core java multiple choice questions Mcqs practice questions

31. How do you change the current layout manager for container?.

A. use setLayout()  
B. once created you cannot change it 
C. You set setLayoutManager() 
D. use updateLayout() 

32. Which is not keybord in java.

A. final 
B. volatile 
C. unsigned 
D. long 

33. Which method can be used to enable/disable a checkbox menu item?.

A. setVal(boolean) 
B. setState(boolean) 
C. setStatus(boolean) 
D. setItem(boolean) 

34. what makes the java platform dependent.

A. thread 
B. AWT 
C. both of above 
D. none of above 

35. Read object method reconstructs object at the time of retriving from the file.

A. bit by bit 
B. Byte by Byte 
C. Whole object at a time 
D. Element by Element 

36. Which of the following command line options generates documentation for all classes and methods?.

A. public 
B. private 
C. verbose 
D. encoding 

37. Which of the following will produce a value of 22 if x = 22.9? .

A. ceil(x) 
B. round(x) 
C. abs(x) 
D. floor(x) 

38. how are remote object parameters transferred between client and server.

A. services must extend the remote interface 
B. the skeelton file must be present for the server 
C. the server must be runing before its service can be used 
D. all of the above are no longer true 

39. Which of the following collection classes from java.util package are thread safe?.

A. Vector 
B. ArrayList 
C. HashMap 
D. HashNode 

40. Tree Map class is used to implement which collection interface. select the one correct answer.

A. Tree 
B. Sorted Set 
C. List 
D. Sorted Map 

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