请问这个程序错在哪里？？

[beyondada]

public class FatherRevenue{
private double money;
private int year;

FatherRevenue(float m,int y)
{
money=m;
year=y;
}
public double Getmoney(){
return money=money*0.02;
}
public int Getyear(){
return year;
}

public static void main(String args[ ])
{
FatherRevenue f(11.0,1993)=new FatherRevenue ();
SonRevenue s(15.0,1995)=new SonRevenue();
//s.Getyear();
if(s.Getyear()>1995)
System.out.println(f.Getmoney());
else
System.out.println(s.Getmoney());
}
}
class SonRevenue extends FatherRevenue{
private double money;
private int year;
谢谢~~
SonRevenue(double m,int y){
money=m;
year=y;
}

public double Getmoney(){
money=money*0.03;
return money;
}
public int Getyear()
{
return year;
}
}

[plusjava]

FatherRevenue f=new FatherRevenue (15.0,1995);
SonRevenue s=new SonRevenue(15.0,1995);

[virgin_killer]

public class FatherRevenue{
protected double money;
protected int year;

protected FatherRevenue(double m,int y)
{
money=m;
year=y;
}
public double Getmoney(){
return money=money*0.02;
}
public int Getyear(){
return year;
}

public static void main(String args[ ])
{
FatherRevenue f = new FatherRevenue (11.0,1993);
SonRevenue s=new SonRevenue(15.0,1995);
//s.Getyear();
if(s.Getyear()>1995)
System.out.println(f.Getmoney());
else
System.out.println(s.Getmoney());
}
}
class SonRevenue extends FatherRevenue{

int year;
SonRevenue(double a,int b){
super(a,b);
}

public double Getmoney(){
money=money*0.03;
return money;
}
public int Getyear()
{
return year;
}
}
注:超类变量应该protected,另外子类继承超类,变量自动继承.你刚刚的代码中,在子类中重新定义了money和year,这就隐藏了超类被继承的变量

[xiaohaiz]

程序错在派生类SonRevenue的构造方法。
在其构造方法里面没有显示地构造父类，因此出错。//因为父类没有提供无参数的构造方法
在SonRevenue构造方法第一行加上 super((float)m, y);这个。。
另外
FatherRevenue f(11.0,1993)=new FatherRevenue ();
SonRevenue s(15.0,1995)=new SonRevenue();
这两行什么啊。。
改成：
FatherRevenue f =new FatherRevenue(11.0F, 1993);
SonRevenue s=new SonRevenue(15.0, 1995);

[plusjava]

FatherRevenue f=new FatherRevenue (15.0,1995);
SonRevenue s=new SonRevenue(15.0,1995);

SonRevenue(double m,int y){
super(m,y); //这个不能少的
money=m;
year=y;
}