lonecloud :
I have the following code:
public class RefDemo {
static class Demo implements Runnable {
public Demo() {
System.out.println(this.toString() + "-----");
}
@Override
public void run() {
System.out.println("run");
}
}
public static void main(String[] args) {
Runnable runnable = Demo::new; // lambda ref constructor method
runnable.run(); // does not do anything
System.out.println(runnable);
Runnable demo = new Demo(); // using new to create a Demo instance
demo.run();
System.out.println(demo);
}
}
Which prints:
RefDemo$Demo@7291c18f----- // lambda run constructor method print
RefDemo$$Lambda$1/793589513@34a245ab // main method print
RefDemo$Demo@7cc355be-----
run
RefDemo$Demo@7cc355be
I don't know why the code does not print run when calling runnable.run();
Why does that happen?
TomVW :
This code
Runnable runnable = Demo::new;
Is equivalent to this code
Runnable runnable = new Runnable() {
@Override
public void run() {
new Demo();
}
};
So you are not referring to the run method of Demo but to the constructor.
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