refactor

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;
+    }
+}