From ad8abbd84e018ddbdd4634157a477c347bae4d01 Mon Sep 17 00:00:00 2001
From: Gaddict <ksano6253@gmail.com>
Date: Wed, 27 Jan 2016 14:37:20 +0900
Subject: [PATCH] =?UTF-8?q?Enum=E3=81=AE=E4=BD=BF=E7=94=A8=E4=BE=8B?=
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これだけゴチャゴチャ書けるのはJavaだけっぽい
---
 java/enum/enumMember.java | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)
 create mode 100644 java/enum/enumMember.java

diff --git a/java/enum/enumMember.java b/java/enum/enumMember.java
new file mode 100644
index 0000000..e0343ec
--- /dev/null
+++ b/java/enum/enumMember.java
@@ -0,0 +1,26 @@
+// かっこいいEnumの活用
+
+	public enum FileType {
+        SystemCd("sys", 10),
+        DcfDrCd("dcf", 6);
+        public final String paramName;
+        public final int cdLength;
+        private FileType(final String paramName, final int cdLength) {
+            this.paramName = paramName;
+            this.cdLength = cdLength;
+        }
+        public static Optional<FileType> paramNameOf(final String paramName) {
+            return Stream.of(values()).filter(f -> f.paramName.equals(paramName)).findAny();
+        }
+    }
+
+// enumはこんなに拡張できる（Javaのみらしい）
+// 以下サンプル
+
+// fileTypeで与えられた文字列が定義されてるかどうかを一撃で判定できる
+final String fileType = "hoge";
+if (!FileType.paramNameOf(fileType).isPresent())
+
+// enumの各項目に紐づく値を取れる
+FileType filetype = FileType.SystemCd;
+fileType.cdLength;