在 3 个 int 字段上对对象的 ArrayList 进行排序

Question

我下面的代码无法根据第一次收入、年龄和 postCode 对 ArrayList 进行排序。 我在网上阅读了许多示例，但未能提出可行的解决方案。请帮忙。

如果一个 4 人列表有 int 数据，它被简化为一个数字，如下所示。

• 1,2,3

• 0,0,0

• 1,3,4

• 1,3,2

  那么它应该将它们排序为

• 0,0,0

• 1,2,3

• 1,3,2

• 1,3,4

谢谢

public class Person implements Comparable<Person> {
private int income;
private int age;
private int postCode;

public Person(){}
public Person(int income, int age, int postCode) {
    this.income = income;
    this.age = age;
    this.postCode = postCode;
}

@Override
public int hashCode() {
    int result = income;
    result = 31 * result + age;
    result = 31 * result + postCode;
    return result;
}

@Override
public int compareTo(Person another) {
    return ((Integer) income).compareTo(another.getArea());
}

}

Collections.sort(myList)

Answer 1

public int compareTo( Person another )
{
    if ( this.income == another.income )
    {
        if ( this.age == another.age )
        {
            return ((Integer) this.postCode).compareTo(another.postCode );
        }

        return ((Integer) this.age).compareTo(another.age );

    }

    return ((Integer) this.income).compareTo(another.income );
}