Student对象排序示范

要求：根据student对象的成绩排序
作者：黑曼巴小组
1：创建student对象，属性score，接口Comparable**_<Student_>，_重写_compareTo(Student stu)**

public class Student implements Comparable<Student>{
	private String name;
	private int ID;
	private int score;

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public int getID() {
		return ID;
	}

	public void setID(int ID) {
		this.ID = ID;
	}

	public int getScore() {
		return score;
	}

	public void setScore(int score) {
		this.score = score;
	}

	public Student() {
	}

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

	@Override
	public String toString() {
		final StringBuilder sb = new StringBuilder("Student{");
		sb.append("name='").append(name).append('\'');
		sb.append(", ID=").append(ID);
		sb.append(", score=").append(score);
		sb.append('}');
		return sb.toString();
	}

	@Override
	//实现Comparable的compareTo方法
	public int compareTo(Student stu) {
		// TODO Auto-generated method stub
		return this.getScore()-stu.getScore();
	}
}

2：创建测试类，调用Collections.sort方法排序

public class studentTest {
	public static void main(String[] args) {
		List<Student> students = new ArrayList<>();//创建集合
		students.add(new Student("李四",1,88));//添加元素
		students.add(new Student("刘四",2,78));
		students.add(new Student("张三",3,98));
		students.add(new Student("王维",4,96));
		//2:排序
		Collections.sort(students);
		//3:输出打印
		for(Student s:students){
			System.out.println(s);
		}
	}
}

按葫芦画瓢即可。