如何基于Java实现对象List排序

这篇文章主要介绍了如何基于java实现对象list排序,文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下

按照对象中的某个属性，对对象list进行排序。

以初唐四杰的成绩排名为例，对诗人进行排序。

java实现如下：

1、诗人（poet）类结构，定义如下：

/**
 * created by miracle luna on 2020/1/11
 */
public class poet {
  private string name;
  private double score;

  public poet(string name, double score) {
    this.name = name;
    this.score = score;
  }

  public string getname() {
    return name;
  }

  public void setname(string name) {
    this.name = name;
  }

  public double getscore() {
    return score;
  }

  public void setscore(double score) {
    this.score = score;
  }

  @override
  public string tostring() {
    return "poet{" +
        "name='" + name + '\'' +
        ", score=" + score +
        '}';
  }
}

2、诗人按照成绩排名，代码如下：

import java.util.arraylist;
import java.util.comparator;
import java.util.list;

/**
 * created by miracle luna on 2020/1/11
 */
public class poetsort {

  public static void main(string[] args) {
    list<poet> poetlist = new arraylist<poet>();
    poet poet1 = new poet("杨炯", 94.0);
    poetlist.add(poet1);
    poet poet2 = new poet("卢照邻", 92.5);
    poetlist.add(poet2);
    poet poet3 = new poet("骆宾王", 95.0);
    poetlist.add(poet3);
    poet poet4 = new poet("王勃", 99.5);
    poetlist.add(poet4);


    // 初始顺序
    system.out.println("==> 初始顺序如下：");
    poetlist.foreach(poet -> system.out.println(poet.tostring()));

    // 按照分数排名(从高到低)
    poetlist.sort(new comparator<poet>() {
      @override
      public int compare(poet poet1, poet poet2) {
        double score1 = poet1.getscore();
        double score2 = poet2.getscore();
        return score2.compareto(score1);
      }
    });
    system.out.println("\n==> 按照分数排名(从高到低)如下：");
    poetlist.foreach(poet -> system.out.println(poet.tostring()));

    // 按照分数排名(从低到高)
    poetlist.sort(new comparator<poet>() {
      @override
      public int compare(poet poet1, poet poet2) {
        double score1 = poet1.getscore();
        double score2 = poet2.getscore();
        return score1.compareto(score2);
      }
    });
    system.out.println("\n==> 按照分数排名(从低到高)如下：");
    poetlist.foreach(poet -> system.out.println(poet.tostring()));
  }
}

3、运行结果如下：

==> 初始顺序如下：
poet{name='杨炯', score=94.0}
poet{name='卢照邻', score=92.5}
poet{name='骆宾王', score=95.0}
poet{name='王勃', score=99.5}

==> 按照分数排名(从高到低)如下：
poet{name='王勃', score=99.5}
poet{name='骆宾王', score=95.0}
poet{name='杨炯', score=94.0}
poet{name='卢照邻', score=92.5}

==> 按照分数排名(从低到高)如下：
poet{name='卢照邻', score=92.5}
poet{name='杨炯', score=94.0}
poet{name='骆宾王', score=95.0}
poet{name='王勃', score=99.5}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。