---
title: seed
tags: content, MCEA, technology
---

# /seed：查詢世界種子碼

### 原始碼

public static void register(CommandDispatcher<CommandSource> p_241067_0_, boolean p_241067_1_) {
  p_241067_0_.register(Commands.literal("seed").requires((p_198673_1_) -> {
     return !p_241067_1_ || p_198673_1_.hasPermissionLevel(2);
  }).executes((p_198672_0_) -> {

        long i = p_198672_0_.getSource().getWorld().getSeed();

        ITextComponent itextcomponent = TextComponentUtils.wrapWithSquareBrackets(
            (new StringTextComponent(String.valueOf(i))).modifyStyle((p_211752_2_) -> {
                return p_211752_2_
                    .setFormatting(TextFormatting.GREEN)
                    .setClickEvent(
                        new ClickEvent(
                            ClickEvent.Action.COPY_TO_CLIPBOARD, 
                            String.valueOf(i)
                        )
                    )
                    .setHoverEvent(
                        new HoverEvent(
                            HoverEvent.Action.SHOW_TEXT, 
                            new TranslationTextComponent("chat.copy.click")
                        )
                    )
                    .setInsertion(String.valueOf(i))
                ; // object returned
            })
         );

         p_198672_0_.getSource().sendFeedback(new TranslationTextComponent("commands.seed.success", itextcomponent), false);
    }));
}

### 對原始碼進行解析

I = world's seed
S(I) = make the value of I to string

generate a text, its string is S(I), and is wrapped by square brackets, then setting:
    Formatting : color is GREEN
    Click Event : copy S(I) to clipboard
    Hover Event : show translation text : "chat.copy.click"
    Insetion : S(I)

send feedback: "seed.success" and the text we generated.

(!) be careful: every time called S(I) will run the function String.valueof(I)

### 效能問題
1. 過多的使用`String.valueof(I)`：累積3次O(N)
2. 呼叫`wrapWithSquareBrackets`函式，會複製整個物件`ITextComponent`