按字段排序对象数组 [英] Sorting array of objects by field

问题描述

我有东西

Person{
    String name;  
    int age;
    float gradeAverage;
    }

是否有一种简便的方法

Person[] ArrayOfPersons

按年龄?

我必须使用Comparable或Comparator吗?我不完全了解他们.

Do I have to use Comparable or Comparator? I don't fully understand them.

推荐答案

您可以在循环中使用吸气剂检查年龄

You can check for age using a getter in your loop

for (int i = 0 ; i < persons.length - 1; i++) {
    Person p = persons[i];
    Person next =  persons[i+1];
    if(p.getAge() > next.getAge()) {
        // Swap
    }
}

但是实现Comparable是便捷的方法

However implementing Comparable is the convenient way

class Person implements Comparable<Person> {
    String name;  
    int age;
    float gradeAverage;

    public int compareTo(Person other) {
        if(this.getAge() > other.getAge())
            return 1;
        else if (this.getAge() == other.getAge())
            return 0 ;
        return -1 ;
    }

    public int getAge() {
        return this.age ;
    }
}

您可以检查 Comparable 文档也

You can check Comparable documentation also

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