Java basic- OOP - căn bản - Tổng hợp ví dụ lập trính hướng đổi tượng trong java - mới bắt đầu với OOP
Bài tập 1:
Tạo class Book có các thuộc tính: Tên sách, tác giả số trang, giá tiền.
- Tạo 2 constructor (1 có tham số và một không có tham số).
- Tạo phương thức nhập và hiển thị.
Tạo class BookTest và khai báo hàm main.
- Tạo 2 đối tượng của lớp Book. Một đối tượng được khởi tạo bằng constructor không có tham số và sau đó gọi hàm nhập.
- Đối tượng còn lại khởi tạo bằng constructor có tham số.
Gọi phương thức hiển thị của 2 đối tượng này.
Bài tập 2:
Tạo class Product gồm các thuộc tính:
- Tên hàng hóa
- Nhà sản xuất
- Giá bán
+ Tạo 2 constructor cho lớp này.
+ Cài đặt hàm nhập và hiển thị.
Tạo class ProductMenu, khai báo hàm main và tạo menu sau:
1. Nhập thông tin cho n sản phẩm
2. Hiển thị thông tin vừa nhập
3. Sắp xếp thông tin giảm dần theo giá và hiển thị
4. Thoát.
Tags:
Phản hồi từ học viên
5
(Dựa trên đánh giá ngày hôm nay)
![Lê Xuân Dũng [JavaFree]](https://www.gravatar.com/avatar/af3e93d6e9bd94db12e2b8a1069aef68.jpg?s=80&d=mm&r=g){kind=avatar}
Lê Xuân Dũng
2020-03-22 10:18:52
//Bai 2:
package productmenu;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.Scanner;
public class ProductMenu {
public static void main(String[] args) {
int n, choose;
Scanner sc = new Scanner(System.in);
ArrayList<Product> productList = new ArrayList<>();
do{
System.out.println("1. Nhap thong tin N san pham.");
System.out.println("2. Hien thi thong tin vua nhap.");
System.out.println("3. Sap xem thong tin giam dan theo gia va hien thi");
System.out.println("4. Thoat");
System.out.println("==============================");
choose = Integer.parseInt(sc.nextLine());
switch(choose){
case 1:
System.out.println("Nhap thong tin cho n san pham:");
System.out.println("Nhap n= ");
n = Integer.parseInt(sc.nextLine());
for(int i = 0; i < n; i++){
Product product = new Product();
product.nhapHang();
productList.add(product);
}
break;
case 2:
for(int i = 0; i < productList.size(); i++){
productList.get(i).hienthiHang();
}
break;
case 3:
Collections.sort(productList, new Comparator<Product>() {//anonymous class
@Override
public int compare(Product o1, Product o2) {
if(o1.getGia() < o2.getGia()){
return 1;
} else if(o1.getGia() > o2.getGia()){
return -1;
} else {
return 0;
}
}
});
for(int i = 0; i < productList.size(); i++){
productList.get(i).hienthiHang();
}
case 4:
System.out.println("Thoat");
break;
default:
System.out.println("Nhap sai! Moi nhap lai!");
break;
}
} while (choose!=4);
}
}
package productmenu;
import java.util.Scanner;
public class Product {
String ten;
String NSX;
int gia;
public Product() {
}
public Product(String ten, String NSX, int gia) {
this.ten = ten;
this.NSX = NSX;
this.gia = gia;
}
public String getTen() {
return ten;
}
public void setTen(String ten) {
this.ten = ten;
}
public String getNSX() {
return NSX;
}
public void setNSX(String NSX) {
this.NSX = NSX;
}
public int getGia() {
return gia;
}
public void setGia(int gia) {
this.gia = gia;
}
public void nhapHang(){
System.out.println("Nhap thong tin hang hoa");
Scanner sc = new Scanner(System.in);
System.out.println("Nhap ten hang hoa: ");
this.ten = sc.nextLine();
System.out.println("Nhap nha san xuat: ");
this.NSX = sc.nextLine();
System.out.println("Nhap gia: ");
this.gia = Integer.parseInt(sc.nextLine());
System.out.println("==============================");
}
public void hienthiHang() {
System.out.println("Ten hang: "+this.ten);
System.out.println("Nha san xuat: "+this.NSX);
System.out.println("Gia: "+this.gia);
System.out.println("==============================");
}
}
![Phạm Kim Anh [JavaFree]](https://www.gravatar.com/avatar/2a2cc19e3234e41e7f8a049d835aaac7.jpg?s=80&d=mm&r=g){kind=avatar}
Phạm Kim Anh
2020-03-21 14:21:51
package gokisoft.com;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.Scanner;
