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html programming args is what is known as an array. An array stores a series of values. The values can be Strings as in this example, numbers, objects or any other kind of Java data type. args is a special array that holds the command line arguments. args[0] holds the first command line argument.
html programming args[1] holds the second command line argument, args[2] holds the third command line argument and so on.At this point almost everyone reading this is probably saying "Whoa, that can't be right." However why you're saying depends on your background.If you've never programmed before or if you've programmed only in Pascal or Fortran, you're probably wondering why the first element of the array is at position 0, the second at position 1, the third at position 2 instead of the clearly more sensible element 1 being the first element in the array, element 2 being the second and so on. All I can tell you is that this is a holdover from C where this convention almost made sense.
html programming On the other hand if you're used to C you're probably upset because args[0] is the first command line argument instead of the command name. The problem is that in Java it's not always clear what the command name is. For instance in the above example is it java or Hello? On some systems where Java runs there may not even be a command line, the Mac for example.Now you should experiment with this program a little. What happens if instead of typing java Hello Gloria you type java Hello Gloria and Beth? What if you leave out the name entirely, i.
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