java/project/command/HelpCommand.java

package com.crawler.command;

import java.util.List;

public class HelpCommand extends BaseCommand {
    private List<Command> commands;

    public HelpCommand(List<Command> commands) {
        this.commands = commands;
    }

    @Override
    public String getName() {
        return "help";
    }

    @Override
    public String getDescription() {
        return "显示所有可用指令";
    }

    @Override
    public void execute() {
        System.out.println("可用指令:");
        System.out.println("---------");
        for (Command cmd : commands) {
            System.out.printf("%-8s : %s%n", cmd.getName(), cmd.getDescription());
        }
    }
}