public class Article {
    private String title;
    private String url;
    private String author;        // 新增
    private String publishDate;   // 新增

    // 构造器、getter/setter 相应更新
}
import java.util.ArrayList;
import java.util.List;

public class HistoryCommand {
    private List<String> commandHistory = new ArrayList<>();

    public void addCommand(String cmd) {
        commandHistory.add(cmd);
    }

    public List<String> getCommandHistory() {
        return new ArrayList<>(commandHistory); // 返回副本，防止外部修改
    }

    public void printHistory() {
        for (int i = 0; i < commandHistory.size(); i++) {
            System.out.println((i+1) + ": " + commandHistory.get(i));
        }
    }
}