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Floating-point numbers can be divided by 0.0 without error; the result is
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either positive or negative infinity.
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NaN is not equal to anything, not even itself. Using Wrappers (Exam Objective 8.3) The wrapper classes correlate to the primitive types. Wrappers have two main functions: To wrap primitives so that they can be handled like objects To provide utility methods for primitives (usually conversions) Other than Character and Integer, wrapper class names are the primitive s
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name, capitalized.
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Wrapper constructors can take a String or a primitive, except for Character,
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which can only take a char.
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A Boolean object can t be used like a boolean primitive. The three most important method families are xxxValue() Takes no arguments, returns a primitive parseXxx() Takes a String, returns a primitive, is static, throws NFE valueOf() Takes a String, returns a wrapped object, is static,
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throws NFE
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Radix refers to bases (typically) other than 10; binary is radix 2, octal = 8,
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hex = 16.
Two-Minute Drill
Using equals() (Exam Objective 5.2) Use == to compare primitive variables. Use == to determine if two reference variables refer to the same object. == compares bit patterns, either primitive bits or reference bits. Use equals() to determine if two objects are meaningfully equivalent. The String and Wrapper classes override equals() to check for values. The StringBuffer class equals() is not overridden; it uses == under
the covers.
The compiler will not allow == if the classes are not in the same hierarchy. Wrappers won t pass equals() if they are in different classes.
6: Java.lang The Math Class, Strings, and Wrappers
SELF TEST
The following questions will help you measure your understanding of the material presented in this chapter. Read all of the choices carefully, as there may be more than one correct answer. Choose all correct answers for each question.
Using the java.lang.String Class (Exam Objective 8.2)
1. Given the following,
1. 2. 3. 4. 5. 6. 7. 8. 9. public class StringRef { public static void main(String [] args) { String s1 = "abc"; String s2 = "def"; String s3 = s2; s2 = "ghi"; System.out.println(s1 + s2 + s3); } }
what is the result
A. abcdefghi B. abcdefdef C. abcghidef D. abcghighi E. Compilation fails. F.
An exception is thrown at runtime.
2. Given the following,
11. 12. 13. 14. 15. String x = "xyz"; x.toUpperCase(); String y = x.replace('Y', 'y'); y = y + "abc"; System.out.println(y);
what is the result
A. abcXyZ B. abcxyz C. xyzabc
Self Test
D. XyZabc E. Compilation fails. F.
An exception is thrown at runtime.
3. Given the following,
13. 14. 15. String x = new String("xyz"); y = "abc"; x = x + y;
how many String objects have been created
A. 2 B. 3 C. 4 D. 5 4. Given the following,
14. 15. 16. 17. 18. String a = "newspaper"; a = a.substring(5,7); char b = a.charAt(1); a = a + b; System.out.println(a);
what is the result
A. apa B. app C. apea D. apep E. papp F.
papa
5. Given the following,
4. 5. 6. 7. 8. String d = "bookkeeper"; d.substring(1,7); d = "w" + d; d.append("woo"); System.out.println(d);
what is the result
6: Java.lang The Math Class, Strings, and Wrappers
A. wookkeewoo B. wbookkeeper C. wbookkeewoo D. wbookkeeperwoo E. Compilation fails. F.
An exception is thrown at runtime.
Using the java.lang.Math Class (Exam Objective 8.1)
6. Given the following,
1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. public class Example { public static void main(String [] args) { double values[] = {-2.3, -1.0, 0.25, 4}; int cnt = 0; for (int x=0; x < values.length; x++) { if (Math.round(values[x] + .5) == Math.ceil(values[x])) { ++cnt; } } System.out.println("same results " + cnt + " time(s)"); } }
what is the result
A. same results 0 time(s) B. same results 2 time(s) C. same results 4 time(s) D. Compilation fails. E. An exception is thrown at runtime. 7. Which of the following are valid calls to Math.max (Choose all that apply.) (Yeah, yeah, we know that on the real exam you d know how many were correct, but we just want you to work a little harder here.) A. Math.max(1,4) B. Math.max(2.3, 5)
Self Test
C. Math.max(1, 3, 5, 7) D. Math.max(-1.5, -2.8f) 8. What two statements are true about the result obtained from calling Math.random() (Choose two.) A. The result is less than 0.0. B. The result is greater than or equal to 0.0.. C. The result is less than 1.0. D. The result is greater than 1.0. E. The result is greater than or equal to 1.0. F.
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