From 4ffd1fa1f9c8680fe4f98320653226ecd8216664 Mon Sep 17 00:00:00 2001
From: haerong22 <haerong22@naver.com>
Date: Sat, 6 Mar 2021 22:19:29 +0900
Subject: [PATCH] =?UTF-8?q?java=20oop=20:=20=EB=B3=80=EC=88=98=EC=99=80=20?=
 =?UTF-8?q?=EB=A9=94=EC=86=8C=EB=93=9C=EC=9D=98=20=EA=B4=80=EA=B3=84?=
MIME-Version: 1.0
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---
 JavaOOP/src/Java06.java | 33 +++++++++++++++++++++++++++++++++
 JavaOOP/src/Java07.java | 29 +++++++++++++++++++++++++++++
 2 files changed, 62 insertions(+)
 create mode 100644 JavaOOP/src/Java06.java
 create mode 100644 JavaOOP/src/Java07.java

diff --git a/JavaOOP/src/Java06.java b/JavaOOP/src/Java06.java
new file mode 100644
index 00000000..acc426cb
--- /dev/null
+++ b/JavaOOP/src/Java06.java
@@ -0,0 +1,33 @@
+public class Java06 {
+    public static void main(String[] args) {
+        // 메소드 -> 동작(method), 기능(function)
+        int a = 67;
+        int b = 98;
+
+        int result = sum(a, b);
+        System.out.println(result);
+
+        int[] arr = makeArr();
+        int hap = 0;
+        for (int i = 0; i < arr.length; i++) {
+            hap += arr[i];
+        }
+        System.out.println(hap);
+    }
+
+    // 정수 2개를 매개변수로 받아서 합을 리턴하는 메소드를 정의하시오.
+    // static 메소드에서는 static 메소드만 호출 가능
+    public static int sum(int a, int b) {
+        return a + b;
+    }
+
+    // 값은 하나만 리턴이 가능하다.
+    // 여러 값을 리턴 받고 싶다면? -> 배열
+    public static int[] makeArr() {
+        int[] arr = new int[3];
+        arr[0] = 10;
+        arr[1] = 20;
+        arr[2] = 30;
+        return arr;
+    }
+}
diff --git a/JavaOOP/src/Java07.java b/JavaOOP/src/Java07.java
new file mode 100644
index 00000000..698704e2
--- /dev/null
+++ b/JavaOOP/src/Java07.java
@@ -0,0 +1,29 @@
+public class Java07 {
+    public static void main(String[] args) {
+
+        int a = 20;
+        float b = 56.7f;
+
+        // call by value
+        float v = sum(a, b);
+        System.out.println(v);
+
+        int[] arr = {1, 2, 3, 4, 5};
+
+        // call by reference
+        int vv = arrSum(arr);
+        System.out.println(vv);
+    }
+
+    public static float sum(int a, float b) {
+        return a + b;
+    }
+
+    public static int arrSum(int[] arr) {
+        int sum = 0;
+        for (int i : arr) {
+            sum += i;
+        }
+        return sum;
+    }
+}