ADD file via upload

Library.java

@@ -0,0 +1,29 @@
+package jinjieti1;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * 图书馆主馆类
+ */
+public class Library {
+    private String libraryId;       // 图书馆ID
+    private String name;            // 图书馆名称
+    private List<BranchLibrary> branches;  // 分馆列表
+
+    public Library(String libraryId, String name) {
+        this.libraryId = libraryId;
+        this.name = name;
+        this.branches = new ArrayList<>();
+    }
+
+    // 添加分馆
+    public void addBranch(BranchLibrary branch) {
+        if (!branches.contains(branch)) {
+            branches.add(branch);
+        }
+    }
+
+    // getter
+    public String getName() { return name; }
+}