In our previous examples, we were passing closures to the built-in collection methods. In the examples to date, we have deferred to the collection method to do the closure invocations for us. Let's now look at how we can make a call to the closure ourselves. For the sake of this example, we will ignore the fact that the GDK provides versions of the Thread.start method that achieves the same thing:
class CThread extends Thread {
Closure closure
CThread( Closure c ) {
this.closure = c
this.start()
}
public void run() {
if (closure)
closure() // invoke the closure
}
}
CThread up = new CThread(
{
[1..9]* each {
sleep(10 * it)
println it
}
} )
CThread down = new CThread(
{
["three","two", "one", "liftoff"] each {
sleep(100)
println it
}
} )Here we define a subclass of the Java Thread class, which can be constructed with...