From 7f4b0cd01c44d4ba76e20de999f1395e2f404cea Mon Sep 17 00:00:00 2001
From: xuxin <840198532@qq.com>
Date: Tue, 10 Mar 2026 15:57:32 +0800
Subject: [PATCH] =?UTF-8?q?=E8=BF=9B=E9=98=B6day06-=E5=87=BD=E6=95=B0?=
 =?UTF-8?q?=E5=BC=8F=E6=8E=A5=E5=8F=A3=E7=9A=84=E4=BD=BF=E7=94=A8?=
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---
 .../inmind/functional_interface02/Demo04.java | 45 +++++++++++++++++++
 1 file changed, 45 insertions(+)

diff --git a/javaSE-day07/src/com/inmind/functional_interface02/Demo04.java b/javaSE-day07/src/com/inmind/functional_interface02/Demo04.java
index 6ed600c..3bf5e6b 100644
--- a/javaSE-day07/src/com/inmind/functional_interface02/Demo04.java
+++ b/javaSE-day07/src/com/inmind/functional_interface02/Demo04.java
@@ -9,6 +9,51 @@ package com.inmind.functional_interface02;
 扩展:为何在一个接口中某些抽象方法不需要被重写??比如Comparator接口
 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
+------------------------------------------------------------------
+ 函数式接口的使用：
+ 1.作为参数
+ 2.作为返回值
+
  */
 public class Demo04 {
+    public static void main(String[] args) {
+        //匿名内部类的方式来调用getValue()方法
+        /*int value = getValue(new MyInterface() {
+            @Override
+            public int getSum(int a, int b) {
+                return a+b;
+            }
+        }, 10, 20);*/
+//        int value = getValue((int a, int b)->{return a+b;},10,20);
+        int value = getValue((a, b)-> a+b,10,20);
+        System.out.println("运行结果1："+value);
+        //------------------------------------------
+        MyInterface instance = getInstance();
+        int result = instance.getSum(10, 20);
+        System.out.println("运行结果2："+result);
+    }
+    //定义出一个函数式接口作为返回值类型，参数列表定义为无参的静态方法
+    public static MyInterface getInstance(){
+        /*MyInterface myInterface = new MyInterface() {
+            @Override
+            public int getSum(int a, int b) {
+                return a*b;
+            }
+        };*/
+//        MyInterface myInterface =(int a, int b)->{return a*b;};
+//        MyInterface myInterface =( a,  b)-> a*b;
+        return (a,  b)-> a*b;
+    }
+
+
+
+    //定义出一个有整数返回值，参数列表是函数式接口,2个整数的静态方法
+    public static int getValue(MyInterface myInterface, int a, int b) {
+        int sum = myInterface.getSum(a, b);
+        return sum;
+    }
+
+
+
+
 }