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A. 0 B. 1 C. 10 D. 1100 E. 10001 F.
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18. Given the following,
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1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. public class ObjComp { public static void main(String [] args ) { int result = 0; ObjComp oc = new ObjComp(); Object o = oc; if if if if (o == oc) result = 1; (o != oc) result = result + 10; (o.equals(oc) ) result = result + 100; (oc.equals(o) ) result = result + 1000;
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System.out.println("result = " + result); } }
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A. 1 B. 10
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Self Test
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C. 101 D. 1001 E. 1101 19. Which two statements are true about wrapper or String classes (Choose two.) A. If x and y refer to instances of different wrapper classes, then the fragment x.equals(y) will cause a compiler failure. B. If x and y refer to instances of different wrapper classes, then x == y can sometimes be true. C. If x and y are String references and if x.equals(y) is true, then x == y is true. D. If x, y, and z refer to instances of wrapper classes and x.equals(y) is true, and y.equals(z) is true, then z.equals(x) will always be true. E. If x and y are String references and x == y is true, then y.equals(x) will be true.
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6: Java.lang The Math Class, Strings, and Wrappers
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SELF TEST ANSWERS
Strings (Exam Objective 8.2)
1. C. After line 5 executes, both s2 and s3 refer to a String object that contains the value def . When line 6 executes, a new String object is created with the value ghi , to which s2 refers. The reference variable s3 still refers to the (immutable) String object with the value def . A, B, D, E, and F are incorrect based on the logic described above. 2. C. Line 12 creates a new String object with the value XYZ , but this new object is immediately lost because there is no reference to it. Line 13 creates a new String object referenced by y. This new String object has the value xyz because there was no Y in the String object referred to by x. Line 14 creates a new String object, appends abc to the value xyz , and refers y to the result. A, B, D, E, and F are incorrect based on the logic described above. 3. C. Line 13 creates two, one referred to by x and the lost String xyz . Line 14 creates one (for a total of three). Line 15 creates one more (for a total of four), the concatenated String referred to by x with a value of xyzabc . A, B, and D are incorrect based on the logic described above. 4. B. Both substring() and charAt() methods are indexed with a zero-base, and substring() returns a String of length arg2 arg1. A, C, D, E, and F are incorrect based on the logic described above. 5. E. In line 7 the code calls a StringBuffer method, append() on a String object. A, B, C, D, and F are incorrect based on the logic described above.
Math (Exam Objective 8.1)
6. B. Math.round() adds .5 to the argument then performs a floor(). Since the code adds an additional .5 before round() is called, it s as if we are adding 1 then doing a floor(). The values that start out as integer values will in effect be incremented by 1 on the round() side but not on the ceil() side, and the noninteger values will end up equal. A, C, D, and E are incorrect based on the logic described above.
Self Test Answers
7. A, B, and D. The max() method is overloaded to take two arguments of type int, long, float, or double. C is incorrect because the max() method only takes two arguments. 8. B and C. The result range for random() is 0.0 to < 1.0; 1.0 is not in range. A, D, E, and F are incorrect based on the logic above. 9. C. The sqrt() method returns NaN (not a number) when it s argument is less than zero. A, B, D, and E are incorrect based on the logic described above. 10. C. The Math class trigonometry methods expect their arguments to be in radians, not degrees. Line 5 can be decoded: Convert 75 (degrees) into radians, then find the sine of that result. A, B, D, E, and F are incorrect based on the logic described above.
Wrappers (Exam Objective 8.3)
11. B and D. B is incorrect because the valueOf() method returns an Integer object. D is incorrect because the parseInt() method takes a String. A, C, E, and F all represent valid syntax. Line 5 takes the String 345 to be octal number, and converts it to an integer value 229. 12. C. All of this code is legal, and line 5 creates a new String with a value of 42.5 . Lines 6 and 7 convert the String to a double and then back again. Line 8 is fun Math.ceil() s argument expression is evaluated first. We invoke the valueOf() method that returns an anonymous Double object (with a value of 42.5). Then the doubleValue() method is called (invoked on the newly created Double object), and returns a double primitive (there and back again), with a value of (you guessed it) 42.5. The ceil() method converts this to 43.0, which is cast to an int and assigned to x. We know, we know, but stuff like this is on the exam. A, B, D, E, and F are incorrect based on the logic described above. 13. E. The compiler fails at line 10 because b1 is a reference variable to a Boolean wrapper object, not a boolean primitive. Logical boolean tests can t be made on Boolean objects. A, B, C, D, and F are incorrect based on the logic described above. 14. A, B, and D. A won t compile because the floatValue() method is an instance method that takes no arguments. B won t compile because the valueOf() method returns a wrapper object. D won t compile because the parseFloat() method takes a String. C, E, and F are all legal (if not terribly useful) ways to return a primitive float.
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