About the argument list of the main function string[] AGRs

1. String[] args is specifically used to receive command-line arguments.
   

2. For example: Java ArrayTest07 abc def AAA JVM before invoking the main method of the ArrayTest07 class, the string "ABC def AAA" is separated by a "space" and stored in a string array.

The experiment code is as follows:

Public class maintest{    public static void main (String[]  args)     {        system.out.println (" The number of elements in an array of type string is: " + args.length";//0 does not receive parameters, all are 0;        / /traverse this array         for (int i=0;i<args.length;i++) { System.out.println (Args[i]);} Design such a requirement: To run the software must increase the user name and password, user name:admin  password: 123, if not provided sufficient parameters, the system exits; if the number of parameters is correct, the user name and password is correct, then prompt * * * Login successful, welcome back! "; User name or password error, also give the corresponding prompt. if (args.length != 2) {    system.out.println ("To use this system you must enter this:username  Password ");     return ;} string username=args[0]; String passwd = args[2];if ("admin". Equals (username) && "123". Equals (passwd)) {//This is written in comparison to the following, You can avoid null pointer exception//if (username.equals ("admin") && passwd.equals ("123")      SYSTEM.OUT.PRINTLN ("Login successful, welcome [" +username+ "] come back! ");} ELSE{&NBSP;&NBSP;&NBSP;&NBSP;SYSTEM.OUT.PRINTLN ("Login failed, user name [" +username+ "] does not exist or the password is wrong! ");}     }}

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About the argument list of the main function string[] AGRs