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lab/lab2/Question3/TestPalindrome.java

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+/*
+ * Author: CHEN Yongyuan (Walter) 1930006025 from OOP(1007)
+ * Date: 2022-03-02
+ * Description: Test whether a sentence is a palindrome, iguore the case punctuation and spaces.
+ * Assignment: #2 Question 3
+ */
+
+import java.util.Scanner;
+
+public class TestPalindrome {
+    public static void main(String[] args) {
+        System.out.print("Enter a String: ");
+        Scanner in = new Scanner(System.in);
+
+        // read a line of input from the user
+        String inStr = in.nextLine();
+
+        // close the scanner object
+        in.close();
+
+        // convert the string to lower case
+        String str = inStr.toLowerCase();
+
+        // remove all the punctuation using Character.isLetter()
+        // str = str.replaceAll("[^a-zA-Z0-9]", "");
+        String str2 = str;
+        str = "";
+        for (int i = 0; i < str2.length(); i++) {
+            if (Character.isLetter(str2.charAt(i))) {
+                str += str2.charAt(i);
+            }
+        }
+
+        // reverse the string
+        String reverse = new StringBuffer(str).reverse().toString();
+
+        // compare the two strings
+        // if they are the same, the string is a palindrome
+        // otherwise, it is not
+        System.out.format("\"%s\" is %s a palindrome.\n", inStr,
+                str.equals(reverse) ? "" : "not ");
+    }
+}