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这是啥意思啊

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何以忘言i

#1 Created at ... [Delete] [Delete and Lock User] 
		if (args.length != 2) {
			System.err.println("Usage:\n  java CopyFile.java <source> <target>");
			System.exit(1);
		}

何以忘言i

#2 Created at ... [Delete] [Delete and Lock User]

自问自答：如果给main传入的参数不是俩，程序发出警告，并关闭

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