JQuery（Javascript）CSS值和运算符(JQuery (Javascript) CSS Value & Operator)

 为了避免重新发明轮子和错误，您应该考虑使用像Apache Commons CLI这样的库，它将为您正确地解析您的命令。 
 
public static void main(final String[] args) {
    Options options = new Options();
    options.addOption(
        Option.builder("y")
            .required(true)
            .hasArg(true)
            .desc("The year")
            .longOpt("year")
            .build()
    );
    options.addOption(
        Option.builder("m")
            .required(true)
            .desc("The months")
            .numberOfArgs(Option.UNLIMITED_VALUES)
            .longOpt("month")
            .build()
    );
    CommandLineParser parser = new DefaultParser();
    CommandLine cmd;
    try {
        cmd = parser.parse(options, args);
    } catch (ParseException e) {
        System.err.println( "Could not parse the command due to: " + e.getMessage());
        HelpFormatter formatter = new HelpFormatter();
        formatter.printHelp( "java", options );
        return;
    }
    String year = cmd.getOptionValue("y");
    String[] months = cmd.getOptionValues("m");
    // Rest of your code here
}
 
 然后，您可以在--year的情况下使用-y或--year提供参数，并在月份的情况下使用-m或--month 。 如果出现解析错误，也会打印用法。 
 
 
 如果你想手动完成（假设你的年份首先跟着几个月），你的代码将是： 
 
public static void main(final String[] args) {
    if (args.length < 2)
        throw new IllegalStateException("Not enough arguments");
    String year = args[0];
    String[] months = new String[args.length - 1];
    System.arraycopy(args, 1, months, 0, months.length);
    ...
}
 
 但是我们应该添加更多的测试以确保参数的总量是正确的并且参数是有效的，这就是我建议使用库的原因。 

To avoid reinventing the wheel and bugs, you should consider using a library like Apache Commons CLI which will parse your command properly for you.
 
public static void main(final String[] args) {
    Options options = new Options();
    options.addOption(
        Option.builder("y")
            .required(true)
            .hasArg(true)
            .desc("The year")
            .longOpt("year")
            .build()
    );
    options.addOption(
        Option.builder("m")
            .required(true)
            .desc("The months")
            .numberOfArgs(Option.UNLIMITED_VALUES)
            .longOpt("month")
            .build()
    );
    CommandLineParser parser = new DefaultParser();
    CommandLine cmd;
    try {
        cmd = parser.parse(options, args);
    } catch (ParseException e) {
        System.err.println( "Could not parse the command due to: " + e.getMessage());
        HelpFormatter formatter = new HelpFormatter();
        formatter.printHelp( "java", options );
        return;
    }
    String year = cmd.getOptionValue("y");
    String[] months = cmd.getOptionValues("m");
    // Rest of your code here
}
 
You will then be able to provide your arguments using -y or --year in case of the year and using -m or --month in case of the months. The usage will also be printed in case of a parsing error.
 
 
If you want to do it manually (assuming that you have the year first followed by the months), your code will then be:
 
public static void main(final String[] args) {
    if (args.length < 2)
        throw new IllegalStateException("Not enough arguments");
    String year = args[0];
    String[] months = new String[args.length - 1];
    System.arraycopy(args, 1, months, 0, months.length);
    ...
}
 
But we should add more tests to ensure that the total amount of arguments is correct and the arguments are valid which is the reason why I propose to use a library instead.