From c963da2b2ac17e03a437c30dfa76f6ceb3890510 Mon Sep 17 00:00:00 2001
From: xuxin <840198532@qq.com>
Date: Sat, 17 Jan 2026 10:09:08 +0800
Subject: [PATCH] =?UTF-8?q?day05-=E6=95=B0=E7=BB=84=E7=9A=84=E5=86=85?=
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---
 day05/src/com/inmind/array01/Demo02.java | 34 ++++++++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 day05/src/com/inmind/array01/Demo02.java

diff --git a/day05/src/com/inmind/array01/Demo02.java b/day05/src/com/inmind/array01/Demo02.java
new file mode 100644
index 0000000..782eb2d
--- /dev/null
+++ b/day05/src/com/inmind/array01/Demo02.java
@@ -0,0 +1,34 @@
+package com.inmind.array01;
+
+/*
+    二进制：0~1
+    八进制：0~7
+    十进制：0~9
+    十六进制：0~15，  0~9 10（a）、11（b）、12(c)、13(d)、14(e)、15(f)
+
+    注意：所有的基本数据类型，保存的是值，而引用数据类型，保存的是地址值
+ */
+public class Demo02 {
+    public static void main(String[] args) {
+        //定义一个整数数组
+        int[] arr1 = new int[3];
+
+        int a = 3;
+        System.out.println(a);//3 打印了变量a中的值
+
+        //[I@4eec7777
+        /*
+        [I@4eec7777
+        [I:表示当前是一个数组类型，里面存放的数据类型是int
+        4eec7777：表示数组在堆内存中开辟的空间地址，采用十六进制展示地址值
+         */
+        System.out.println(arr1);//[I@4eec7777
+        System.out.println(arr1[0]);//引用数据类型，只要定义就会有默认值！！！！
+        System.out.println("---------------------------");
+        //定义一个double数组
+//        double[] arr2 = new double[]{0.1,0.2,0.3,0.4};
+        double[] arr2 = {0.1,0.2,0.3,0.4};
+        System.out.println(arr2);//[D@3b07d329
+        System.out.println(arr2[1]);//0.2
+    }
+}