core java multiple choice questions Mcqs practice questions

11. What will be the output : String x=’0123456789′; System.out.println(x.substring(5,8));.

A. 567 
B. 5678 
C. 56789 
D. 678 

12. The layout of a container can be altered using which of the following methods:.

A. setLayout(aLayoutManager); 
B. addLayout(aLayoutManager); 
C. layout(aLayoutManager); 
D. setLayoutManager(aLayoutManager); 

13. Which statement is true?.

A. Non-static member classes must have either default or public accessibility 
B. All nested classes can declare static member classes 
C. All nested classes can be declared static 
D. Static member classes can contain non-static methods 

14. How can a client prepare itself for callbacks from RMI server?.

A. Extend java.rmi.server.UnicastRemoteObject 
B. Call UnicastRemoteObject.exportObject() 
C. Either of above will work 
D. Neither of above will work 

15. Which of the following, are valid return types, for listener methods:.

A. boolean 
B. the type of event handled  
C. void 
D. Component 

16. Which of the following is not a keyword?.

A. main 
B. public 
C. static 
D. void 

17. Which of the following is not a Marker Interface?.

A. Serializable 
B. Clonable 
C. Remote 
D. Externlizable 

18. Which of the following is not a valid event class?.

A. MouseEvent 
B. PaintEvent 
C. WindowEvent 
D. MouseMotionEvent 

19. When an applet begins awt call following sequence of method.

A. init(),paint(),destroy 
B. init(),start(),paint(),stop(),destroy 
C. init(),service(),destroy 
D. init(),start(),stop(),destroy 

20. The concept of multiple inheritance is implemented in Java by.

A. extending two or more classes 
B. extending one class and implementing one or more interfaces 
C. implementing two or more interfaces 
D. All the above 

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