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23 Cards in this Set
- Front
- Back
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Three ways to access a method
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Invoking a method of declared in the same class
Invoking a method using a reference of the class Invoking an inherited method |
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Can a method declared private be inherited or overrated
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No
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What is the difference between protected and default members
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A default member may be accessed only if the class accessing the member belongs to the same package. On the other hand I protect the member can accessed through inheritance by a subclass even if the subclass is in a different package
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Name all non-access memember modifiers
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Final
Abstract methods Synchronized methods Native methods Strictfp methods |
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Declare all primitives and their bits
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Byte 8
Short 16 Int 32 Long 64 Float 32 Long 64 Boolean Char 16 |
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Modifiers on variables and methods
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There are no final objects, only final references |
True |
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What can you mark static? |
1. Methods 2. Variables 3. A nested class within another class but not within another method 4. Initialization methods |
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Identifiers guidelines |
Begin with the letter, underscore or currency character After first character digits Any length |
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Method signature of Main |
Public static void main(String [] args) |
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What access modifiers can be used with classes? |
public or default |
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What does class visibility dictate? |
1. Create an instance of another class 2. Extend another class 3. Access methods and variables of another class |
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Non access Class Modifiers |
final, abstract, strictfp |
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When is a class marked abstract? |
When a method or more are marked abstract |
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Interface method are always _____________ and ___________ |
Public and abstract |
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Can interfaces have instance variables? |
Yes. As long as they are constants (public, static, final) |
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Methods and instance variables are called _________ |
Members |
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Determine __________ visibility before determining __________ visibility |
Class before member |
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Three ways to spot an abstract methods |
1. Ends in semicolon 2. Is marked abstract 3. No code inside |
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What's the signature of the main() method? |
Public static void main(String [] args) |
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What are the two most common reasons to use inheritance? |
1. Code re-use 2. Polymorphism |
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What non access modifiers keep a method from being overriden? |
1. Final 2. Static |
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Name the 6 rules to overriding a method |
1. Argument list must be exact match 2. Return type must be same or a subtype of original 3. Access level can ONLY be LESS restrictive 4. Unchecked exceptions are good, checked exceptions can't be different or broader 5. Can't override final method 6. Can't override static method |
