sub.java

effective-java中文英文版,大师人物写的

// page 81

import java.util.*;

final class Sub extends Super {
    private final Date date; // Blank final, set by constructor

    Sub() {
        date = new Date();
    }

    // Overrides Super.m, invoked by the constructor Super()
    public void m() {
        System.out.println(date);
    }

    public static void main(String[] args) {
        Sub s = new Sub();
        s.m();
    }
}