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It allows you to provide some defined parameters that the user can input at the command prompt. For example, this might be some user options, or parameters that can be provided to the program rather than using default values. It is a useful way to test inputs in a program without going in and modifying the code each time. If you provide code that actson the parameters provided, it also makes the program more flexible by giving the user some intitial input into how the program will run, and may allow the program to run more efficiently as well because you can bypass certain procedures that are not relevant to the user's needs.
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In java every thing is an object. The arguments in the main method can be given only through the command line. Everything you type at the command line will be treated as a String object by the JRE (java runtime environment).So we give string arguments in the main method.
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