diff --git a/s-day05/src/com/inmind/exception01/Demo04.java b/s-day05/src/com/inmind/exception01/Demo04.java
new file mode 100644
index 0000000..97e3792
--- /dev/null
+++ b/s-day05/src/com/inmind/exception01/Demo04.java
@@ -0,0 +1,21 @@
+package com.inmind.exception01;
+
+import java.util.Objects;
+
+/*
+Objects里面的requireNonNull方法(了解)
+JDK源码中，它也使用通过throw主动抛出一个异常，而不是让JVM抛出
+
+总结，该API就是提醒大家，要自己抛出异常，那就用throw关键字
+ */
+public class Demo04 {
+    public static void main(String[] args) {
+        String str = null;
+        /*if (str == null) {
+            throw new NullPointerException("str is null");
+        }*/
+        Objects.requireNonNull(str,"str is null,jdk的api实现的");
+
+        System.out.println("程序结束");
+    }
+}