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摘要： class AddException extends Exception{ //声明异常类 String message; public AddException(int m,int n){ message=m+"是负数或"+n+"是负数或"+m+n+"是负数,不符合要求。"; } public S 阅读全文

摘要： public class Main{ public static void main(String args[]){ double all; Board board=new Board(); QingBoard qingBoard=new QingBoard(); board=qingBoard; 阅读全文