[Java的] 锻炼Java库管理
主题:
库来管理文件包括：, 书, 刊物, 报纸
+ 每个文件都有属性: 文档代码, 版本说明, 版本号.
+ 这些书需要管理: 作者名称, 页数
+ 期刊需要管理: 发行数量, 可能释放
+ 报纸应管理: 发布日期.
1. 施工层来管理如何得到最重用的文档类型.
2. 建设QLThuVien类安装方法执行以下任务:
+ 输入信息的N个文档的列表
+ 显示有关导入文档信息
乔国防部代码congdongjava.com
import java.util.Scanner;
class TaiLieu {
String maTaiLieu, tenNhaXuatBan;
int soBanPhatHanh;
Scanner scan = new Scanner(System.in);
public void input( ) {
System.out.print("Nhap ma tai lieu: ");
maTaiLieu = scan.nextLine();
System.out.print("Nhap ten nha xuat ban: ");
tenNhaXuatBan = scan.nextLine();
System.out.print("Nhap so ban phat hanh: ");
soBanPhatHanh = scan.nextInt();
//scan.nextLine();
//scan.close();
}
public void output( ) {
System.out.printf("%20s %20s %20s %20s %20s %20s %20s %20sn",
"Ma Tai Lieu", "Nha Xuat Ban", "So Ban Phat Hanh",
"Tac Gia Sach", "So Trang Sach", "So Phat Hanh",
"Thang Phat Hanh", "Ngay Phat Hanh");
System.out.printf("%20s %20s %20d", maTaiLieu,
tenNhaXuatBan, soBanPhatHanh);
}
public void close() {
scan.close();
}
}
class Sach extends TaiLieu implements Type {
String tenTacGia;
int soTrang;
@Override
public void input( ) {
super.input( );
System.out.print("Nhap ten tac gia cuon sach: ");
tenTacGia = scan.nextLine();
System.out.print("Nhap so trang cuon sach: ");
soTrang = scan.nextInt();
//scan.nextLine();
//scan.close();
}
public void output( ) {
super.output();
System.out.printf("%20s %20d %20s %20s %20s", tenTacGia,
soTrang, " ", " ", " ");
}
}
class TapChi extends TaiLieu implements Type {
String soPhatHanh;
int thangPhatHanh;
@Override
public void input( ) {
}
public void output( ) {
System.out.printf("%20s %20s %20s %20d %20s", " ", " ",
soPhatHanh, thangPhatHanh, " ");
}
}
class Bao extends TaiLieu implements Type {
int ngayPhatHanh;
@Override
public void input( ) {
}
public void output( ) {
System.out.printf("%20s %20s %20s %20d %20s", " ", " ", " ",
ngayPhatHanh, " ");
}
}
interface Type {
public void input( );
public void output( );
}
public class QuanLyThuVien {
int n;
TaiLieu taiLieu[];
public void input() {
Scanner scan = new Scanner(System.in);
System.out.print("Nhap so tai lieu: ");
n = scan.nextInt();
scan.nextLine();
taiLieu = new TaiLieu[n];
for (int i = 0; i < n; i++) {
System.out.print("Nhap loai tai lieu: (sach, tapchi, bao) ");
String loai = scan.nextLine();
if (loai.equals("sach")) taiLieu[i] = new Sach();
else if (loai.equals("tapchi")) taiLieu[i] = new TapChi();
else if (loai.equals("bao")) taiLieu[i] = new Bao();
else continue;
taiLieu[i].input();
}
scan.close();
}
public void output() {
for (int i = 0; i < n; i++) {
taiLieu[i].output();
}
}
public static void main(String[] args) {
QuanLyThuVien ql = new QuanLyThuVien();
ql.input();
ql.output();
}
}
但是这样做，如果想从任何信息 1 具体的目标是不 (VD输出命名文档的作者，如果它是第i个) 毕竟我不得不换 1 代码如下所示纳.
