Reading arguments in Java

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  • Munk
    #1

    Reading arguments in Java

    Hi,

    I have a question.

    Let's say I want to make a simple java program where the first argument
    passed to the java program is doubled and returned. I.e the reult of doing:
    java Double 5 - would return 10.

    This is turning out to be really hard as I have no idea how to "access" this
    argument in java. If someone could help me out that would be really cool.

    Thanks


    Tags: None
    • Paul
      #2
      Re: Reading arguments in Java

      Munk wrote:
      [color=blue]
      > Hi,
      >
      > I have a question.
      >
      > Let's say I want to make a simple java program where the first argument
      > passed to the java program is doubled and returned. I.e the reult of doing:
      > java Double 5 - would return 10.
      >
      > This is turning out to be really hard as I have no idea how to "access" this
      > argument in java. If someone could help me out that would be really cool.
      >
      > Thanks
      >
      >[/color]

      args[0] in the main method.

      To change it to an Integer:

      Integer.valueOf (args[0])


        Comment

        • Jonas Kongslund
          #3
          Re: Reading arguments in Java

          Munk wrote:[color=blue]
          > Let's say I want to make a simple java program where the first argument
          > passed to the java program is doubled and returned. I.e the reult of
          > doing: java Double 5 - would return 10.
          >
          > This is turning out to be really hard as I have no idea how to "access"
          > this argument in java. If someone could help me out that would be really
          > cool.[/color]

          The main method's argument contains the command line parameters to your
          program.

          Example:

          public class Hello
          {
          public static void main(String args[]) {
          if (args.length == 1) {
          System.out.prin tln("Hello " + args[0]);
          } else {
          System.out.prin tln("Hello World!");
          }
          }
          }

          --
          Jonas Kongslund

            Comment

            • Rick
              #4
              Re: Reading arguments in Java


              If you're using applets you can use the getParameter function. For example,
              I start appletX with these paremeters

              <html code>
              <APPLET codebase=../.. code="appletX.c lass" width=543 height=297>
              <PARAM NAME = data VALUE = test >
              </APPLET>

              Now you can get that 'data' parameter by calling getParameter( "data" )
              somewhere. Maybe this works with normal Java programs as well.
              But if I'm right you can't name the argments so I doubt if you can
              use it then. In that case, indeed use the main method of your app, like
              Jonas and Paul showed.

              Greetings,
              Rick


                Comment

                • Paul
                  #5
                  Re: Reading arguments in Java

                  Paul wrote:

                  [color=blue]
                  >
                  > Integer.valueOf (args[0])
                  >
                  >[/color]


                  or Integer.parseIn t(args[0]) returns a primitive

                    Comment

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