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Copy pathCheckCode.java
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58 lines (47 loc) · 1.24 KB
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package tmt;
/*
* ean-13 条形码校验方法。
*/
public class CheckCode {
public final static int CODE_LENTH = 13;
public static void main(String[] args) {
// TODO Auto-generated method stub
if(CheckCode.check("6954767430386")){
System.out.println("Good Number!");
}else{
System.out.println("Sorry,please put again!");
}
}
public static boolean check(String code){
if(CODE_LENTH != code.length()){
return false;
}
String reCode = reverseString(code);
char[] codes = reCode.toCharArray();
//从第二位开始所有偶数位数字和
int evenTotal = 0;
int i=0;
for(i=1;i<codes.length;){
evenTotal += Integer.valueOf(codes[i])-48;
i+=2;
}
evenTotal = evenTotal*3;
//从第三位开始所有奇数位数字和
int unevrnTotal = 0;
for(i=2;i<codes.length;){
unevrnTotal += (Integer.valueOf(codes[i])-48);
i+=2;
}
int total = evenTotal + unevrnTotal;
//最后一位校验码
int chackNum = (10-total%10)==10?0:10-total%10;
if(chackNum != (Integer.valueOf(codes[0])-48)){
return false;
}
return true;
}
public static String reverseString(String x){
if( x==null || x.length()<2) return x;
return reverseString(x.substring(1,x.length()))+ x.charAt(0);
}
}