public class ProductMenu {
public static void main(String[] args) {
int choose;
boolean exit = false;
Scanner sc = new Scanner(System.in);
ArrayList<Product>listP = new ArrayList<Product>();
do {
menu();
System.out.println("Moi ban nhap lua chon: ");
choose = Integer.parseInt(sc.nextLine());
switch(choose) {
case 1:
System.out.println("Nhap so luong san pham ban muon them: ");
int n = Integer.parseInt(sc.nextLine());
for(int i = 0; i < n; i++) {
Product p = new Product();
p.nhap(listP);
listP.add(p);
}
break;
case 2:
for(Product p : listP) {
p.xuat();
}
break;
case 3:
Collections.sort(listP, new Comparator<Product>() {
@Override
public int compare(Product o1, Product o2) {
// TODO Auto-generated method stub
return o1.getGiaBan() >= o2.getGiaBan() ? -1:1;
}
});
for(int i = 0; i < listP.size(); i++) {
listP.get(i).xuat();
}
break;
case 4:
System.out.println("Cam on ban da su dung tien ich! ");
exit = true;
break;
default:
System.out.println("Moi ban nhap lua chon!");
break;
}
}while(choose != 4);
}
static void menu() {
System.out.println("=======================================================");
System.out.println("1. Nhap thong tin cho n san pham.");
System.out.println("2. Hien thi thong tin vua nhap.");
System.out.println("3. Sap xep thong tin giam dan theo gia va hien thi.");
System.out.println("4. Thoat.");
System.out.println("=======================================================");
}
}
Phạm Kim Anh
2020-03-21 14:21:28
package gokisoft.com;
import java.util.ArrayList;
import java.util.Scanner;
public class Product {
String tenHangHoa;
String nhaSanXuat;
double giaBan;
public Product() {
// TODO Auto-generated constructor stub
}
/**
* @param tenHangHoa
* @param nhaSanXuat
* @param giaBan
*/
public Product(String tenHangHoa, String nhaSanXuat, double giaBan) {
super();
this.tenHangHoa = tenHangHoa;
this.nhaSanXuat = nhaSanXuat;
this.giaBan = giaBan;
}
public void nhap() {
Scanner sc = new Scanner(System.in);
System.out.println("Moi ban nhap ten hang hoa: ");
tenHangHoa = sc.nextLine();
System.out.println("Moi ban nhap nha san xuat: ");
nhaSanXuat = sc.nextLine();
System.out.println("Moi ban nhap gia ban: ");
giaBan = Double.parseDouble(sc.nextLine());
}
public void nhap(ArrayList<Product>listP) {
Scanner sc = new Scanner(System.in);
System.out.println("Moi ban nhap ten hang hoa: ");
tenHangHoa = sc.nextLine();
System.out.println("Moi ban nhap nha san xuat: ");
nhaSanXuat = sc.nextLine();
System.out.println("Moi ban nhap gia ban: ");
giaBan = Double.parseDouble(sc.nextLine());
}
public void xuat() {
System.out.println("Ten hang hoa: " + tenHangHoa);
System.out.println("Nha san xuat: "+nhaSanXuat);
System.out.println("Gia ban: "+giaBan);
System.out.println();
}
public String getTenHangHoa() {
return tenHangHoa;
}
public void setTenHangHoa(String tenHangHoa) {
this.tenHangHoa = tenHangHoa;
}
public String getNhaSanXuat() {
return nhaSanXuat;
}
public void setNhaSanXuat(String nhaSanXuat) {
this.nhaSanXuat = nhaSanXuat;
}
public double getGiaBan() {
return giaBan;
}
public void setGiaBan(double giaBan) {
this.giaBan = giaBan;
}
}
Phạm Kim Anh
2020-03-21 14:21:08
package gokisoft.com;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.Scanner;
public class ProductMenu {
public static void main(String[] args) {
int choose;
boolean exit = false;
Scanner sc = new Scanner(System.in);
ArrayList<Product>listP = new ArrayList<Product>();
do {
menu();
System.out.println("Moi ban nhap lua chon: ");
choose = Integer.parseInt(sc.nextLine());
switch(choose) {
case 1:
System.out.println("Nhap so luong san pham ban muon them: ");
int n = Integer.parseInt(sc.nextLine());
for(int i = 0; i < n; i++) {
Product p = new Product();
p.nhap(listP);
listP.add(p);
}
break;
case 2:
for(Product p : listP) {
p.xuat();
}
break;
