2021-10-06

#闭包

public interface Increaseable {
    void increase();
}

class Test {

    int i = 0;

    private void work() {
        System.out.println(i++);
    }

    private class Closure implements Increaseable {

        @Override
        public void increase() {
            work();
        }
    }

    public Increaseable getCallBackReference() {
        return new Closure();
    }
}

class Main {
    public static void main(String[] args) {
        Test test = new Test();
        test.getCallBackReference().increase();
        test.getCallBackReference().increase();
        test.getCallBackReference().increase();
    }
}