What this code does?

[Vivek Alampally]

Hi everybody,
Can anyone here tell me what the following code does
SwingUtilities.invokeAndWait(new Runnable() {
public void run() {
JLabel lbl = new JLabel("Hello World");
add(lbl);
}
});
It looks strange. I can't understand the syntax. Could anyone please explain what is this. I know Thread can be created by extending Thread class/implementing runnable.
But strange part here is it is creating an object by newing a Runnable which is an interface.

Thanks,
Vivek.

[Shanky Sohar]

here we are creating a annonymouse inner class which implement the runnable interface.

donot worry you will see such kind of syntax when you reach the innerclass chapter if you are studing for SCJP

[Shanky Sohar]

One more thing please use CODETAGS while posting your queries.

[Seetharaman Venkatasamy]

Vivek, run below code; this example is almost related to your question

    
List<Integer> aList = new ArrayList<Integer>(){
public String toString()
{
     return "JavaRanch";
}
};
aList.add(42);
			
System.out.println(aList);

the annonymous class allow you to override a method for a particular instance.