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32 Cards in this Set
- Front
- Back
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Class |
Template that describes the state and behaviour that objects of its type support. |
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Object |
Instance of a class, with its own state and access to behaviours of the calss |
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State |
Unique set of instance variables as defined in the class. |
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Behaviour |
Methods of the class |
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Inheritance |
Allowing code from one class to be reused in other classes |
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Interface |
Completely abstract super-class that defines which methods a subclass must support, without any implementation |
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Legal Identifiers |
Must start with a: LETTER, CURRENCY CHARACTER, or CONNECTING CHARACTER. Also, not a keyword |
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:> javac |
javac [options] [source files]
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:> java |
[options] class [args] |
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Magic Main Method |
public static void main(String[] args) |
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Types of Modifiers |
Access modifiers Nonaccess modifiers |
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Interface Constants' Modifiers |
public, static, final |
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Public Member Access |
All other classes, regardless of package, can access the member |
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Private Member Access |
No code can be used anywhere except in that class |
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Default Member Access |
Class may be accessed by any class in the package |
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Protected Member Access |
May be accessed in the package by all, and outside the package through inheritance only (as opposed to by reference) |
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Final Method |
Cannot be overidden by a subclass |
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Final Arguments |
Cannot be changed by the method |
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Abstract Methods |
Has been declared but not implemented (nb: Must declare class abstract) |
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strictfp |
May declare class or method Uses IEEE 754 standard on floating point numbers |
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Arguments |
Things you specify between parenthesis when invoking a method |
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Parameters |
Things the method's signature that indicates what the method must receive when it is invoked |
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Primitive Variables |
char, boolean, byte, short, int, long, float, double |
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Reference Variables |
Refers to an object. Can be of the declared type or any of its subtype |
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Instance Variables |
Variables declared and used inside the class Are assigned default values Can be any access level Can be final, transient Cannot be abstract, synchronized, strictfp, native |
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Local Variables |
Stored on the stack Declared in method, dies at the end Are not assigned default values |
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Final Variables |
Primitive - once assigned, always that value Reference - the object may change its state, but the reference remains pointed at the same object |
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Transient Variables |
When serializing object, the JVM ignores this variable Can only be used for instance variable |
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Volatile Variable |
Variable must always reconcile its own private copy of the variable with the master copy Can only be used with instance variables |
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Static Variables and Methods |
Operate independently of any instances of the class |
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Declaring enums |
enum State { EMPTY, HALFFULL, FULL}; |
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Constant Specific Class Body |
A special section of code only for a specific element of the enum |
