＝＝＝＝＝编译错误实例＝＝＝＝[子类创造自己的构造函数]＝＝＝＝
class SrInherit1
{
  int x,y;
  SrInherit1(int a,int b)
  {
    x=a;
    y=b;
  }
}
class SrInherit2 extends SrInherit1
{
  SrInherit2(int a,int b)
  {
    x=a+3;
    y=b+7;
  }
}
public class SrInherit
{
  public static void main(String args[])
  {
    int sum;
    SrInherit2 Srv=new SrInherit2(40,80);
    sum=Srv.x+Srv.y;
    System.out.println("sum="+sum);
  }
} 

＝＝＝＝＝编译可通过实例＝＝＝＝＝[子类继承父类构造函数]＝＝＝
class SrInherit1
{
  int x,y;
  SrInherit1(int a,int b)
  {
    x=a;
    y=b;
  }
}
class SrInherit2 extends SrInherit1
{
  SrInherit2(int a,int b)
  {
    super(a,b);
  }
}
public class SrInherit
{
  public static void main(String args[])
  {
    int sum;
    SrInherit2 Srv=new SrInherit2(40,80);
    sum=Srv.x+Srv.y;
    System.out.println("sum="+sum);
  }
}