如何在java中使用“闭包编译器”？

public class ClosureExample {
    public static void main(String[] args) {
        int num = 10; // 外部变量

        ClosureFunction closure = new ClosureFunction() {
            @Override
            public void execute() {
                System.out.println(num); // 访问外部变量
            }
        };

        doSomething(closure);
    }

    public static void doSomething(ClosureFunction closure) {
        closure.execute();
    }

    interface ClosureFunction {
        void execute();
    }
}