case 3:
Collections.sort(listP, new Comparator<Product>() {
@Override
public int compare(Product o1, Product o2) {
// TODO Auto-generated method stub
return o1.getGiaBan() >= o2.getGiaBan() ? -1:1;
}
});
for(int i = 0; i < listP.size(); i++) {
listP.get(i).xuat();
}
break;
case 4:
System.out.println("Cam on ban da su dung tien ich! ");
exit = true;
break;
default:
System.out.println("Moi ban nhap lua chon!");
break;
}
}while(choose != 4);
}
static void menu() {
System.out.println("=======================================================");
System.out.println("1. Nhap thong tin cho n san pham.");
System.out.println("2. Hien thi thong tin vua nhap.");
System.out.println("3. Sap xep thong tin giam dan theo gia va hien thi.");
System.out.println("4. Thoat.");
System.out.println("=======================================================");
}
}
package gokisoft.com;
import java.util.ArrayList;
import java.util.Scanner;
public class Product {
String tenHangHoa;
String nhaSanXuat;
double giaBan;
public Product() {
// TODO Auto-generated constructor stub
}
/**
* @param tenHangHoa
* @param nhaSanXuat
* @param giaBan
*/
public Product(String tenHangHoa, String nhaSanXuat, double giaBan) {
super();
this.tenHangHoa = tenHangHoa;
this.nhaSanXuat = nhaSanXuat;
this.giaBan = giaBan;
}
public void nhap() {
Scanner sc = new Scanner(System.in);
System.out.println("Moi ban nhap ten hang hoa: ");
tenHangHoa = sc.nextLine();
System.out.println("Moi ban nhap nha san xuat: ");
nhaSanXuat = sc.nextLine();
System.out.println("Moi ban nhap gia ban: ");
giaBan = Double.parseDouble(sc.nextLine());
}
public void nhap(ArrayList<Product>listP) {
Scanner sc = new Scanner(System.in);
System.out.println("Moi ban nhap ten hang hoa: ");
tenHangHoa = sc.nextLine();
System.out.println("Moi ban nhap nha san xuat: ");
nhaSanXuat = sc.nextLine();
System.out.println("Moi ban nhap gia ban: ");
giaBan = Double.parseDouble(sc.nextLine());
}
public void xuat() {
System.out.println("Ten hang hoa: " + tenHangHoa);
System.out.println("Nha san xuat: "+nhaSanXuat);
System.out.println("Gia ban: "+giaBan);
System.out.println();
}
public String getTenHangHoa() {
return tenHangHoa;
}
public void setTenHangHoa(String tenHangHoa) {
this.tenHangHoa = tenHangHoa;
}
public String getNhaSanXuat() {
return nhaSanXuat;
}
public void setNhaSanXuat(String nhaSanXuat) {
this.nhaSanXuat = nhaSanXuat;
}
public double getGiaBan() {
return giaBan;
}
public void setGiaBan(double giaBan) {
this.giaBan = giaBan;
}
}
Phạm Kim Anh
2020-03-21 14:21:08
package gokisoft.com;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.Scanner;
public class ProductMenu {
public static void main(String[] args) {
int choose;
boolean exit = false;
Scanner sc = new Scanner(System.in);
ArrayList<Product>listP = new ArrayList<Product>();
do {
menu();
System.out.println("Moi ban nhap lua chon: ");
choose = Integer.parseInt(sc.nextLine());
switch(choose) {
case 1:
System.out.println("Nhap so luong san pham ban muon them: ");
int n = Integer.parseInt(sc.nextLine());
for(int i = 0; i < n; i++) {
Product p = new Product();
p.nhap(listP);
listP.add(p);
}
break;
case 2:
for(Product p : listP) {
p.xuat();
}
break;
case 3:
Collections.sort(listP, new Comparator<Product>() {
@Override
public int compare(Product o1, Product o2) {
// TODO Auto-generated method stub
return o1.getGiaBan() >= o2.getGiaBan() ? -1:1;
}
});
for(int i = 0; i < listP.size(); i++) {
listP.get(i).xuat();
}
break;
case 4:
System.out.println("Cam on ban da su dung tien ich! ");
exit = true;
break;
default:
System.out.println("Moi ban nhap lua chon!");
break;
}
}while(choose != 4);
}
static void menu() {
System.out.println("=======================================================");
System.out.println("1. Nhap thong tin cho n san pham.");
System.out.println("2. Hien thi thong tin vua nhap.");
