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import org.spongepowered.api.Sponge;
import org.spongepowered.api.text.Text;
import org.spongepowered.api.command.spec.CommandSpec;

PluginContainer plugin = ...;

CommandSpec myCommandSpec = CommandSpec.builder()
    .description(Text.of("Hello World Command"))
    .permission("myplugin.command.helloworld")
    .executor(new HelloWorldCommand())
    .build();

Sponge.getCommandManager().register(plugin, myCommandSpec, "helloworld", "hello", "test");

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import org.spongepowered.api.command.CommandException;
import org.spongepowered.api.command.CommandResult;
import org.spongepowered.api.command.CommandSource;
import org.spongepowered.api.command.args.CommandContext;
import org.spongepowered.api.command.spec.CommandExecutor;

public class HelloWorldCommand implements CommandExecutor {

    @Override
    public CommandResult execute(CommandSource src, CommandContext args) throws CommandException {
        src.sendMessage(Text.of("Hello World!"));
        return CommandResult.success();
    }
}

Tip

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import org.spongepowered.api.entity.living.player.Player;
import org.spongepowered.api.command.source.CommandBlockSource;
import org.spongepowered.api.command.source.ConsoleSource;

if (src instanceof Player) {
    Player player = (Player) src;
    player.sendMessage(Text.of("Hello " + player.getName() + "!"));
}
else if(src instanceof ConsoleSource) {
    src.sendMessage(Text.of("Hello GLaDOS!"));
    // The Cake Is a Lie
}
else if(src instanceof CommandBlockSource) {
    src.sendMessage(Text.of("Hello Companion Cube!"));
    // <3
}

Note

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CommandResult result = CommandResult.builder()
    .affectedEntities(42)
    .successCount(1)
    .build();

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