interface Authorizer { public Boolean authorize(String username, String password); } public class DummyAuthorizer implements Authorizer { public Boolean authorize(String username, String password) { return null; } } ãã£ã¡ã¯ãããã¼ãã§ãã ããã¼ã¯ã©ããã£ãå ´åã«ä½¿ãã®ã§ããï¼ å®éã«ä½¿ç¨ããããã©ããã«é¢ä¿ãªããããã°ã©ã ãé²ããæã§ãã ä¾ãã°ï¼ ãã¹ãã§ãããå®éã«ä½¿ããããã¨ã¯ããã¾ããããä½ãããã®å¼æ°ã渡ãå¿ è¦ãããã¾ãã ä¾ãè¦ãã¦ããã ãã¾ããï¼ ã¯ãã public class System { public System(Authorizer author
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