Day 2 Stept 5

Exercises/src/Day2/Day2_5.java

@@ -0,0 +1,37 @@
+package Day2;
+
+import java.util.Scanner;
+
+public class Day2_5 {
+
+	public static void main(String[] args) {
+		String[] messages = { "いまなにしてる", "何も入力されていません", "投稿文が長すぎます", "↓↓↓↓↓↓ 投稿されました ↓↓↓↓↓↓" };
+
+		Scanner scan = new Scanner(System.in);
+		String str = "";
+		int maxLength = 140;
+
+		while (true) {
+			System.out.println(messages[0]);
+			str = scan.nextLine().replace(" ", "").replace(" ", "");
+
+			// 三項演算子 error message in shot the statement but this way is error race hight ( so just the study no using)
+			String errorMessage = str.isEmpty() ? messages[1]
+					: str.length() > maxLength ? messages[2] : null;
+			//null is need the end for root when check the statement that is reprecent for nothig any statement;
+
+			if (errorMessage != null) {
+				System.out.println(errorMessage);
+				continue;
+			}
+
+			break;
+		}
+
+		System.out.println();
+		System.out.println(messages[3]);
+		System.out.println(str);
+
+		scan.close();
+	}
+}