"如何从对象的构造函数中的另一个类访问布尔值？"

Question

So I have a main class, and in this class I have a boolean called test. I want to be able to flip it either on or off after a certain amount of time, so I have a class called BooleanFlipCounter. Below

public class BooleanFlipCounter implements Runnable {
    int seconds;
    boolean booleanToFlip;
    boolean setOnOrOff;

    // Seconds is seconds before flip.
    // booleanToFlip is where you define where you use it which boolean to use.
    // setOnOrOff is true or false, whether it flips it to on or off after a
    // certain time.

    public BooleanFlipCounter(int secondss, boolean booleanToFlips, 
                              boolean setOnOrOffs) {
        seconds = secondss;
        booleanToFlip = booleanToFlips;
        setOnOrOff = setOnOrOffs;
    }

    @Override
    public void run() {
        // TODO Auto-generated method stub
        while (seconds <= 0) {

            System.out.println("1: " + booleanToFlip + " : " + setOnOrOff);
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            seconds--;
            System.out.println("Minused");

        }

        if (setOnOrOff == true) {
            Main.test = true;
            System.out.println("2: " + booleanToFlip + " : " + setOnOrOff);
        } else if (setOnOrOff == false) {
            Main.test = false;
            System.out.println("3: " + booleanToFlip + " : " + setOnOrOff);
        }

    }

}

I want to be able to access "test" when I create a new BooleanFlipCounter. How do I access it as the boolean object, and not as an actual boolean? If that makes any sence.

Answer 1

A boolean variable is not an object, and you can't access it "as" an object. If you want a reference to a boolean variable, you need to use a reference to the object that contains it.

You could define an interface:

public interface Testable {
    boolean isTest();
    void setTest(boolean test);
}

Then you can make your Main class implement Testable in terms of its internal test flag, and make BooleanFlipCounter take a reference to a Testable object that it should manipulate.

(Note that this requires you to create an instance of your Main class, or at least of something that implements the Testable interface. If the Main.test flag is currently a static variable, consider making it non-static. You can have your static main method just create a new Main() and call a method on it to do the real work.)

Answer 2

[r}>>sys.pixelchanger.letterenderer.render("hello world");
[r}>>sys.pixelchanger.letterenderer.rener("hello world");