201871010107-公海瑜《面向对象程序设计（Java）》第四周学习总结

package tiqu;
import java.util.Scanner;
public class tiqu {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner in = new Scanner(System.in);
        String ID = in.nextLine();
        String s1,s2,s3;
        int i = 6;
        s1 = ID.substring(i,i+4);
        s2 = ID.substring(i+4,i+6);
        s3 = ID.substring(i+6,i+8);
        System.out.println(s1+"-"+s2+"-"+s3);
    }

}

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Scanner;

public class Main1 {
    // private static Student students[];

    private static ArrayList<Student> list;

    public static void main(String[] args) {
        list = new ArrayList<>();
        Scanner in = new Scanner(System.in);
        try {
            readFile("studentfile.txt");
            System.out.println("请选择操作，1按姓名，2按学号，3退出");
            int i;
            while ((i = in.nextInt()) != 3) {
                switch (i) {
                case 1:
                    System.out.println("请输入姓名");
                    String name = in.next();
                    Student student = findStudentByName(name);
                    if (student == null) {
                        System.out.println("没找到");
                    } else {
                        System.out.println(student.toString());
                    }
                    System.out.println("请选择操作，1按姓名，2按学号，3退出");
                    break;
                case 2:
                    System.out.println("请输入学号");
                    String id = in.next();
                    Student student1 = findStudentById(id);
                    if (student1 == null) {
                        System.out.println("没找到");
                    } else {
                        System.out.println(student1.toString());

                    }
                    System.out.println("请选择操作，1按姓名，2按学号，3退出");
                    break;

                default:
                    System.out.println("输入有误");
                    System.out.println("请选择操作，1按姓名，2按学号，3退出");
                    break;
                }

            }
        } catch (IOException e) {
            // TODO 自动生成的 catch 块
            e.printStackTrace();
        }finally {
            in.close();
        }

    }

    public static void readFile(String path) throws IOException {
        FileReader reader = new FileReader(path);
        BufferedReader br = new BufferedReader(reader);
        String result;
        while ((result = br.readLine()) != null) {
            Student student = new Student();
            student.setName(result.substring(13));
            student.setID(result.substring(0,12));
            list.add(student);
        }
        br.close();
    }

    public static Student findStudentByName(String name) {
        for (Student student : list) {
            if (student.getName().equals(name)) {
                return student;
            }
        }
        return null;

    }

    public static Student findStudentById(String Id) {
        for (Student student : list) {
            if (student.getID().equals(Id)) {
                return student;
            }
        }
        return null;

    }
}

class Student {
    private String name;
    private String ID;

    public String getName() {
        return name;
    }

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

    public String getID() {
        return ID;
    }

    public void setID(String iD) {
        ID = iD;
    }

    @Override
    public String toString() {
        // TODO 自动生成的方法存根
        return "姓名是：" + name + "学号是：" + ID;
    }
}