Java实现对象按照其属性排序的两种方法示例

/**
*  学生类
*/
class Student implements Comparable<Student>{

  String name;
  int age;
  int score;

  public Student(String name, int age,int score) {
    this.name = name;
    this.age = age;
    this.score = score;
  }

  @Override
  public int compareTo(Studento) {
    // TODO Auto-generated method stub
    return this.age - o.age;
  }
}

public class Test {

  public static void main(String[] args) {
    // TODO Auto-generated method stub
    ArrayList<Student> students = new ArrayList<>();
    students.add(new Student("大铭", 19, 89));
    students.add(new Student("来福", 26, 90));
    students.add(new Student("仓颉", 23, 70));
    students.add(new Student("王磊", 18, 80));

    System.out.println("排序前:");
    for (Student student : students) {
      System.out.println("姓名："+student.name+" 年龄："+student.age+" 成绩："+student.score);
    }

    // 排序
    Collections.sort(students);

    System.out.println("排序后:");
    for (Student student : students) {
      System.out.println("姓名："+student.name+" 年龄："+student.age+" 成绩："+student.score);
    }
  }
}

/**
*  学生类
*/
class Student {

  String name;
  int age;
  int score;

  public Student(String name, int age,int score) {
    this.name = name;
    this.age = age;
    this.score = score;
  }
}

public class Test {

  public static void main(String[] args) {
    // TODO Auto-generated method stub
    ArrayList<Student> students = new ArrayList<>();
    students.add(new Student("大铭", 19, 89));
    students.add(new Student("来福", 26, 90));
    students.add(new Student("仓颉", 23, 70));
    students.add(new Student("王磊", 18, 80));

    System.out.println("排序前:");
    for (Student student : students) {
      System.out.println("姓名："+student.name+" 年龄："+student.age+" 成绩："+student.score);
    }

    Collections.sort(students,new Comparator<Student>() {

      @Override
      public int compare(Student o1, Student o2) {
        // TODO Auto-generated method stub
        return o1.age-o2.age;
      }
    });

    System.out.println("排序后:");
    for (Student student : students) {
      System.out.println("姓名："+student.name+" 年龄："+student.age+" 成绩："+student.score);
    }
  }
}