Question

求大神告知完整代码！！！！

Answer 1

public class CalRect {
    public static void main(String args[]){
        try{
            //检查参数个数是否正确
            if(args.length != 2){
                throw new LackOfParamsException("参数个数不对,此处要求输入长和宽两个整数参数!");
            }
            //检查参数是否为大于等于0的正整数
            int a=0,b=0;
            for (int i = 0; i < args.length; i++) {
                int temp = Integer.parseInt(args[i]);
                if(temp <= 0){
                    throw new ArithmeticException();
                }
                if(i==0){
                    a = temp;
                }else {
                    b = temp;
                }
            }
            //周长
            int perimeter = 2*(a+b);
            //面积
            int square = a*b;
            //图形
            StringBuffer graph = new StringBuffer();
            for (int i = 0; i < a; i++) {
                for (int j = 0; j < b; j++) {
                    if(i==0 || i==a-1){
                        graph.append("*");
                    }else {
                        if(j==0 || j==b-1){
                            graph.append("*");
                        }else {
                            graph.append(" ");
                        }
                    }
                    //换行
                    if(j==b-1){
                        graph.append("\n");
                    }
                }
            }
            //打印
            print("矩形周长:" + perimeter);
            print("矩形面积:" + square);
            print("矩形形状:\n" + graph.toString());
        }catch (LackOfParamsException e){
            System.err.println(e.getMessage());
        }catch (NumberFormatException e){
            System.err.println("请输入整数,而非其它字母或特殊符号!");
        }catch (ArithmeticException e){
            System.err.println("请输入大于0的正整数!");
        }finally {
            System.out.println("结束!");
        }
    }
    private static void print(Object o){
        System.out.println(o);
    }
}

/**
 * 缺少参数异常
 */
class LackOfParamsException extends Exception{
    public LackOfParamsException(String errMsg){
        super(errMsg);
    }
}