What is error in the following class definitions? 
abstract class xy { 
abstract sum(int x, int y) {

A. class header is not define properly

B. constructor is no defined

C. method is not defined properly

D. no error

You can do it yup
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  2. The concept of multiple inheritance is implemented in Java by
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  4. All methods in an abstract class must be declared abstract.
  5. Which of the following will produce a value of 22 if x=22.9:
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  7. A Java monitor must either extend thread class or implement Runnable interface.
  8. The length of a string object 's1' can be obtained using the expression s1.length.
  9. Which of the following control expressions are valid for an if statement?
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  14. Which of the following keywords are used to control access to a class member?
  15. A catch can have comma-separated multiple arguments.
  16. Which of the following classes are available in the java.lang package?
  17. JSP files creates ________________
  18. Which of the following statements are true?
  19. It is perfectly legal to assign a subclass object to a supper class reference.
  20. We can over load methods with differences only in their return type.
  21. It is perfectly legal to refer to any instance variable inside of a static method.
  22. Which are the valid ways to create DataInputStream streams?
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  26. The break statement is required in the default case of a switch selection structure.
  27. putValue(...) method takes _____________________-
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