	 */
 	public static ParameterizedType[] getGenerics(final Class<?> clazz) {
 		final List<ParameterizedType> result = new ArrayList<>();
@@ -326,8 +326,9 @@ public class TypeUtil {
 		final Type[] genericInterfaces = clazz.getGenericInterfaces();
 		if (ArrayUtil.isNotEmpty(genericInterfaces)) {
 			for (final Type genericInterface : genericInterfaces) {
-				if (genericInterface instanceof ParameterizedType) {
-					result.add((ParameterizedType) genericInterface);
+				final ParameterizedType parameterizedType = toParameterizedType(genericInterface);
+				if(null != parameterizedType){
+					result.add(parameterizedType);
 				}
 			}
 		}

hutool-core/src/test/java/cn/hutool/core/util/Issue3516Test.java

@@ -0,0 +1,36 @@
+package cn.hutool.core.util;
+
+import cn.hutool.core.lang.Console;
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.lang.reflect.Type;
+import java.util.function.Function;
+
+public class Issue3516Test {
+
+	@Test
+	public void getTypeArgumentTest() {
+		final Type typeArgument = TypeUtil.getTypeArgument(Demo.class, 0);
+		Assert.assertEquals(B.class, typeArgument);
+	}
+
+	static class Demo implements A2B{
+		@Override
+		public A apply(B arg0) {
+			final A a = new A();
+			return a;
+		}
+	}
+
+	static class A {
+		private String name;
+	}
+
+	static class B {
+		private String name;
+	}
+
+	interface A2B extends Function<B, A> {
+	}
+}