Java - Get Command Line Parameters

15/07/18 Permalink

I couldn't find a simple way of parsing command line parameters passed to programs without needlessly importing libraries. String[]args is parsed using spaces only, so if you want more advanced parameters were you name the values and have multiple values like java Prog -opt0 blah blah2 -opt1 blah you'll need to parse it yourself.

Here's a simple way of doing more advanced command line parsing in Java:

 public HashMap> getCommandLineOptions(String[]args){
    HashMap> opts = null;
    String opt = null;	
     for(String arg:args){
        }else if(opt!=null){
           ArrayList oopts = opts.get(opt);
       	     oopts=new ArrayList();
     return opts;
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