阿里巴巴技术类笔试真题

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　　Question 49. (单选)

　　Each method in a class must have a unique name.

　　1. FALSE

　　2. TRUE

　　Question 50. (单选)

　　When an instance of a class, or object, is specified as a parameter to a method, a reference to the said object is passed to the method.

　　1. FALSE

　　2. TRUE

　　Question 51. (单选)

　　All interface methods must be declared as public when implemented in a class.

　　1. FALSE

　　2. TRUE

　　Question 52. (单选)

　　Which of the following expressions will produce errors upon compilation?

　　(A) boolean a = (boolean) 1;

　　(B) boolean b = (false && true);

　　(C) float y = 22.3; (D) int x = (25 | 125)

　　1. (A) & (C)

　　2. (A)

　　3. (A), (C) & (D)

　　4. (A), (B) & (D)

　　Question 53. (单选)

　　Which lines of the following will produce an error?

　　1. byte a1 = 2, a2 = 4, a3;

　　2. short s = 16;

　　3. a2 = s;

　　4. a3 = a1 * a2;

　　1. Line 3 and Line 4

　　2. Line 1 only

　　3. Line 3 only

　　4. Line 4 only

　　5. Line 1 and Line 4

　　Question 54. (单选)

　　Which keyword can protect a class in a package from accessibility by the classes outside the package?

　　1. don’t use any keyword at all (make it default)

　　2. private

　　3. protected

　　4. final

　　Question 55. (单选)

　　Which of the following statements are valid array declaration?

　　(A) int number();

　　(B) float average[];

　　(C) double[] marks;

　　(D) counter int[];

　　1. (B) & (C)

　　2. (A)

　　3. (A) & (C)

　　4. (D)

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