Java โค้ดที่ผมเขียนขึ้นมาถือว่าโอเคไหมครับสำหรับมือใหม่ (กำลังฝึกเขียน java)

public class testAcct {
	private static int chkDigit,totalNumChk;
	public static void main(String[] args){
		chkAccNo("111333445678");
	}
	private static void chkAccNo(String accNo){
		int var1=0,var2=0,var3=0,var4=0,var5=0,var6=0,var7=0,var8=0,var9=0,var10=0,var11=0;
		int[] sum = new int[] {var1,var2,var3,var4,var5,var6,var7,var8,var9,var10,var11};
		int[] arrMultiple = new int[] {12,1,10,3,8,5,6,7,4,9,2};
		
		if(accNo.length()==12){
			System.out.println(accNo + " -- Length OK");
			chkDigit = (int) accNo.charAt(11)-48;
			
			for (int i=0;i<accNo.length()-1;i++){
				sum[i]=((int) accNo.charAt(i)-48)*arrMultiple[i];
				totalNumChk += sum[i];
			}
						
			//check digit
			checkDigit(totalNumChk%11);
		}else{
			System.out.println("Length ERROR");
		}
	}
	private static void checkDigit(int number){
		System.out.println("Total Sum of Multiple : "+totalNumChk);
		System.out.println("Check Digit : "+chkDigit);
		
		if (number==0){
			System.out.println("Status : check digit ok");
		}else{
			if(number>=10){
				System.out.println("Status : invalid check digit");
			}else{
				if(number == chkDigit){
					System.out.println("Status : check digit ok");
				}else{
					System.out.println("Status : invalid check digit");
				}
			}
		}
	}
}

(int) accNo.charAt(i)-48