<body background= ". /picture/bg_body.gif "></body>
<pre>
public class Pmmmlexport {
Private DEBUGPRN logger = new Debugprn (PmMmlExport.class.getName ());
Private Boolean Mmlasyn;
Private Exportutil Exportutil = new Exportutil ();
Private csvprocess csvprocess = null;
Private string[] Counterids = null;
Public Pmmmlexport (Boolean Mmlasyn) {
This.mmlasyn = Mmlasyn;
}
Public csvprocess getcsvprocess () {
return this.csvprocess;
}
Public string[] Getcounterids () {
return counterids;
}
public void Setcounterids (string[] counterids) {
Counterids = Counterids;
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public class Exportutil {
private static DEBUGPRN logger = new Debugprn (ExportUtil.class.getName ());
Public Exportutil () {
Initdir ();
}
public void Initdir () {
String TmpDir = Pathutil.gettmpcmdir ();
if (new File (TmpDir). Exists ()) {
Fileutil.clear (TmpDir);
} else {
Fileutil.mkdirs (TmpDir);
}
}
</pre>
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<p> Scene:</p>
<p> need to "UT" a method in Pmmmlexport, so create objects of this class,
Member variables are defined in this class private exportutil Exportutil = new Exportutil () <br/>
The exportutil is initialized when the object is created, but the system-provided method is called in the Exportutil constructor method, which is "effective" when the system is running <br/>
Therefore, the object that created the Pmmmlexport will fail </p>
<br/>
<br/>
<br/>
<p> Solutions:</p>
<p> Scenario One: Because the member variable (exportutil) is private, by inheriting Pmmmlexport, and then creating the object "avoid" member variables (exportutil) initialization </p>
<p> Error: Private variables are "inherited" (not inherited??). "To subclasses, only subclasses cannot be accessed directly (through methods)
Regardless of the private, public,protected will inherit the quilt class </p>
<p> two: In subclasses, the re-declaration and initialization of member variables (exportutil) is private exportutil Exportutil = null, in this way overrides </P>
<p> Error: <br/>
1) A member variable inherited from a parent class whose access control remains the same. <br/>
2) A subclass defines a member variable with the same name as the parent class, and does not overwrite the member variable of the parent class, but two member variables coexist. </p>
<p> when the object is created, the member variable is "initialized" <br/>
The idea in scenario one is to "mask" the private member variable in the parent class by inheriting it (visible cannot be masked) <br/>
The idea in scenario two is "to override inherited from the parent class by declaring a member variable of the same name" (coexistence of both) </p>
<p><font color= "Red" > Thinking Adjustment:</font>
The above operation is not aware of the problem: When creating an object, the "initialization" of the member variable is in the process,<br/>
Init is unsuccessful, objects cannot be created successfully <br/>
So the idea of a mock is: before the new Class (), you should mock the private member variable </p>
<br/>
<br/>
<br/>
<p> follow this idea for other design:</p>
<p> three: Through the "anonymous class", overriding the construction method, in "Construction method", replace "member variable",
<br/> The key question is whether the construction method is before or after the member variable is initialized </p>
<p> Scenario Four: The process of getting a "member variable" through reflection does not require the creation of a specific object,<br/> but on the basis of the Replace member variable value or create object </p>
UT a private variable for learning
