Quanlysinhvien kieu array list

Main.java

package SinhVien;

public class Main {
    public static void main(String[] args) 
    {
        QLSV2 ql = new QLSV2();
        ql.nhap();
        ql.in();
        ql.timdiem();
        ql.timsinhvien(3);
        
    }
}

QLSV.Java

package SinhVien;


import java.util.ArrayList;
import java.util.Scanner;


public class QLSV2 {
    ArrayList<SinhVien>  sinhvien = new ArrayList<SinhVien>();
    SinhVien sv = new SinhVien();
    
    
    public void nhap(){
        Scanner scan = new Scanner(System.in);
        System.out.print("nhap sinh so sinh vien: ");
        int n = scan.nextInt();
        for(int i =0 ;  i < n ;  i++){
            sv.nhapThongTinSV();
            sinhvien.add(sv);
        }
    }
    public void in()
    {
        for(SinhVien sv : sinhvien)
        {
            sv.xuatThongTinSV();
        }
    }
    
    public void timdiem(){
        for(SinhVien sv :  sinhvien){
            if(sv.diem < 4){
                sv.xuatThongTinSV();
            }
        }
    }
    
    public void timsinhvien(double diem){
        for(SinhVien sv :  sinhvien){
            if(sv.diem < diem && sv.getHoVaTen().equals("Nguyen van")){
                sv.xuatThongTinSV();
            }
        }
    }
}

SinhVien.Java

package SinhVien;

import java.util.Scanner;


public class SinhVien 
{
    private String hoVaTen;
    private int tuoi;
    private String diaChi;
    private int soDienThoai;
    private String Email;
    double diem;

    public double getDiem() {
        return diem;
    }

    public void setDiem(double diem) {
        this.diem = diem;
    }
    

    public String getHoVaTen() {
        return hoVaTen;
    }

    public void setHoVaTen(String hoVaTen) {
        this.hoVaTen = hoVaTen;
    }

    public int getTuoi() {
        return tuoi;
    }

    public void setTuoi(int tuoi) {
        this.tuoi = tuoi;
    }

    public String getDiaChi() {
        return diaChi;
    }

    public void setDiaChi(String diaChi) {
        this.diaChi = diaChi;
    }

    public int getSoDienThoai() {
        return soDienThoai;
    }

    public void setSoDienThoai(int soDienThoai) {
        this.soDienThoai = soDienThoai;
    }

    public String getEmail() {
        return Email;
    }

    public void setEmail(String Email) {
        this.Email = Email;
    }
    
    protected void nhapThongTinSV()
    {
        Scanner inp = new Scanner(System.in);
        System.out.print("nhap vao ho ten sinh vien: ");
        this.hoVaTen = inp.nextLine();
        System.out.print("nhap vao Email: ");
        this.Email  = inp.nextLine();
        System.out.print("nhap vao dia chi : ");
        this.diaChi = inp.nextLine();
        System.out.print("nhap vao so dien thoai: ");
        this.soDienThoai = inp.nextInt();
        System.out.print("nhap vao tuoi sinh vien: ");
        this.tuoi = inp.nextInt();
        System.out.print("nhap vao diem: ");
        this.diem = inp.nextInt();
        inp.hasNextLine();
    }
    
    protected void xuatThongTinSV()
    {
        System.out.println("Thong tin sinh vien : ");
        System.out.println(" Ho va ten: "+this.hoVaTen);
        System.out.println(" Tuoi: "+this.tuoi);
        System.out.println("Dia chi: "+this.diaChi);
        System.out.println("So dien thoai : "+this.soDienThoai);
        System.out.println("Dia chi email: "+this.Email);
        System.out.println("Diem : "+this.diem);
    }   
}