格林模拟试题三（上）(7)

 question 22)

which of the following statements are true?

1) all of the variables in an interface are implicitly static
3) all of the methods in an interface are implicitly abstract
 

question 23)

which of the following statements are true?

1) the string class is implemented as a char array, elements are addressed using the stringname convention
3) strings are a primitive type in java and the stringbuffer is used as the matching wrapper type
  question 24)

which of the following statements are true?

1) a method in an interface must not have a body
3) a class may extends at most one other class plus implement many interfaces
 

question 25)

which of the following statements are true?

1) the following statement will produce a result of 1. system.out.println( -1 >>>2);
2) performing an unsigned left shift (