[Week3][Chap10] instanceof (#27)

LegendStudy · Feb 1, 2024 · 247e4da · 247e4da
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diff --git a/김아린/java-basic/src/poly/basic/CastingMain5.java b/김아린/java-basic/src/poly/basic/CastingMain5.java
@@ -0,0 +1,26 @@
+package poly.basic;
+
+public class CastingMain5 {
+    public static void main(String[] args) {
+        Parent parent1 = new Parent();
+        System.out.println("parent1 호출");
+        call(parent1);
+
+        Parent parent2 = new Child();
+        System.out.println("parent2 호출");
+        call(parent2);
+    }
+
+    private static void call(Parent parent) {
+        parent.parentMethod();
+
+        if (parent instanceof Child) {
+            // Child c = new Parent();
+            System.out.println("Child 인스턴스 맞음");
+            Child child = (Child) parent;
+            child.childMethod();
+        } else {
+            System.out.println("Child 인스턴스 아님");
+        }
+    }
+}
diff --git a/김아린/java-basic/src/poly/basic/CastingMain6.java b/김아린/java-basic/src/poly/basic/CastingMain6.java
@@ -0,0 +1,26 @@
+package poly.basic;
+
+public class CastingMain6 {
+    public static void main(String[] args) {
+        Parent parent1 = new Parent();
+        System.out.println("parent1 호출");
+        call(parent1);
+
+        Parent parent2 = new Child();
+        System.out.println("parent2 호출");
+        call(parent2);
+    }
+
+    private static void call(Parent parent) {
+        parent.parentMethod();
+
+        // Child 인스턴스인 경우 childMethod() 실행
+        if (parent instanceof Child child) {
+            // Child c = new Parent();
+            System.out.println("Child 인스턴스 맞음");
+            child.childMethod();
+        } else {
+            System.out.println("Child 인스턴스 아님");
+        }
+    }
+}