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矇矇的秘密基地 - 不要從程式語言學習「物件導向」！

Tags: oop on 2008-03-10 -All Annotations (0) -About

more fromwww.kenming.idv.tw

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Using Objects (The Java™ Tutorials > Learning the Java Language > Classes and Objects)

Tags: java, oop on 2007-12-18 -All Annotations (8) -About

more fromjava.sun.com

Code that is outside the object's class must use an object reference or expression,
followed by the dot (.) operator, followed by a simple field name
objectReference.fieldName
```
int height = new Rectangle().height;
```
This statement creates a new Rectangle object and immediately gets
its height. In essence, the statement calculates the default height of a
Rectangle. Note that after this statement has been executed,
the program no longer has a reference to the created Rectangle,
because the program never stored the reference anywhere.
The object is unreferenced, and its resources are free to be recycled by
the Java Virtual Machine.
The Java runtime environment deletes objects when it
determines that they are no longer being used. This process is called garbage collection.
An object is eligible for garbage collection when there are no more references
to that object.
you can explicitly drop an
object reference by setting the variable to the special value null.

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Objects (The Java™ Tutorials > Learning the Java Language > Classes and Objects)

Tags: java, oop on 2007-12-18 -All Annotations (1) -About

more fromjava.sun.com

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Passing Information to a Method or a Constructor (The Java™ Tutorials > Learning the Java Language > Classes and Objects)

Tags: java, oop on 2007-12-18 and saved by4 people -All Annotations (22) -About

more fromjava.sun.com

The Java programming language doesn't let you pass methods
into methods. But you can pass an object into a method and
then invoke the object's methods.
You can use a construct called varargs to pass an arbitrary number of values to a method.
To use varargs, you follow the type of the last parameter by an ellipsis (three dots, ...),
then a space, and the parameter name.
Point... corners
Primitive arguments, such as an int or a
double, are passed into methods by value.
This means that any changes to the values of the parameters exist only within
the scope of the method.
Reference data type parameters, such as objects,
are also passed into methods by value.
the values of the object's fields can be changed in the
method, if they have the proper access level.

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Defining Methods (The Java™ Tutorials > Learning the Java Language > Classes and Objects)

Tags: java, oop on 2007-12-18 and saved by3 people -All Annotations (8) -About

more fromjava.sun.com

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Declaring Member Variables (The Java™ Tutorials > Learning the Java Language > Classes and Objects)

Tags: java, oop on 2007-12-18 and saved by2 people -All Annotations (5) -About

more fromjava.sun.com

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Declaring Classes (The Java™ Tutorials > Learning the Java Language > Classes and Objects)

Tags: java, oop on 2007-12-18 and saved by3 people -All Annotations (10) -About

more fromjava.sun.com

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What Is an Interface? (The Java™ Tutorials > Learning the Java Language > Object-Oriented Programming Concepts)

Tags: java, oop on 2007-12-17 and saved by4 people -All Annotations (1) -About

more fromjava.sun.com

What Is Inheritance? (The Java™ Tutorials > Learning the Java Language > Object-Oriented Programming Concepts)

Tags: java, oop on 2007-12-17 and saved by5 people -All Annotations (2) -About

more fromjava.sun.com

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What Is a Class? (The Java™ Tutorials > Learning the Java Language > Object-Oriented Programming Concepts)

Tags: java, oop on 2007-12-17 and saved by3 people -All Annotations (3) -About

more fromjava.sun.com

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What Is an Object? (The Java™ Tutorials > Learning the Java Language > Object-Oriented Programming Concepts)

Tags: java, oop on 2007-12-17 and saved by8 people -All Annotations (16) -About

more fromjava.sun.com

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