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Topic: Java code doubts (Read 1411 times) |
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mistaken_id
Junior Member
Posts: 132
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Java code doubts
« on: Jul 26th, 2009, 10:57pm » |
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public FolderWatcher() {
Pref.Bool.WatchFS.evtChanged.add(new Event.Listener<Boolean> () {
public void update(Boolean eventData) {
/*
* FIXME Save preferences and scope registry before we remove the watches;
* on Windows that may cause a crash.
*/
if (! eventData)
try {
Pref.save();
ScopeRegistry.getInstance().save();
} catch (IOException e) {
}
setThreadWatchEnabled(eventData);
}
});
What does this code do ? Could anyone tell me the high level description of this code. I DONT what the exace detaisl of this code
Pref.Bool.WatchFS.evtChanged.add is a method .........the above code calls this method. However, instead of passing arguments to the method, a block of code is defined, Is there any term in Java for tihs case. Could anyone tell me what this is called
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mistaken_id
Junior Member
Posts: 132
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Re: Java code doubts
« Reply #1 on: Jul 26th, 2009, 11:01pm » |
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JNotifyListener fsListener = new JNotifyListener() {
public void fileCreated(int arg0, String arg1, String arg2) {
handleEvent(arg1, arg2);
}
public void fileDeleted(int arg0, String arg1, String arg2) {
handleEvent(arg1, arg2);
}
public void fileModified(int arg0, String arg1, String arg2) {
handleEvent(arg1, arg2);
}
public void fileRenamed(int arg0, String arg1, String arg2, String arg3) {
handleEvent(arg1, arg2);
}
};
And similarly this code.... it is creating an object...how ever a block of code follows it...what does this mean
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Grimbal
wu::riddles Moderator
Uberpuzzler
Gender: 
Posts: 7527
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Re: Java code doubts
« Reply #2 on: Jul 27th, 2009, 4:20am » |
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It is an anonymous inner class. It is a way to define a subclass of a class right where it is used.
In this case, it means you are creating a new instance of a subclass of JNotifyListener, but overriding some of its procedures.
It is equivalent to the following
public void someMethod() {
...
// this class has access to some of someMethod's local variables
class MyListener extends JNotifyListener {
// override these
public void fileCreated(int arg0, String arg1, String arg2) {
handleEvent(arg1, arg2);
}
... (other methods)
}
...
// create and use an instance of the listener
JNotifyListener fsListener = new MyListener();
// for instance
someObject.addListener(fsListener);
}
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meetlesli
Newbie
Posts: 2
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Re: Java code doubts
« Reply #3 on: Jul 19th, 2014, 11:09am » |
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Thanks Grimbal .. it worked for me
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