12. Software reuse and the standard Java API

Question 1

What three (ranges of) values are returned by a compareTo method, and what does each mean?

Answer 1

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Question 2

What tags do we use to specify a method interface?

Answer 2

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Question 3

What is the maximum number of the 12 following methods that we could legally have in the same class?

public Cooks burn(char coal, int oven) { }
private Cooks burn(char grilled, int fire) { }
public static Cooks burn(char mingly, int ime) { }
public static Cooks burn(char treuse, int glass) { }

public static void burn(char treuse, int glass) { }
private static void burn(char mingly, int ime) { }
public void burn(char grilled, int fire) { }
private void burn(char coal, int oven) { }

public double burn(char coal, int gasBbq) { }
public static double burn(char coal, int fixedGasBbq) { }
private double burn(char coal, int secretHotSpot) { }
private static double burn(char jes, int rest) { }

Answer 3

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Question 4

Is String a built-in type or a reference type? Is it a primitive type?

Answer 4

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Question 5

Name six String instance methods (two may have the same name!).

Answer 5

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Question 6

What is the value of each of the following conditions?

1. ‘A’ < ‘B’
2. ‘A’ < ‘a’
3. ‘Z’ < ‘a’
4. ‘0’ < ‘1’
5. ‘0’ < ‘A’
6. ‘0’ < ‘a’

Answer 6

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Question 7

What is the value of the following expression?

"" + (char) ((int) 'J' - 2
    \+ (char) ((int) 'c' + 2
    \+ (char) ((int) 'n' - 2
    \+ (char) ((int) 'j' + 2
    \+ (char) ((int) 'q' - 2

Answer 7

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