GetOptDemopublic class GetOptDemo extends Object Demonstrate the modern way of using GetOpt. This allows a subset of
UNIX sort options: sort -n -o outfile infile1 infile2
which means: sort numerically (-n), writing to file "outfile" (-o
outfile), sort from infile1 and infile2. |
| Methods Summary |
|---|
| static void | doFile(java.lang.String fileName)Stub to demonstrate processing one file.
System.out.print(fileName + ' ");
| | static void | doHelp(int returnValue)Stub for providing help on usage
You can write a longer help than this, certainly.
System.err.println("Usage: GetOptDemo [-h][-n][-o outfile] file ...");
System.exit(returnValue);
| | public static void | main(java.lang.String[] args)
GetOpt go = new GetOpt("hno:");
boolean numeric_option = false;
String outFileName = "(standard output)";
char c;
while ((c = go.getopt(args)) != GetOpt.DONE) {
switch(c) {
case 'h":
doHelp(0);
break;
case 'n":
numeric_option = true;
break;
case 'o":
outFileName = go.optarg();
break;
default:
System.err.println("Unknown option character " + c);
doHelp(1);
}
}
System.out.print("Options: ");
System.out.print("Numeric: " + numeric_option + ' ");
System.out.print("Output: " + outFileName + "; ");
System.out.print("Inputs: ");
if (go.getOptInd() == args.length) {
doFile("(standard input)");
} else for (int i = go.getOptInd(); i < args.length; i++) {
doFile(args[i]);
}
System.out.println();
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