refactor

library/Administrator.java

@@ -0,0 +1,57 @@
+package library;
+
+public class Administrator {
+    private int iId;
+    private String strName;
+    private Library lib;
+
+    public Administrator(int inId, String inName) {
+        this.iId = inId;
+        this.strName = inName;
+        this.lib = new Library();
+    }
+
+    public boolean register(Student st) {
+        for (Book bk : st.getBg().getLiBag())
+            if (!this.lib.del(bk)) {
+                System.out.println("Book not found in library: " + bk.getStrIsbn());
+                return false;
+            }
+        this.print(st);
+        return true;
+    }
+
+    private void print(Student st) {
+        System.out.println("Administrator ID: " + this.iId);
+        System.out.println("Administrator Name: " + this.strName);
+        System.out.println("Student ID: " + st.getiId());
+        System.out.println("Student Name: " + st.getStrName());
+        for (Book bk : st.getBg().getLiBag())
+            System.out.println(
+                    "Book ISBN: " + bk.getStrIsbn() + " Title: " + bk.getStrTitle() + " Count: " + bk.getiCount());
+    }
+
+    public int getiId() {
+        return iId;
+    }
+
+    public void setiId(int iId) {
+        this.iId = iId;
+    }
+
+    public String getStrName() {
+        return strName;
+    }
+
+    public void setStrName(String strName) {
+        this.strName = strName;
+    }
+
+    public Library getLib() {
+        return lib;
+    }
+
+    public void setLib(Library lib) {
+        this.lib = lib;
+    }
+}

library/Bag.java

@@ -0,0 +1,38 @@
+package library;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class Bag {
+    private List<Book> liBag;
+
+    public Bag() {
+        this.liBag = new ArrayList<Book>();
+    }
+
+    public void add(Book bk) {
+        this.liBag.add(bk);
+    }
+
+    public boolean del(String inIsbn) {
+        boolean flag = false;
+        Book tempBk;
+        for (int i = 0; i < this.liBag.size(); i++) {
+            tempBk = this.liBag.get(i);
+            if (tempBk.getStrIsbn().equals(inIsbn)) {
+                this.liBag.remove(i);
+                flag = true;
+                break;
+            }
+        }
+        return flag;
+    }
+
+    public List<Book> getLiBag() {
+        return liBag;
+    }
+
+    public void setLiBag(List<Book> liBag) {
+        this.liBag = liBag;
+    }
+}

library/Book.java

@@ -0,0 +1,37 @@
+package library;
+
+public class Book {
+    private String strIsbn;
+    private String strTitle;
+    private int iCount;
+
+    public Book(String inIsbn, String inTitle, int inCount) {
+        this.strIsbn = inIsbn;
+        this.strTitle = inTitle;
+        this.iCount = inCount;
+    }
+
+    public String getStrIsbn() {
+        return strIsbn;
+    }
+
+    public void setStrIsbn(String strIsbn) {
+        this.strIsbn = strIsbn;
+    }
+
+    public String getStrTitle() {
+        return strTitle;
+    }
+
+    public void setStrTitle(String strTitle) {
+        this.strTitle = strTitle;
+    }
+
+    public int getiCount() {
+        return iCount;
+    }
+
+    public void setiCount(int iCount) {
+        this.iCount = iCount;
+    }
+}

library/Library.java

@@ -0,0 +1,41 @@
+package library;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class Library {
+    private List<Book> liLib;
+
+    public Library() {
+        this.liLib = new ArrayList<Book>();
+    }
+
+    public void add(Book bk) {
+        Book tempBk;
+        for (int i = 0; i < this.liLib.size(); i++) {
+            tempBk = this.liLib.get(i);
+            if (tempBk.getStrIsbn().equals(bk.getStrIsbn())) {
+                tempBk.setiCount(tempBk.getiCount() + bk.getiCount());
+                return;
+            }
+        }
+        this.liLib.add(bk);
+    }
+
+    public boolean del(Book bk) {
+        Book tempBk;
+        for (int i = 0; i < this.liLib.size(); i++) {
+            tempBk = this.liLib.get(i);
+            if (tempBk.getStrIsbn().equals(bk.getStrIsbn())) {
+                if (tempBk.getiCount() > bk.getiCount()) {
+                    tempBk.setiCount(tempBk.getiCount() - bk.getiCount());
+                    return true;
+                } else if (tempBk.getiCount() == bk.getiCount()) {
+                    this.liLib.remove(i);
+                    return true;
+                }
+            }
+        }
+        return false;
+    }
+}

library/Student.java

@@ -0,0 +1,41 @@
+package library;
+
+public class Student {
+    private int iId;
+    private String strName;
+    private Bag bg;
+
+    public Student(int inId, String inName) {
+        this.iId = inId;
+        this.strName = inName;
+        this.bg = new Bag();
+    }
+
+    public void addBook(Book bk) {
+        this.bg.add(bk);
+    }
+
+    public int getiId() {
+        return iId;
+    }
+
+    public void setiId(int iId) {
+        this.iId = iId;
+    }
+
+    public String getStrName() {
+        return strName;
+    }
+
+    public void setStrName(String strName) {
+        this.strName = strName;
+    }
+
+    public Bag getBg() {
+        return bg;
+    }
+
+    public void setBg(Bag bg) {
+        this.bg = bg;
+    }
+}

library/Test.java

@@ -0,0 +1,15 @@
+package library;
+
+public class Test {
+    public static void main(String[] args) {
+        Administrator adm = new Administrator(1, "John");
+        adm.getLib().add(new Book("123", "Book1", 1));
+        adm.getLib().add(new Book("124", "Book2", 1));
+        adm.getLib().add(new Book("125", "Book3", 1));
+        Student st = new Student(1, "Alice");
+        st.getBg().add(new Book("123", "Book1", 1));
+        st.getBg().add(new Book("124", "Book2", 1));
+        st.getBg().add(new Book("125", "Book3", 1));
+        adm.register(st);
+    }
+}