From 00c56e77c4aaa4bcc36527f3e78880051905c5ea Mon Sep 17 00:00:00 2001
From: arinming <jyandysys1@naver.com>
Date: Wed, 31 Jan 2024 23:19:19 +0900
Subject: [PATCH] =?UTF-8?q?[Week3][Chap10]=20=EB=8B=A4=EC=9A=B4=EC=BA=90?=
 =?UTF-8?q?=EC=8A=A4=ED=8C=85=EA=B3=BC=20=EC=A3=BC=EC=9D=98=EC=A0=90=20(#2?=
 =?UTF-8?q?7)?=
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---
 .../java-basic/src/poly/basic/CastingMain4.java"  | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
 create mode 100644 "\352\271\200\354\225\204\353\246\260/java-basic/src/poly/basic/CastingMain4.java"

diff --git "a/\352\271\200\354\225\204\353\246\260/java-basic/src/poly/basic/CastingMain4.java" "b/\352\271\200\354\225\204\353\246\260/java-basic/src/poly/basic/CastingMain4.java"
new file mode 100644
index 0000000..f56a10f
--- /dev/null
+++ "b/\352\271\200\354\225\204\353\246\260/java-basic/src/poly/basic/CastingMain4.java"
@@ -0,0 +1,15 @@
+package poly.basic;
+
+// 다운 캐스팅을 자동으로 하지 않는 이유
+public class CastingMain4 {
+    public static void main(String[] args) {
+        Parent parent1 = new Child();
+        Child child1 = (Child) parent1;
+        child1.childMethod();   // 문제 없음
+
+        Parent parent2 = new Parent();
+        
+        Child child2 = (Child) parent2; // 런타임 오류 - ClassCastException
+        child2.childMethod();   // 실행 불가
+    }
+}