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class A {
    void test() {
        System.out.println("One");
    }
}
 
interface J {
    void first();
}
 
class B extends A {  // This class object can referenced using A like A a = new B()
 // code    
}
 
class B implements J { // // This class object can referenced using J like J j= new B()
    // code
}
 
// my question is what happens in case of below which referencing for runtime polymorphism ??
class B extends A implements J {
 // code 
} 

Main.java:16: error: duplicate class: B
class B implements J { // // This class object can referenced using J like J j= new B()
^
Main.java:21: error: duplicate class: B
class B extends A implements J {
^
2 errors

Standard output is empty