feat: Implement utility methods for max, min, and string trimming with uppercase conversion

WHAT the code does:
- Defines class MaxMinMethod with three static utility methods:
  - max(int a, int b): returns the larger of two integers.
  - min(int a, int b): returns the smaller of two integers.
  - trimAndUpperCase(String str):
    - If str is not null, trims leading/trailing spaces and converts it to uppercase.
    - If str is null, returns an empty string.
- In main():
  - Demonstrates max() with inputs 4 and 7.
  - Demonstrates min() with inputs 3 and 9.
  - Demonstrates trimAndUpperCase() with input `"  hhhhhhh akakjskd "`.

WHY this matters:
- Shows how to create **static utility methods** for common operations, a common pattern in Java (similar to java.lang.Math or Apache Commons Lang).
- Reinforces conditional logic:
  - If/else for determining maximum/minimum.
  - Null checks for safer string manipulation.
- Demonstrates string processing using built-in methods trim() and toUpperCase().

HOW it works:
1. max(a, b):
   - Compares a and b, returns whichever is larger.
2. min(a, b):
   - Compares a and b, returns whichever is smaller.
3. trimAndUpperCase(str):
   - If str is null → returns "".
   - Else trims whitespace and converts to uppercase.
4. main():
   - Calls each utility method and prints results.

Tips and gotchas:
- Java’s built-in `Math.max(a, b)` and `Math.min(a, b)` already provide these functionalities, but custom methods can be useful for demonstration.
- Always perform null checks on strings before invoking methods like trim() or toUpperCase() to avoid NullPointerException.
- Consider using Apache Commons StringUtils or Java 11’s `isBlank()` for more advanced string handling.
- Utility classes like this are often declared `final` with a private constructor to prevent instantiation.

Use-cases / analogies:
- max/min: comparing scores, prices, or measurements to pick the higher or lower.
- trimAndUpperCase: preparing user input (like names or IDs) for consistent storage and comparison in databases.

Short key: java-utility-methods max min string-trim uppercase null-check.

Signed-off-by: https://github.com/Someshdiwan <[email protected]>

Author: Someshdiwan

Section16StaticFinal/src/MaxMinMethod.java

@@ -1,38 +1,32 @@
-public class MaxMinMethod
-{
-    public static int max(int a, int b)
-    {
-        if (a > b)
-        {
+public class MaxMinMethod {
+    public static int max(int a, int b) {
+        if (a > b) {
             return a;
         } else {
             return b;
         }
     }
 
-    public static int min(int a, int b)
-    {
-        if (a < b)
-        {
+    public static int min(int a, int b) {
+        if (a < b) {
             return a;
         } else {
             return b;
         }
     }
 
-    public static String trimAndUpperCase(String str)
-    {
-        if(str != null){
+    public static String trimAndUpperCase(String str) {
+        if(str != null) {
             return str.trim().toUpperCase();
         }
-        else{
+        else {
             return "";
         }
     }
 
     public static void main(String[] args){
-        System.out.println("Max: " + MaxMinMethod.max(4,7));  // Output: Max: 7
-        System.out.println("Min: " + MaxMinMethod.min(3,9));  // Output: Min: 3
-        System.out.println("Trimmed and Uppercase: " + MaxMinMethod.trimAndUpperCase("  hhhhhhh akakjskd "));  // Output: HHHHHHH AKAKJSKD
+        System.out.println("Max: " + MaxMinMethod.max(4,7));
+        System.out.println("Min: " + MaxMinMethod.min(3,9));
+        System.out.println("Trimmed and Uppercase: " + MaxMinMethod.trimAndUpperCase("  hhhhhhh akakjskd "));
     }
-}
+}