人类不是抽象的，不重写抽象方法compareTo（人类）。解决方案？

Question

public class Human implements Comparable<Human> {
    private int age;
    private String name;

    public Human(String givenName, int age) {
        this.name = givenName;
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public int getAge() {
        return age;
    }

    public String introduce() {
        return "Hey! I'm " + name + " and I'm " + age + " years old.";
    }

    public int CompareTo(Human h1, Human h2) {
            int hum1 = h1.getAge();
            int hum2 = h2.getAge();
            System.out.println(hum1 - hum2);
    }
}

这里怎么了？请帮忙。

Answer 1

您要更改：

public int CompareTo(Human h1, Human h2)

致：

public int compareTo(Human h_other)

两件事：首先，“C”是小写的。其次，compareto方法将这个与另一个human进行比较，因此它等效于（使用旧代码）：

public int compareTo(Human h_other) {
    return CompareTo(this, other);
}