Thread: java:29:error:<identifier> expected,java:29:error:invalid method declaration; return type required

abstract class A
{
double x,y;
A(double a,double B)
{
x=a;y=b;
}
abstract double m1()
{
}
class B extends A
{
B(double a,double b)
{
super(a,b);
}
double m1()
{
System.out.println("Inside B");
return x*y;
}
}
class C extends A
{
C(double a,double b)
{
super(a,b);
}
double void m1();
{
System.out.println("Inside C");
}
double p=x*y;
{
System.out.println(p);
}
}
class Demo
{
public static void main(String args[])
{
B.obj=new B(5,5);
C.obj=new C(15,15);
System.out.println("B area is"+b.m1());
System.out.println("C area is"+c.m1());
}
}
}

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