System.out.println("3. Sap xep thong tin giam dan theo gia va hien thi.");
System.out.println("4. Thoat.");
System.out.println("=======================================================");
}
}
package gokisoft.com;
import java.util.ArrayList;
import java.util.Scanner;
public class Product {
String tenHangHoa;
String nhaSanXuat;
double giaBan;
public Product() {
// TODO Auto-generated constructor stub
}
/**
* @param tenHangHoa
* @param nhaSanXuat
* @param giaBan
*/
public Product(String tenHangHoa, String nhaSanXuat, double giaBan) {
super();
this.tenHangHoa = tenHangHoa;
this.nhaSanXuat = nhaSanXuat;
this.giaBan = giaBan;
}
public void nhap() {
Scanner sc = new Scanner(System.in);
System.out.println("Moi ban nhap ten hang hoa: ");
tenHangHoa = sc.nextLine();
System.out.println("Moi ban nhap nha san xuat: ");
nhaSanXuat = sc.nextLine();
System.out.println("Moi ban nhap gia ban: ");
giaBan = Double.parseDouble(sc.nextLine());
}
public void nhap(ArrayList<Product>listP) {
Scanner sc = new Scanner(System.in);
System.out.println("Moi ban nhap ten hang hoa: ");
tenHangHoa = sc.nextLine();
System.out.println("Moi ban nhap nha san xuat: ");
nhaSanXuat = sc.nextLine();
System.out.println("Moi ban nhap gia ban: ");
giaBan = Double.parseDouble(sc.nextLine());
}
public void xuat() {
System.out.println("Ten hang hoa: " + tenHangHoa);
System.out.println("Nha san xuat: "+nhaSanXuat);
System.out.println("Gia ban: "+giaBan);
System.out.println();
}
public String getTenHangHoa() {
return tenHangHoa;
}
public void setTenHangHoa(String tenHangHoa) {
this.tenHangHoa = tenHangHoa;
}
public String getNhaSanXuat() {
return nhaSanXuat;
}
public void setNhaSanXuat(String nhaSanXuat) {
this.nhaSanXuat = nhaSanXuat;
}
public double getGiaBan() {
return giaBan;
}
public void setGiaBan(double giaBan) {
this.giaBan = giaBan;
}
}
Phạm Kim Anh
2020-03-21 13:51:26
package gokisoft.com;
import java.util.Scanner;
public class Book {
String tenSach;
String tacGia;
int soTrang;
double giaTien;
public Book() {
// TODO Auto-generated constructor stub
}
/**
* @param tenSach
* @param tacGia
* @param soTrang
* @param giaTien
*/
public Book(String tenSach, String tacGia, int soTrang, double giaTien) {
super();
this.tenSach = tenSach;
this.tacGia = tacGia;
this.soTrang = soTrang;
this.giaTien = giaTien;
}
public String getTenSach() {
return tenSach;
}
public void setTenSach(String tenSach) {
this.tenSach = tenSach;
}
public String getTacGia() {
return tacGia;
}
public void setTacGia(String tacGia) {
this.tacGia = tacGia;
}
public int getSoTrang() {
return soTrang;
}
public void setSoTrang(int soTrang) {
this.soTrang = soTrang;
}
public double getGiaTien() {
return giaTien;
}
public void setGiaTien(double giaTien) {
this.giaTien = giaTien;
}
public void nhap() {
Scanner sc = new Scanner(System.in);
System.out.println("Moi ban nhap ten sach: ");
tenSach = sc.nextLine();
System.out.println("Moi ban nhap tac gia: ");
tacGia = sc.nextLine();
System.out.println("Moi ban nhap so trang: ");
soTrang = Integer.parseInt(sc.nextLine());
System.out.println("Moi ban nhap gia tien: ");
giaTien = Double.parseDouble(sc.nextLine());
}
public void xuat() {
System.out.println(toString());
System.out.println();
}
@Override
public String toString() {
return " tenSach=" + tenSach + "\n tacGia=" + tacGia + "\n soTrang=" + soTrang + "\n giaTien=" + giaTien;
}
}
package gokisoft.com;
public class BookTest {
public static void main(String[] args) {
//tao doi tuong book 1
Book b1 = new Book();
//tao doi tuong book 2
Book b2 = new Book("Nha gia kim", "Paulo Coelho" , 228, 69.000f);
b1.nhap();
b1.xuat();
b2.xuat();
}
}
package gokisoft.com;
import java.util.Scanner;
public class Book {
String tenSach;
String tacGia;
int soTrang;
double giaTien;
public Book() {
