java - Implementation of an abstract class -

i have abstract class want inherit from:

public abstract class myfirstclass<k extends comparable<k>, v> implements iterable<mysecondclass<k, v>> {      // abstract methods } 

i'm not sure how write declaration of class extends abstract class. thought like:

public class myfirstclassimpl<k, v> extends myfirstclass<object, object> {     @override     public iterator iterator()     {         // code     }      // implementation of abstract methods myfirstclass } 

but dosen't seem work way , have trouble finding explanation kind of problem.

if sub-class should generic, should have same generic parameter declaration base class :

public class myfirstclassimpl<k extends comparable<k>, v> extends myfirstclass<k,v> {     @override     public iterator<mysecondclass<k, v>> iterator()     {     // code     } } 

otherwise, sub-class shouldn't have generic type parameters @ :

public class myfirstclassimpl extends myfirstclass<someclassthatimplementscomparable, object> {     @override     public iterator<mysecondclass<someclassthatimplementscomparable,object>> iterator()     {         // code     }      // implementation of abstract methods myfirstclass }