Identify and correct errors. If there are no error just write correct.

For questions $16,$ consider the following two classes C$,$ D$,$ and interface I

public abstract class C $\{$

private void foo$1()\{$

System.out.println$("$Hello foo$1")$;

$\}$

public abstract void foo$2()$;

public abstract int foo$3()$;

$\}$

public class D extends C $\{$

public void foo$2()\{$

System.out.println$("$Hello foo$2()")$;

$\}$

public int foo$3()\{$

return $10$;

$\}$

private void foo$4()\{$

System.out.println$("$Hello D foo$4()")$;

$\}$

$\}$

$1.$ C c $=$ new C$()$;

$2.$ D d$1=$ new D$()$;

d$1.$foo$1()$;

$3.$ C c$2$;

c$2=$ new D$()$;

$4.$ public interface J extends I $\{\}$

$5.$ public class K $\{$ public void foo$()$;$\}$

$6.$ public class E extends D

$\{$

public void foo$4()$;

$\{$

super.foo$4()$;

System.out.println$("$Hello E foo$4()")$;

$\}$

$\}$