From baa28b0a0f279a63b4e8d8874161250b6b2e1c6d Mon Sep 17 00:00:00 2001
From: xuxin <840198532@qq.com>
Date: Thu, 25 Dec 2025 10:48:23 +0800
Subject: [PATCH] =?UTF-8?q?day03-=E5=BE=AA=E7=8E=AF=E7=9A=84=E5=B5=8C?=
 =?UTF-8?q?=E5=A5=97=E7=9A=84=E7=BB=83=E4=B9=A0?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 day03/src/com/inmind/Demo_xunhuans.java | 39 ++++++++++++++++++++-----
 1 file changed, 31 insertions(+), 8 deletions(-)

diff --git a/day03/src/com/inmind/Demo_xunhuans.java b/day03/src/com/inmind/Demo_xunhuans.java
index f7a41a2..97534c5 100644
--- a/day03/src/com/inmind/Demo_xunhuans.java
+++ b/day03/src/com/inmind/Demo_xunhuans.java
@@ -1,14 +1,37 @@
 package com.inmind;
-//循环的嵌套
+
+/*
+循环的嵌套:循环里面还有循环
+
+外层循环执行一次，内层循环执行一轮
+*/
 public class Demo_xunhuans {
     public static void main(String[] args) {
+        //for循环的嵌套（实现时钟的效果）//每小时和每分钟都打印比如0点1分 0点2分~23点59分
+        //0~23时  0~59分
+        for (int i = 0; i < 24; i++) {//0~23时
+            //这个循环体中每小时（循环60次）
+            for (int j = 0; j < 60; j++) {//0~59分
+                System.out.println(i+"时"+j+"分");
+            }
+        }
+
+        System.out.println("程序结束");
+    }
+
+    //循环的嵌套入门
+    public static void demo(String[] args) {
         //打印一个5行每行5个*的矩形
-        System.out.print("*");
-        System.out.print("*");
-        System.out.print("*");
-        System.out.print("*");
-        System.out.println("*");
-        System.out.println("*");
-        System.out.println("*");
+        for (int i = 0; i < 20; i++) {
+            /*System.out.print("*");
+            System.out.print("*");
+            System.out.print("*");
+            System.out.print("*");
+            System.out.print("*");*/
+            for (int j = 0; j < 20; j++) {
+                System.out.print("*");
+            }
+            System.out.println();
+        }
     }
 }