w9-202401070104-张思渊

w9/HelpCommand.java

@@ -0,0 +1,33 @@
+package com.example.datacollect.command;
+
+import com.example.datacollect.model.Article;
+import com.example.datacollect.view.ConsoleView;
+import java.util.List;
+
+public class HelpCommand implements Command {
+    private final ConsoleView view;
+
+    public HelpCommand(ConsoleView view) {
+        this.view = view;
+    }
+
+    @Override
+    public String getName() {
+        return "help";
+    }
+
+    @Override
+    public void execute(String[] args, List<Article> articles) {
+        view.printInfo("Available Commands:");
+        view.printInfo("  crawl <url>    - Crawl articles from URL (alias: c)");
+        view.printInfo("  list           - List all crawled articles (alias: ls)");
+        view.printInfo("  history        - Show command history");
+        view.printInfo("  help           - Show this help message (alias: h)");
+        view.printInfo("  exit           - Exit the program (alias: q)");
+        view.printInfo("");
+        view.printInfo("Examples:");
+        view.printInfo("  crawl https://example.com");
+        view.printInfo("  c https://example.com");
+        view.printInfo("  ls");
+    }
+}