Add String ATOI in Java

I made an implementation that accepts a String and returns an Integer

Java/String_atoi.java

@@ -0,0 +1,80 @@
+import java.util.*;
+
+class String_atoi {
+    // Method to convert a string to an integer
+    public int myAtoi(String s) {
+        int i = 0;              
+        int A = 1;             
+        int count = 0;          
+        long sum = 0;           
+        int count1 = 0;         
+        int N = s.length();     
+
+        // Skip leading whitespaces
+        while (i < N && s.charAt(i) == ' ') {
+            i++;
+        }
+
+        // Start processing each character in the string from the first non-space
+        for (int k = i; k < N; k++) {
+            char C = s.charAt(k);  
+
+            // Handle the initial sign and digit checks
+            if (count == 0 && count1 == 0) {
+                if (C == '-') {
+                    A = -1;       
+                    count1++;     
+                } else if (C == '+') {
+                    A = 1;     
+                    count1++;  
+                } else if (C < '0' || C > '9') {
+                    return 0;     // Return 0 if the first non-space character is not a digit or sign
+                } else if (C >= '0' && C <= '9') {
+                    sum = sum * 10 + (int)(C - '0');  
+                    count++;    
+                }
+            }
+            // If a digit has already been processed
+            else if (count > 0) {
+                if (C == '-' || C == '+') {
+                    break;        // Stop if another sign is encountered after initial digits
+                } else if (C < '0' || C > '9') {
+                    break;        // Stop if a non-digit character is encountered after digits
+                } else if (C >= '0' && C <= '9') {
+                    sum = sum * 10 + (int)(C - '0');  // Continue building the integer
+                    count++;
+                }
+            }
+            // If a sign has already been processed without a digit
+            else if (count1 > 0) {
+                if (C == '-' || C == '+') {
+                    return 0;     
+                } else if (C < '0' || C > '9') {
+                    return 0;     
+                } else if (C >= '0' && C <= '9') {
+                    sum = sum * 10 + (int)(C - '0');  // Start calculating sum with first digit
+                    count++;
+                }
+            }
+
+            // Check for integer overflow and handle it
+            if (sum * A > Integer.MAX_VALUE) {
+                return Integer.MAX_VALUE;  
+            } else if (sum * A < Integer.MIN_VALUE) {
+                return Integer.MIN_VALUE;  
+            }
+        }
+
+        return (int) sum * A;  // Return final converted integer after processing all valid characters
+    }
+
+    // Main method to run and test the myAtoi function
+    public static void main(String[] args) {
+        String_atoi converter = new String_atoi();  
+        Scanner sc = new Scanner(System.in);
+        String str = sc.next();
+        int result = converter.myAtoi(str);        
+        System.out.println("The converted integer is: " + result);  
+        sc.close();
+    }
+}