diff --git a/src/main/java/com/zeekling/exten/ExtendsTest.java b/src/main/java/com/zeekling/exten/ExtendsTest.java
new file mode 100644
index 0000000..ef69307
--- /dev/null
+++ b/src/main/java/com/zeekling/exten/ExtendsTest.java
@@ -0,0 +1,36 @@
+package com.zeekling.exten;
+
+/**
+ * @author zeekling
+ * @apiNote https://www.nowcoder.com/question/next?pid=30695833&qid=15977&tid=44372102
+ * @since 2021-05-16
+ */
+public class ExtendsTest {
+
+    public static void main(String[] args) {
+        Base base = new Son();
+        base.method();
+        //base.methodB();
+    }
+
+}
+
+class Base
+{
+    public void method()
+    {
+        System.out.println("Base");
+    }
+}
+class Son extends Base
+{
+    public void method()
+    {
+        System.out.println("Son");
+    }
+
+    public void methodB()
+    {
+        System.out.println("SonB");
+    }
+}
diff --git a/src/main/java/com/zeekling/thread/ThreadTest.java b/src/main/java/com/zeekling/thread/ThreadTest.java
new file mode 100644
index 0000000..54786dc
--- /dev/null
+++ b/src/main/java/com/zeekling/thread/ThreadTest.java
@@ -0,0 +1,25 @@
+package com.zeekling.thread;
+
+/**
+ * @author zeekling
+ * @apiNote https://www.nowcoder.com/question/next?pid=30695833&qid=4339&tid=44372102
+ * @since 2021-05-16
+ */
+public class ThreadTest {
+
+    public static void main(String args[]) {
+        Thread t = new Thread() {
+            public void run() {
+                dianping();
+
+            }
+        };
+        t.run();
+        System.out.print("dazhong");
+    }
+
+    static void dianping() {
+        System.out.print("dianping");
+    }
+
+}