Java正则表达式校验十三位纯数字字符串
信息论与编码课后作业
import java.util.Scanner;import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class EAAN13 {
public static void main(String[] args) {
isEAN13();
}
private static void isEAN13(){
int cho;
Scanner scanner = new Scanner(System.in);
Scanner scanner1 = new Scanner(System.in);
String demo= "";
while (true){
System.out.println("*****************");
System.out.println("*****1、校验EAN13******");
System.out.println("*****2、退出程序*******");
System.out.println("*****************");
System.out.print("请选择:");
cho = scanner.nextInt();
switch (cho) {
case 1:
System.out.println("请输入你要转换的EAN13:");
demo = scanner1.next();
int end = isNumeric(demo);
if (end == 1){
System.out.println("校验码合格!");
}else{
System.out.println("您的输入不符合EAN13规定的要求请重新选择:");
isEAN13();
}
break;
case 2:
System.exit(0);
break;
default:
System.out.println("输入错误!");
}
}
}
private static int isNumeric(String str)
//正则表达式校验13位数字
{
Pattern pattern = Pattern.compile("\\d{13}");
//System.out.println(pattern.pattern());
Matcher isNum = pattern.matcher(str);
if( !isNum.matches() )
{
return 0;
}else{
return 1;
}
}
}
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