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我有一個類，它包含一個id，name和（如果需要的話）parent-id，它將這些轉換爲對象，然後將它們鏈接起來。建立鏈接目錄
如果你看看正確的結尾，你會看到我正在嘗試修復的時刻，文件夾對象知道他們是否有孩子和/或父母，但如果我在這裏運行mkDirs（），它只會工作爲兩個級別（根，子文件夾），但如果有多級（root/folder1/folder1）它不會工作。
任何想法如何解決這個問題？
package stable;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.HashMap;
import java.util.Map;
public class Loop {
public static void main(String[] args) {
int PID = 0;
int RepoID = 1;
Connection con = null;
String url = "jdbc:mysql://localhost/document_manager";
String user = "root";
String password = "Pa55w0rd";
try {
con = DriverManager.getConnection(url, user, password);
} catch (SQLException e) {
e.printStackTrace();
}
Map<Integer,Folder> data = new HashMap<Integer,Folder>();
while(PID < 50)
{
try {
Statement st = con.createStatement();
ResultSet result = st.executeQuery("SELECT name, category_id, parent_id FROM categories WHERE parent_id = '"+PID+"' AND repository_id = '"+RepoID+"'");
while (result.next())
{
String FolderName = result.getString ("name");
String FolderId = result.getString ("category_id");
String ParentId = result.getString ("parent_id");
int intFolderId = Integer.parseInt(FolderId);
int intParentId = Integer.parseInt(ParentId);
System.out.println(FolderId+" "+FolderName+" "+ParentId);
Folder newFolder = new Folder(FolderName, intFolderId, intParentId);
data.put(newFolder.getId(), newFolder);
}
} catch (SQLException ex) {
System.out.println(ex.getMessage());
}
PID++;
}
for(Folder folder : data.values()) {
int parentId = folder.getParentFolderId();
Folder parentFolder = data.get(parentId);
if(parentFolder != null)
parentFolder.addChildFolder(folder);
//Added
System.out.print("\n"+folder.getName());
if(parentFolder != null)
System.out.print(" IS INSIDE "+parentFolder.getName());
else
System.out.print(" HAS NO PARENT!");
}
}
}