CSE 115: Exam 3
24 Cards in this Set
| Front | Back |
|---|---|
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class header
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public class ToolProxy implements ITool
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instance variable declaration
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private ITool _currentTool;
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method call
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this._currentTool.apply.(point)
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Java reserved word
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public
class
private
this
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argument list
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within a method
(point)
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parameter declaration
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in the header
(ITool tool)
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mutator method
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public void setTool (ITool tool) {
this._currentTool = tool;
}
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implementation clause
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implements ITool
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Suppose Colorable is an interface, that the classes House, canvas and mood are all classes that implement the interface..... is this legal java?
Colorable v1 = new Colorable ();
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no an interface cannot instantiate an interface
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Suppose Colorable is an interface, that the classes House, canvas and mood are all classes that implement the interface..... is this legal java?
Colorable v2 = new Canvas();
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legal
and interface can instantiate a class
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Suppose Colorable is an interface, that the classes House, canvas and mood are all classes that implement the interface..... is this legal java?
Colorable v3 = "Fred";
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No
string is not a type Colorable there for Colorable cannot instantiate "Fred"
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Suppose Colorable is an interface, that the classes House, canvas and mood are all classes that implement the interface..... is this legal java?
Colorable v4 = new House();
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yes
and interface can implement type house
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yes
and interface can implement type house
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yes
and interface can implement type mood
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- - - >
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realization
implementation is a relationship between a class and interface
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---> (solid line)
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relationship
between 2 classes or 2 interfaces
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what does a type hierarchy allows us to......
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separate the (declared) type of variable from (actual) type of an object whose reference we stare in the variable
|
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the difference between type hierarchy vs. class hierarchy
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type hierarchy can be of class or interface and
class hierarchy is only of class type - unique by root: Object
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declared types of the variables determine what?
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the set of methods we can call
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---> (solid line)
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Inheritance
generalization
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how many number of interfaces can a class implement
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as many as we want
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how many interfaces can an interface extend ?
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as many as we want
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a user-defined class extends how many classes
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only ONE
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what does the line look like
public class C1 implements I1
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----> dotted line
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what does the line look like
public class C3 extends C2
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---> solid line
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CSE 115: TEST 1