get supper class (examplehub#161)

* get supper class

* Formatted with Google Java Formatter

Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>

Author: realDuYuanChao

src/main/java/com/examplehub/basics/reflection/GetSupperClass.java

@@ -0,0 +1,3 @@
+package com.examplehub.basics.reflection;
+
+public class GetSupperClass {}

src/test/java/com/examplehub/basics/reflection/GetSupperClassTest.java

@@ -0,0 +1,15 @@
+package com.examplehub.basics.reflection;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import org.junit.jupiter.api.Test;
+
+class GetSupperClassTest {
+  @Test
+  void test() {
+    Class cls = Integer.class;
+    assertEquals(Number.class, cls.getSuperclass());
+    assertEquals(Object.class, cls.getSuperclass().getSuperclass());
+    assertEquals(null, cls.getSuperclass().getSuperclass().getSuperclass());
+  }
+}