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27 Cards in this Set
- Front
- Back
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The name of a class is to start with an upper case letter. Is this must or convention? |
convention |
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The name of constructor (must be the same name as the class name) or (can be any name, just like other methods.) |
must be the same name as the class name |
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What is a constructor's return type? |
A constructor does not have a return type |
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It is legal to have more than one constructor in a given class. |
True |
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In a class, if a field is private, it can be accessed directly from (any class) or (only inside its class). |
only inside its class |
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The general recommendation for access modifiers in a typical class is that instance variables are (public, private) and methods are (public, private). |
private
public |
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In a class, fields can _____ types, _____ types, and _____ types. |
basic data types existing Java types user-defined types (from user-defined classes) |
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Accessors and mutuators are used to access and modify _____ of a class from (inside, outside) the class |
field variables outside |
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_____ methods typically take no parameter. |
Accessor |
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_____ methods typically take one parameter, of the same type as the corresponding field. |
Mutator |
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_____ methods typically return the same type as the corresponding field. |
Accessor |
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_____ methods typically are void methods. |
Mutator |
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When coding method that performs calculations on fields of that class, these fields (must, don't need to) be passed as parameters to the method. |
Don't need to (Because the class methods have direct access to them.) |
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What is the keyword used for declaring a constant? |
final |
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What is the keyword used for declaring a class variable or method? |
static |
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About enum... It's part of the package _____. It can be used for _____, and _____. This object is a ____ object, |
java.lang self-documentation, and improving the readability of your code constant |
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public Color getColor() This is (accessor, mutator, constructor) because _____. |
accessor Because it's public. |
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public void setColor (Color c) This is (accessor, mutator, constructor) because _____. |
mutator Because in addition to public, client will be able to change (client set color) |
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public static double foo1 (String s) What is the return type of method foo1? |
double |
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public String foo2 (char c) What is the return type of method foo2? |
String |
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public static double foo1 (String s) Is method foo1 a class or instance method? Explain. |
Aa class method Because of keyword "static" is used. |
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public String foo2 (char c) Is method foo2 a class or instance method? Explain. |
An instance method
Because of keyword "static" is not used, |
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"Airplane" class... public static double foo1 (String s) Write a line or two of code to call method foo1 from a client class. |
double d = Airplane.foo1( "Boeing" ); (Airplane.foo1が合っていればOK) |
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"Airplane" class... public String foo2 (char c) Write a line or two of code to call method foo2 from a client class. assume we have instantiated an object named a1. |
String s = a1.foo2( 'A' ); |
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Inside method main...
Airplane.foo3 (34.6); Reconstruct the header of method foo3 (which belongs to the class Airplane) |
public static void foo3( double d ); |
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Inside method main... Airplane a = new Airplane(); int n = a.foo4("Hello"); Reconstruct the header of method foo4 (which belongs to the class Airplane) |
public int foo4( String s ); |
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enum Seasons (Winter, Spring, Summer, Fall); System.out.println( Seasons.Spring.ordinal() ); What is the output? |
1 |
