Java Community | Help. Code. Learn.•11mo ago

Unable to get list of list.

For some reason its not letting me .get() any of the inner-most lists.

36 Replies

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𝓐pothiconOP•11mo ago

I tried taking away the List.of(0) in the test and putting a breakpoint and it showed that 'test' was indeed a list containing two lists but when I try to .get() either list it doesnt return a list

𝓐pothiconOP•11mo ago

not even this works

𝓐pothiconOP•11mo ago

doing the .get(0) directly instead of doing it like test.get(0) does get the list

𝓐pothiconOP•11mo ago

very strange

Unknown User•11mo ago

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𝓐pothiconOP•11mo ago

well i cant specify a specific type because there are several different types of objects in the list

Unknown User•11mo ago

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𝓐pothiconOP•11mo ago

I have a list of maps that each contain a list of lists list > map > list > list

Unknown User•11mo ago

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𝓐pothiconOP•11mo ago

whats difficult about it? only other thing i could think of was doing List<List<?>> instead of List<?> but that didnt solve it either (without the .get(0))

Unknown User•11mo ago

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𝓐pothiconOP•11mo ago

nope they both implement FeatureElement but they dont extend the same of anything

Unknown User•11mo ago

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𝓐pothiconOP•11mo ago

im not im putting a list of entitytype blocks and a number into the same list

Unknown User•11mo ago

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𝓐pothiconOP•11mo ago

so really the datastructure is more like list>map>block/list>list>entitytype/int/list>block bc ive never heard of a record before lol

Unknown User•11mo ago

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𝓐pothiconOP•11mo ago

never heard of that before

Unknown User•11mo ago

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𝓐pothiconOP•11mo ago

the number is how many of the block needs to be surrounding the position in order for the mob to spawn there so

List.of(EntityType.CHICKEN, List.of(Blocks.GRASS, Blocks.TALL_GRASS), 4)

List.of(EntityType.CHICKEN, List.of(Blocks.GRASS, Blocks.TALL_GRASS), 4)

means that there needs to be 4 grass or tall grass next to the position for the chicken to spawn

Unknown User•11mo ago

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𝓐pothiconOP•11mo ago

Unknown User•11mo ago

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𝓐pothiconOP•11mo ago

Unknown User•11mo ago

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𝓐pothiconOP•11mo ago

well the map still needs a list of 'SpawnGenerator" but yeah

Unknown User•11mo ago

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𝓐pothiconOP•11mo ago

how? I did list.of() and seperated them with commas lol

Unknown User•11mo ago

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𝓐pothiconOP•11mo ago

Map.of(Blocks.GRASS_BLOCK, List.of(
        new SpawnParameters(EntityType.SHEEP, List.of(Blocks.WHEAT), 1),
        new SpawnParameters(EntityType.CHICKEN, List.of(Blocks.GRASS, Blocks.TALL_GRASS), 4)
)),

Map.of(Blocks.GRASS_BLOCK, List.of(
        new SpawnParameters(EntityType.SHEEP, List.of(Blocks.WHEAT), 1),
        new SpawnParameters(EntityType.CHICKEN, List.of(Blocks.GRASS, Blocks.TALL_GRASS), 4)
)),

see this example there is a list containing two SpawnParameters records aka they are seperate elments However I now can't get that list of spawn parameters for some reason

𝓐pothiconOP•11mo ago

its saying this is a List<capture of ?>

List.of(
        new SpawnParameters(EntityType.SHEEP, List.of(Blocks.WHEAT), 1),
        new SpawnParameters(EntityType.CHICKEN, List.of(Blocks.GRASS, Blocks.TALL_GRASS), 4)
)

List.of(
        new SpawnParameters(EntityType.SHEEP, List.of(Blocks.WHEAT), 1),
        new SpawnParameters(EntityType.CHICKEN, List.of(Blocks.GRASS, Blocks.TALL_GRASS), 4)
)

instead of a List<SpawnParameters> (and I can try changing it to want a list<?> but then I cant do .get() on it)

Unknown User•11mo ago

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𝓐pothiconOP•11mo ago

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Unable to get list of list.