A.left and right must be private.

B.left, right, setLeft, and setRight must be private.

C.setLeft and setRight must be protected.

D.isValid must be public.

A.s.replace(s.indexOf("B"), s.indexOf("B"), "Q");

B.s.replace(s.indexOf("B"), s.indexOf("C"), "Q");

C.s.replace(s.indexOf("A"), s.indexOf("C"), "Q");

D.s.replace(s.indexOf("A"), s.indexOf("B"), "Q");

A.http://localhost mysql.jdbc:3306/database

B.jdbc:mysql://localhost:3306/database

C.jdbe.mysql.com://localhost:3306/database

D.http://localhost.mysql.com:3306/database

A.If (items.stream () .filter (i -> count < 0) . findAny () ) {

B.If (items.stream () .allmatch (i -> count < 0) < 0) ) {

C.If (items.stream () .filter (i -> count < 0) . findFirst () ) {

D.If (items.stream () .anymatch (i -> count < 0) < 0) ) {

A.0

B.The program prints nothing.

C.01

D.It prints 1 in the infinite loop.

E.1