// TODO Auto-generated constructor stub
}
/**
* @param tenSach
* @param tacGia
* @param soTrang
* @param giaTien
*/
public Book(String tenSach, String tacGia, int soTrang, double giaTien) {
super();
this.tenSach = tenSach;
this.tacGia = tacGia;
this.soTrang = soTrang;
this.giaTien = giaTien;
}
public String getTenSach() {
return tenSach;
}
public void setTenSach(String tenSach) {
this.tenSach = tenSach;
}
public String getTacGia() {
return tacGia;
}
public void setTacGia(String tacGia) {
this.tacGia = tacGia;
}
public int getSoTrang() {
return soTrang;
}
public void setSoTrang(int soTrang) {
this.soTrang = soTrang;
}
public double getGiaTien() {
return giaTien;
}
public void setGiaTien(double giaTien) {
this.giaTien = giaTien;
}
public void nhap() {
Scanner sc = new Scanner(System.in);
System.out.println("Moi ban nhap ten sach: ");
tenSach = sc.nextLine();
System.out.println("Moi ban nhap tac gia: ");
tacGia = sc.nextLine();
System.out.println("Moi ban nhap so trang: ");
soTrang = Integer.parseInt(sc.nextLine());
System.out.println("Moi ban nhap gia tien: ");
giaTien = Double.parseDouble(sc.nextLine());
}
public void xuat() {
System.out.println(toString());
System.out.println();
}
@Override
public String toString() {
return " tenSach=" + tenSach + "\n tacGia=" + tacGia + "\n soTrang=" + soTrang + "\n giaTien=" + giaTien;
}
}
package gokisoft.com;
import java.util.Scanner;
public class Book {
String tenSach;
String tacGia;
int soTrang;
double giaTien;
public Book() {
// TODO Auto-generated constructor stub
}
/**
* @param tenSach
* @param tacGia
* @param soTrang
* @param giaTien
*/
public Book(String tenSach, String tacGia, int soTrang, double giaTien) {
super();
this.tenSach = tenSach;
this.tacGia = tacGia;
this.soTrang = soTrang;
this.giaTien = giaTien;
}
public String getTenSach() {
return tenSach;
}
public void setTenSach(String tenSach) {
this.tenSach = tenSach;
}
public String getTacGia() {
return tacGia;
}
public void setTacGia(String tacGia) {
this.tacGia = tacGia;
}
public int getSoTrang() {
return soTrang;
}
public void setSoTrang(int soTrang) {
this.soTrang = soTrang;
}
public double getGiaTien() {
return giaTien;
}
public void setGiaTien(double giaTien) {
this.giaTien = giaTien;
}
public void nhap() {
Scanner sc = new Scanner(System.in);
System.out.println("Moi ban nhap ten sach: ");
tenSach = sc.nextLine();
System.out.println("Moi ban nhap tac gia: ");
tacGia = sc.nextLine();
System.out.println("Moi ban nhap so trang: ");
soTrang = Integer.parseInt(sc.nextLine());
System.out.println("Moi ban nhap gia tien: ");
giaTien = Double.parseDouble(sc.nextLine());
}
public void xuat() {
System.out.println(toString());
System.out.println();
}
@Override
public String toString() {
return " tenSach=" + tenSach + "\n tacGia=" + tacGia + "\n soTrang=" + soTrang + "\n giaTien=" + giaTien;
}
}
Phạm Kim Anh
2020-03-21 13:50:48
package gokisoft.com;
import java.util.Scanner;
public class Book {
String tenSach;
String tacGia;
int soTrang;
double giaTien;
public Book() {
// TODO Auto-generated constructor stub
}
/**
* @param tenSach
* @param tacGia
* @param soTrang
* @param giaTien
*/
public Book(String tenSach, String tacGia, int soTrang, double giaTien) {
super();
this.tenSach = tenSach;
this.tacGia = tacGia;
this.soTrang = soTrang;
this.giaTien = giaTien;
}
public String getTenSach() {
return tenSach;
}
public void setTenSach(String tenSach) {
this.tenSach = tenSach;
}
public String getTacGia() {
return tacGia;
}
public void setTacGia(String tacGia) {
this.tacGia = tacGia;
}
public int getSoTrang() {
return soTrang;
}
public void setSoTrang(int soTrang) {
this.soTrang = soTrang;
}
public double getGiaTien() {
return giaTien;
}
public void setGiaTien(double giaTien) {
this.giaTien = giaTien;
}
public void nhap() {
Scanner sc = new Scanner(System.in);
