diff --git a/s-day01/src/com/inmind/object01/Demo04.java b/s-day01/src/com/inmind/object01/Demo04.java
new file mode 100644
index 0000000..859d00c
--- /dev/null
+++ b/s-day01/src/com/inmind/object01/Demo04.java
@@ -0,0 +1,20 @@
+package com.inmind.object01;
+
+import java.util.Objects;
+
+/*
+static boolean equals(Object a, Object b) 返回 true如果参数相等，彼此 false否则。
+Objects类的equals方法的作用：实现2个对象是否相同的判断，底层还是使用参数1的equals（重写），有效地避免空指针异常
+ */
+public class Demo04 {
+    public static void main(String[] args) {
+        Student s1 = new Student("李四", 20);
+        Student s2 = new Student("李四", 20);
+        System.out.println(s1.equals(s2));
+//        s1 = null;
+        /*System.out.println(s1.equals(s2));*/
+        System.out.println(Objects.equals(s1, s2));
+
+
+    }
+}