java单链表实现小学生管理系统

题目：用单链表实现小学生信息（姓名、学号、成绩等）的增删改查与排序

最开始写的时候不知道java中有linklist类，所以用嵌套的方法做的

//Student.java

import java.util.*;
public class Student {
	private int score;
	private double ID;
	private String name;
	private Student next;
	
	public Student(String n,int s,double i,Student stu) {
		name = n;
		score = s;
		ID = i;
		next = stu;
	}
	public static void changeStudent(Student stu,String n,int s,double i) {
		stu.name = n;
		stu.score = s;
		stu.ID = i;
	}
	public void output() {
		System.out.println("Student name:"+name);
		System.out.println("Student ID:"+ID);
		System.out.println("Student score:"+score);
		System.out.print("\n");
	}
	public int getScore() {
		return score;
	}
	public double getID() {
		return ID;
	}
	public String getName() {
		return name;
	}
	public static void addStudent(Student stu,Student head) {
		Student temp = head;
		while(temp.next != null) {
			temp = temp.next;
		}
		temp.next = stu;
	}
	public static void deleteStudent(Student stu,Student head) {
		Student temp = head;
		if(stu.next == null) {
			while(temp.next.next != null) {
				temp = temp.next;
			}
			temp.next = null;
		}
		else if(stu==head) {
			head = stu.next;
			stu.next=null;
		}
		else {
			temp = head;
			while(head.next != stu) {
				temp = temp.next; 
			}
			temp.next = stu.next;
			stu.next = null;
		}
	}
	public static void searchStudent(Student head) {
		Scanner in = new Scanner(System.in);
		System.out.print("please input student ID:");
		double temp = in.nextDouble();
		while(head !=null ) {
			if(head.ID==temp) {
				head.output();
				break;
			}
			head = head.next;
		}
	}
	public static void sortScore(Student head) {
		Student temp1,temp2,temp3;
		temp3=new Student("aaa",33,201622118,null);
		for(temp1=head;temp1.next!=null;temp1 = temp1.next) {
			for(temp2=head;temp2.next!=null;temp2=temp2.next) {
				if(temp2.getScore()>temp2.next.getScore()) {
					temp3.changeStudent(temp3,temp2.next.getName(), temp2.next.getScore(), temp2.next.getID());
					temp2.next.changeStudent(temp2.next, temp2.getName(), temp2.getScore(), temp2.getID());
					temp2.changeStudent(temp2, temp3.getName(), temp3.getScore(), temp3.getID());
				}
			}
		}
	}
	public static void outStudent(Student head) {
		Student temp = head;
		while(temp != null) {
			temp.output();
			temp = temp.next;
		}
	}
}

//StudentTest.java

import java.util.*;
public class StudentTest {
	public static void main(String[] args) {
		Student stu1 =new Student("Bob",99,201622111,null);
		Student stu2 =new Student("Tom",98,201622112,stu1);
		Student stu3 =new Student("Jack",100,201622113,stu2);
		Student head = stu3;
		Student stu4 =new Student("Jony",88,201622114,null);
		while(1==1) {
		Scanner in = new Scanner(System.in);
		System.out.println("Please input your choice:");
		System.out.println("增：1	修改：2	删除：3	查找：4	排序：5  展示：6   退出：0");
		int choice = in.nextInt();
		switch(choice) {
		case 1:
		Student.addStudent(stu4,head);
		Student.outStudent(head);
		break;
		case 3:
		Student.deleteStudent(stu4, head);
		Student.outStudent(head);
		break;
		case 2:
		Student.changeStudent(stu3,"Tom",67,201622115);
		Student.outStudent(head);
		break;
		case 4:
		Student.searchStudent(head);
		break;
		case 5:
		Student.sortScore(head);
		Student.outStudent(head);
		break;
		case 6:
			Student.outStudent(head);
			break;
		case 0:
			System.exit(0);;
		}
		}
	}
}