update java 125, progress

data/progress.txt

@@ -1,3 +1,4 @@
+20240510: 125
 20240314: 647
 20240313: 338,347,371,417(again),424(again),435,572(again)
 20240312: 297(again),300,322(again),323

data/to_review.txt

@@ -1,3 +1,12 @@
+2024-07-04 -> ['125']
+2024-06-13 -> ['125']
+2024-05-31 -> ['125']
+2024-05-23 -> ['125']
+2024-05-18 -> ['125']
+2024-05-15 -> ['125']
+2024-05-13 -> ['125']
+2024-05-12 -> ['125']
+2024-05-11 -> ['125']
 2024-05-07 -> ['338,347,371,417(again),424(again),435,572(again)']
 2024-05-06 -> ['297(again),300,322(again),323']
 2024-05-05 -> ['261(again!!!),268,269(again),271,295(again)']

leetcode_java/src/main/java/LeetCodeJava/String/ValidPalindrome.java

@@ -24,6 +24,29 @@ public boolean isPalindrome(String s) {
             return true;
         }
 
+        StringBuilder sb = new StringBuilder();
+        for (int idx = 0; idx < s.length(); idx++){
+            if (Character.isLetterOrDigit(s.charAt(idx))){
+                sb.append(String.valueOf(s.charAt(idx)).toUpperCase());
+            }
+        }
+
+        // NOTE : should use equals (so compare value but not memory address)
+        /**
+         * The issue in your code is with the comparison of strings using ==.
+         * In Java, you should use the equals method to compare strings for equality.
+         * Here's the corrected code:
+         */
+        return sb.toString().equals(sb.reverse().toString());
+    }
+
+    // V0'
+    public boolean isPalindrome_0(String s) {
+
+        if (s == null || s.length() == 0){
+            return true;
+        }
+
         String sUpper = "";
         for (int idx = 0; idx < s.length(); idx++){
             if (Character.isLetterOrDigit(s.charAt(idx))){

leetcode_java/src/main/java/dev/workspace3.java

@@ -19,6 +19,27 @@ public static void main(String[] args) {
         for (ThreadInfo threadInfo : threadInfos) {
             System.out.println("[" + threadInfo.getThreadId() + "] " + threadInfo.getThreadName());
         }
+    }
+
+    // LC 125
+    public boolean isPalindrome(String s) {
+
+        if (s == null || s.length() == 0){
+            return true;
+        }
+        String s_updated = "";
+        StringBuilder sb = new StringBuilder();
+        //String[] s_split = s.split(",");
+        char[] array = s.toCharArray();
+        for (char x : array){
+            String x_ = Character.toString(x);
+            if (x_ != null && x_ != "" && Character.isAlphabetic(x)){
+                sb.append(x_.toLowerCase());
+            }
+        }
 
+        System.out.println(sb.toString());
+        return sb.toString() == sb.reverse().toString();
     }
+
 }