Add HW01 exercises

HW01/Palindrome_03.java

@@ -0,0 +1,26 @@
+import java.util.Scanner;
+public class Palindrome {
+    static boolean isPalin(String s){
+        int i = 0;
+        int j = s.length()-1;
+
+        while (i < j) {
+            if (s.charAt(i) != s.charAt(j)){
+                return false;
+            }
+            i++;
+            j--;
+        }
+
+        return true;
+    }
+    public static void main(String[] args){
+
+    Scanner sc = new Scanner(System.in);
+    String str = sc.nextLine();
+
+    boolean isPal = isPalin(str);
+    System.out.println("is "+ str+ " palindrome? "+ isPal);
+
+    }
+}