System.out.println("Moi ban nhap ten sach: ");
tenSach = sc.nextLine();
System.out.println("Moi ban nhap tac gia: ");
tacGia = sc.nextLine();
System.out.println("Moi ban nhap so trang: ");
soTrang = Integer.parseInt(sc.nextLine());
System.out.println("Moi ban nhap gia tien: ");
giaTien = Double.parseDouble(sc.nextLine());
}
public void xuat() {
System.out.println(toString());
System.out.println();
}
@Override
public String toString() {
return " tenSach=" + tenSach + "\n tacGia=" + tacGia + "\n soTrang=" + soTrang + "\n giaTien=" + giaTien;
}
}
package gokisoft.com;
public class BookTest {
public static void main(String[] args) {
//tao doi tuong book 1
Book b1 = new Book();
//tao doi tuong book 2
Book b2 = new Book("Nha gia kim", "Paulo Coelho" , 228, 69.000f);
b1.nhap();
b1.xuat();
b2.xuat();
}
}
Phạm Kim Anh
2020-03-21 13:50:33
package gokisoft.com;
import java.util.Scanner;
public class Book {
String tenSach;
String tacGia;
int soTrang;
double giaTien;
public Book() {
// TODO Auto-generated constructor stub
}
/**
* @param tenSach
* @param tacGia
* @param soTrang
* @param giaTien
*/
public Book(String tenSach, String tacGia, int soTrang, double giaTien) {
super();
this.tenSach = tenSach;
this.tacGia = tacGia;
this.soTrang = soTrang;
this.giaTien = giaTien;
}
public String getTenSach() {
return tenSach;
}
public void setTenSach(String tenSach) {
this.tenSach = tenSach;
}
public String getTacGia() {
return tacGia;
}
public void setTacGia(String tacGia) {
this.tacGia = tacGia;
}
public int getSoTrang() {
return soTrang;
}
public void setSoTrang(int soTrang) {
this.soTrang = soTrang;
}
public double getGiaTien() {
return giaTien;
}
public void setGiaTien(double giaTien) {
this.giaTien = giaTien;
}
public void nhap() {
Scanner sc = new Scanner(System.in);
System.out.println("Moi ban nhap ten sach: ");
tenSach = sc.nextLine();
System.out.println("Moi ban nhap tac gia: ");
tacGia = sc.nextLine();
System.out.println("Moi ban nhap so trang: ");
soTrang = Integer.parseInt(sc.nextLine());
System.out.println("Moi ban nhap gia tien: ");
giaTien = Double.parseDouble(sc.nextLine());
}
public void xuat() {
System.out.println(toString());
System.out.println();
}
@Override
public String toString() {
return " tenSach=" + tenSach + "\n tacGia=" + tacGia + "\n soTrang=" + soTrang + "\n giaTien=" + giaTien;
}
}
Lê Xuân Dũng
2020-03-21 09:21:18
//Bai 1:
package booktest;
import java.util.Scanner;
public class Book {
String bookName;
String Author;
int pageNumber;
int price;
public Book() {
}
public Book(String bookName, String Author, int pageNumber, int price) {
this.bookName = bookName;
this.Author = Author;
this.pageNumber = pageNumber;
this.price = price;
}
public void addBook(){
System.out.println("Nhap thong tin sach: ");
Scanner sc = new Scanner(System.in);
System.out.println("Nhap ten sach: ");
this.bookName = sc.nextLine();
System.out.println("Nhap ten tac gia: ");
this.Author = sc.nextLine();
System.out.println("Nhap so trang: ");
this.pageNumber = Integer.parseInt(sc.nextLine());
System.out.println("Nhap gia tien: ");
this.price = Integer.parseInt(sc.nextLine());
}
public void showBook(){
System.out.println("==============================");
System.out.println("Ten sach: "+this.bookName);
System.out.println("Tac gia: "+this.Author);
System.out.println("So trang: "+this.pageNumber);
System.out.println("Gia tien: "+this.price);
System.out.println("==============================");
}
}
package booktest;
public class BookTest {
public static void main(String[] args) {
Book book1 = new Book();
book1.addBook();
Book book2 = new Book("Thien Long Bat Bo", "Kim Dung", 2123, 686000);
book1.showBook();
book2.showBook();
}
}
![Minh Nghia [T1907A]](https://www.gravatar.com/avatar/ecca255d725eed36a872105205af1b8e.jpg?s=80&d=mm&r=g){kind=avatar}
Minh Nghia
