From 20598812d017cd90ec005bae648776a4f712ca1f Mon Sep 17 00:00:00 2001
From: xuxin <840198532@qq.com>
Date: Sat, 8 Aug 2026 10:51:42 +0800
Subject: [PATCH] =?UTF-8?q?s-day07-=E8=87=AA=E5=AE=9A=E4=B9=89=E5=87=BD?=
 =?UTF-8?q?=E6=95=B0=E5=BC=8F=E6=8E=A5=E5=8F=A3?=
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---
 .../com/inmind/functional_interface02/Demo04.java | 15 +++++++++++++++
 .../MyIFunctionalnterface.java                    | 13 +++++++++++++
 2 files changed, 28 insertions(+)
 create mode 100644 s-day07/src/com/inmind/functional_interface02/Demo04.java
 create mode 100644 s-day07/src/com/inmind/functional_interface02/MyIFunctionalnterface.java

diff --git a/s-day07/src/com/inmind/functional_interface02/Demo04.java b/s-day07/src/com/inmind/functional_interface02/Demo04.java
new file mode 100644
index 0000000..6a201e4
--- /dev/null
+++ b/s-day07/src/com/inmind/functional_interface02/Demo04.java
@@ -0,0 +1,15 @@
+package com.inmind.functional_interface02;
+/*
+函数式接口的概念
+函数式接口在Java中是指：有且仅有一个抽象方法的接口。(今后自定义的主要的情况)
+函数式接口:有且仅有一个必须被重写的抽象方法的接口.
+
+注意:在java使用一个注解@FunctionalInterface来验证指定的接口是否是函数式接口
+
+
+扩展:为何在一个接口中某些抽象方法不需要被重写??
+在一个类中如果单继承和多实现,单继承的方法优先级高于接口中的方法定义,导致父类方法中
+如果有跟接口中重名的方法实现的话,那么就相当于在子类中默认重写了接口的方法
+ */
+public class Demo04 {
+}
diff --git a/s-day07/src/com/inmind/functional_interface02/MyIFunctionalnterface.java b/s-day07/src/com/inmind/functional_interface02/MyIFunctionalnterface.java
new file mode 100644
index 0000000..efef907
--- /dev/null
+++ b/s-day07/src/com/inmind/functional_interface02/MyIFunctionalnterface.java
@@ -0,0 +1,13 @@
+package com.inmind.functional_interface02;
+
+@FunctionalInterface
+public interface MyIFunctionalnterface {
+//    void method();
+//    void method(int a);
+//    int method(int a);
+    int method();
+
+    boolean equals(Object obj);
+    String toString();
+    int hashCode();
+}