final project q5

finalproject/Question5/CLI.java

@@ -0,0 +1,56 @@
+/*
+ * Author: CHEN Yongyuan (Walter) 1930006025 from OOP(1007)
+ * Date: 2022-04-25
+ * Description: This is the CLI class.
+ */
+
+import java.util.InputMismatchException;
+import java.util.Scanner;
+
+public class CLI {
+	private static Scanner input = new Scanner(System.in);
+
+	/**
+	 * Read one line from CLI.
+	 *
+	* @param message Hint printed to screen
+	* @return one line input
+	*/
+	private static String readLine(String message) {
+		System.out.print(message);
+		return input.nextLine();
+	}
+
+	/**
+	* Read one positive integer.
+	*
+	* @param message HINT printed to screen
+	* @return one positive integer
+	*/
+	private static int readPosInt(String message) {
+		while (true) {
+			System.out.print(message);
+			try {
+				int result = input.nextInt();
+				input.nextLine();
+				if (result >= 0) {
+					return result;
+				} else {
+					System.out.println("Positive integers only!");
+				}
+			} catch (InputMismatchException e) {
+				System.out.println("You must type an integer!");
+				input.nextLine();
+			}
+		}
+	}
+
+	public static void main(String[] args) {
+		String str1 = readLine("Type some text: ");
+		System.out.println("Text read is: " + str1);
+		int i = readPosInt("Type an integer: ");
+		System.out.println("Integer read is: " + i);
+		String str2 = readLine("Type some text: ");
+		System.out.println("Text read is: " + str2);
+	}
+}