Example of Super Class And Calculate Average of Three Variables

 class Average 
           { 
                int a,b,c; 
                float av; 
                Average() 
                 { 
                    a=10; 
                b=20; 
                c=30; 
             } 
                Average(int x) 
                   { 
                      a=x; 
                      b=40; 
                      c=50; 
                   } 
                      Average(int x, int y) 
                          { 
                              a=x; 
                          b=y; 
                          c=50; 
                          } 
                          Average(int x,int y, int z) 
                                      { 
                                 a=x; 
                                 b=y; 
                                 c=z; 
                              } 
                                 void getAverage() 
                                   { 
                                       av=(float)(a+b+c)/3; 
                                       System.out.println("Average of three variables is "+av); 
                                   } 
          } 
                          class disc extends Average 
                               { 
                                   int d; 
                                  disc() 
                                      { 
                                         super(); 
                                      } 
                                         disc(int x) 
                                            { 
                                               super(x); 
                                            } 
                                               disc(int x, int y) 
                                                    { 
                                                       super(x,y); 
                                                    } 
                                                       disc(int x, int y, int z) 
                                                        { 
                                                           super(x,y,z); 
                                                        } 
                                                           void getdic() 
                                                             { 
                                                                 d=b*b-4*a; 
                                                                 System.out.println("Discriminate of quadratic equation is"+d); 
                                                             } 
                                } 
                                      class Averagesuper 
                                         { 
                                              public static void main(String args[]) 
                                               { 
                                                   Average p=new Average(); 
                                                   Average q=new Average(15); 
                                                   Average r=new Average(15,30); 
                                                   Average s=new Average(15,30,45); 
                                                  disc t=new disc(); 
                                                  disc u=new disc(15); 
                                                  disc v=new disc(15,30); 
                                                  disc w=new disc(15,30,45); 
                                                  p.getAverage(); 
                                                  q.getAverage(); 
                                                   r.getAverage(); 
                                                  s.getAverage(); 
                                                  t.getdic(); 
                                                  u.getdic(); 
                                                  v.getdic(); 
                                                  w.getdic(); 
                                              } 
                                                  }