chap4-17.txt

来自「清华大学出版社经典教材系列」· 文本 代码 · 共 56 行

// 程序4-17
class date{	// 日期类
    int year, mon,day;		
	
    date(int y, int m, int d){
        year=y;			// 设置变量year    	
        mon=(m>0 && m<13)?m:1;
        day=checkday(d);		// 设置变量day
    }

    int checkday(int d){
        int daydisp[ ]={0,31,28,31,30,31,30,31,31,30,31,30,31};

        if(d>0 && d<=daydisp[mon])
            return d;
        if(mon==2 && d==29 &&(year%400==0 || year%4==0&& year%100!=0))
              return  d;
        return 1;
    }
    
    String tostring( ){        return year+"/"+mon+"/"+day;    }
} 


class employee{	// 雇员类
    long  id;
    date birthday;

    employee(long no, int year, int mon, int day){
        id=no;
        birthday=new date(year,mon,day);	// 设置组合对象
    }
    
    String tostring( ){	    return id+" , "+birthday.tostring( );    }
}

class manager extends employee {    // 经理类
    double  basePay;

    manager(long no, int y, int m, int d){
        super(no,y,m,d);	// 调用父类构造函数
        basePay=1000;
    }	

    String tostring( ){        return basePay+" , "+super.tostring( );    }
}

public   class  compositionAndInherence {
    public static void  main(String [ ] args){
        manager   boss;
        
        boss=new manager(1001,1971,11,5);        
        System.out.println(boss.tostring( )); 
    }
}