Create a String to Integer Converter

java/StringToInt.java

@@ -0,0 +1,55 @@
+
+import java.util.Scanner;
+
+public class StringToInt {
+
+    static int stringtointeger(String str) {
+        int i = 0;
+        if (str == null || str.length() < 1) {
+            return 0;
+        }
+
+        str = str.trim();
+
+        char sign = '+';
+        if (str.charAt(0) == '-') {
+            sign = '-';
+//            i++;
+        } else if (str.charAt(0) == '+'){
+//            i++;
+        }
+
+        int result = 0;
+        for( ; i<str.length(); i++){
+            int curr = str.charAt(i) - '0';
+            if(curr>=0 && curr<=9) {
+                if (result == 0){
+                    result = curr;
+                }
+                else if(result != 0){
+                    result = result*10 + curr;
+                }
+                else if (result > Integer.MAX_VALUE){
+                    return Integer.MAX_VALUE;
+                }
+                else if (result < Integer.MIN_VALUE){
+                    return Integer.MIN_VALUE;
+                }
+            }
+            else {
+                break;
+            }
+        }
+        if(sign == '-')
+            return - result;
+        return result;
+    }
+
+        public static void main (String[]args){
+            System.out.println("Enter a String to convert to Int: ");
+            Scanner stringchoice = new Scanner(System.in);
+            String choice = stringchoice.next();
+
+            System.out.println("Converted int: " + stringtointeger(choice));
+        }
+}