Convert String To Number Without Integer.parseInt In Java

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public class JavaStringToNumber {

	public static int convert_String_To_Number(String numStr) {

		char ch[] = numStr.toCharArray();
		int sum = 0;

		int zeroAscii = (int) '0';
		for (char c : ch) {
			int tmpAscii = (int) c;
			sum = (sum * 10) + (tmpAscii - zeroAscii);
		}
		return sum;
	}

	public static void main(String a[]) {

		System.out.println(convert_String_To_Number("2345"));
		System.out.println(convert_String_To_Number("27872"));
	}
}
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