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/* package whatever; // don't place package name! */
 
interface A<T extends Number, R> {
    R foo(T t);
}
 
interface B<S extends String, U> {
    S foo(U u);
}
 
class C<T extends Number, R, S extends String, U> implements A<T, R>, B<S, U> {
 
}
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) 
	{
		// your code goes here
	}
}

Main.java:11: error: C is not abstract and does not override abstract method foo(T) in A
class C<T extends Number, R, S extends String, U> implements A<T, R>, B<S, U> {
^
  where T,R are type-variables:
    T extends Number declared in class C
    R extends Object declared in class C
1 error

Standard output is empty