2020-03-19 06:43:19
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package Bt44;
import java.util.Scanner;
/**
*
* @author Administrator
*/
public class Book {
String nameBook;
String Author;
int numberOfPage;
int price;
public Book() {
}
public Book(String nameBook, String Author, int numberOfPage, int price) {
this.nameBook = nameBook;
this.Author = Author;
this.numberOfPage = numberOfPage;
this.price = price;
}
public void input(){
Scanner scan = new Scanner(System.in);
System.out.println("Nhap ten sach:");
nameBook = scan.nextLine();
System.out.println("Nhap ten tac gia:");
Author = scan.nextLine();
System.out.println("Nhap so trang:");
numberOfPage = Integer.parseInt(scan.nextLine());
System.out.println("Nhap gia ban:");
price = Integer.parseInt(scan.nextLine());
}
public void display(){
System.out.println(toString());
}
@Override
public String toString() {
return "/nBook{" + "nameBook=" + nameBook + ", Author=" + Author + ", numberOfPage=" + numberOfPage + ", price=" + price + '}';
}
}
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package Bt44;
/**
*
* @author Administrator
*/
public class bookTest {
public static void main(String[] args) {
Book book = new Book();
book.input();
Book book1 = new Book(book.nameBook,book.Author,book.numberOfPage,book.price);
book.display();
book1.display();
}
}
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package Bt44;
import java.util.Scanner;
/**
*
* @author Administrator
*/
public class Product {
String goodsName;
String producer;
int price;
public Product() {
}
public Product(String goodsName, String producer, int price) {
this.goodsName = goodsName;
this.producer = producer;
this.price = price;
}
public String getGoodsName() {
return goodsName;
}
public void setGoodsName(String goodsName) {
this.goodsName = goodsName;
}
public String getProducer() {
return producer;
}
public void setProducer(String producer) {
this.producer = producer;
}
public int getPrice() {
return price;
}
public void setPrice(int price) {
this.price = price;
}
public void input(){
Scanner scan = new Scanner(System.in);
System.out.println("Nhap ten hang hoa:");
goodsName = scan.nextLine();
System.out.println("Nhap ten nsx:");
producer = scan.nextLine();
System.out.println("Nhap gia ban:");
price = Integer.parseInt(scan.nextLine());
}
public void display(){
System.out.println("Ten hang san xuat:" + goodsName);
System.out.println("Ten nha sx:" + producer);
System.out.println("Gia ban:" + price);
}
}
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package Bt44;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.Scanner;
/**
*
* @author Administrator
*/
public class productMenu {
public static void main(String[] args) {
int choose;
Scanner scan = new Scanner(System.in);
ArrayList<Product> list = new ArrayList();
do{
showMenu();
choose = Integer.parseInt(scan.nextLine());
switch(choose){
case 1:
System.out.println("Nhap thong tin cho N sp:");
int n = Integer.parseInt(scan.nextLine());
for(int i = 0; i < n; i++){
Product product = new Product();
product.input();
list.add(product);
}
break;
case 2:
for(int i = 0; i < list.size(); i++){
list.get(i).display();
}
break;
case 3:
Collections.sort(list, new Comparator<Product>() {
@Override
public int compare(Product o1, Product o2) {
if(o1.getPrice() < o2.getPrice()){
return 1;
}
return -1;
}
});
for (int i = 0; i < list.size(); i++){
list.get(i).display();
}
break;
case 4:
System.out.println("Thoat");
break;
default:
System.out.println("Chon lai");
break;
}
}while(choose != 4);
}
public static void showMenu(){
System.out.println("1. Nhap thong tin N san pham.");
System.out.println("2. Hien thi thong tin vua nhap.");
System.out.println("3. Sap xem thong tin giam dan theo gia va hien thi");
System.out.println("4. Thoat");
System.out.println("Chon lai:");
}
}