package School;
import java.util.Scanner;
class TaiLieu {
private String maTaiLieu, tenNhaXuatBan;
private int soBanPhatHanh;
Scanner scan = new Scanner(System.in);
public void input() {
System.out.print("Nhap ma tai lieu: ");
maTaiLieu = scan.nextLine();
System.out.print("Nhap ten nha xuat ban: ");
tenNhaXuatBan = scan.nextLine();
System.out.print("Nhap so ban phat hanh: ");
soBanPhatHanh = Integer.parseInt(scan.nextLine());
}
public void ouputTitle() {
System.out.printf("%-20s %-20s %-20s %-20s %-20s %-20s %-20s %-20sn",
"Ma Tai Lieu", "Nha Xuat Ban", "So Ban Phat Hanh",
"Tac Gia Sach", "So Trang Sach", "So Phat Hanh",
"Thang Phat Hanh", "Ngay Phat Hanh");
}
public void output() {
System.out.printf("%-20s %-20s %-20d", maTaiLieu, tenNhaXuatBan,
soBanPhatHanh);
}
}
class Sach extends TaiLieu {
private String tenTacGia;
private int soTrang;
public String getTenTacGia() {
return tenTacGia;
}
public void setTenTacGia(String tenTacGia) {
this.tenTacGia = tenTacGia;
}
public int getSoTrang() {
return soTrang;
}
public void setSoTrang(int soTrang) {
this.soTrang = soTrang;
}
@Override
public void input() {
Scanner scan = new Scanner(System.in);
super.input();
System.out.print("Nhap ten tac gia cuon sach: ");
tenTacGia = scan.nextLine();
System.out.print("Nhap so trang cuon sach: ");
soTrang = Integer.parseInt(scan.nextLine());
}
public void output() {
super.output();
System.out.printf("%-20s %-20d %-20s %-20s %-20sn", tenTacGia,
soTrang, " ", " ", " ");
}
}
class TapChi extends TaiLieu {
private int soPhatHanh;
private int thangPhatHanh;
public int getSoPhatHanh() {
return soPhatHanh;
}
public void setSoPhatHanh(int soPhatHanh) {
this.soPhatHanh = soPhatHanh;
}
public int getThangPhatHanh() {
return thangPhatHanh;
}
public void setThangPhatHanh(int thangPhatHanh) {
this.thangPhatHanh = thangPhatHanh;
}
@Override
public void input() {
Scanner scan = new Scanner(System.in);
super.input();
System.out.print("Nhap so phat hanh: ");
soPhatHanh = Integer.parseInt(scan.nextLine());
System.out.print("Nhap thang phat hanh: ");
thangPhatHanh = Integer.parseInt(scan.nextLine());
}
public void output() {
super.output();
System.out.printf("%-20s %-20s %-20s %-20d %-20sn", " ", " ",
soPhatHanh, thangPhatHanh, " ");
}
}
class Bao extends TaiLieu {
private int ngayPhatHanh;
public int getNgayPhatHanh() {
return ngayPhatHanh;
}
public void setNgayPhatHanh(int ngayPhatHanh) {
this.ngayPhatHanh = ngayPhatHanh;
}
@Override
public void input() {
Scanner scan = new Scanner(System.in);
super.input();
System.out.print("Nhap ngay phat hanh: ");
ngayPhatHanh = Integer.parseInt(scan.nextLine());
}
public void output() {
super.output();
System.out.printf("%-20s %-20s %-20s %-20d %-20sn", " ", " ", " ",
ngayPhatHanh, " ");
}
}
public class QuanLyThuVien {
int n;
TaiLieu taiLieu[];
public void input() {
Scanner scan = new Scanner(System.in);
System.out.print("Nhap so tai lieu: ");
n = Integer.parseInt(scan.nextLine());
taiLieu = new TaiLieu[n];
for (int i = 0; i < n; i++) {
System.out.print("Nhap loai tai lieu: (sach, tapchi, bao) ");
String loai = scan.nextLine();
if (loai.equals("sach"))
taiLieu[i] = new Sach();
else if (loai.equals("tapchi"))
taiLieu[i] = new TapChi();
else if (loai.equals("bao"))
taiLieu[i] = new Bao();
else {
--i;
continue;
}
taiLieu[i].input();
}
scan.close();
}
public void output() {
taiLieu[0].ouputTitle();
for (int i = 0; i < n; i++) {
taiLieu[i].output();
}
}
// Neu muon lay du lieu tu cac lop con
public void outputTenTacGia() {
for (int i = 0; i < n; i++) {
if (taiLieu[i] instanceof Sach)
System.out.println("Tac gia cuon sach thu " + (i + 1)
+ " la : " + ((Sach) taiLieu[i]).getTenTacGia());
}
}
public static void main(String[] args) {
QuanLyThuVien ql = new QuanLyThuVien();
ql.input();
ql.output();
ql.outputTenTacGia();
}
}
最新评论