Help- Slime Block behavior replication

You can recreate the behavior of a slime block with some code editing (that is, by copying code snippets from the vanilla slime block).
First of all, add these imports if they're missing:

import net.minecraft.world.World;
import net.minecraft.util.math.BlockPos;
import net.minecraft.entity.Entity;
import net.minecraft.entity.EntityLivingBase;

Now you can add this to determine how much fall damage you'll get upon landing:

public void onFallenUpon(World worldIn, BlockPos pos, Entity entityIn, float fallDistance)
    {
        if (entityIn.isSneaking())
        {
            super.onFallenUpon(worldIn, pos, entityIn, fallDistance);
        }
        else
        {
            entityIn.fall(fallDistance, 0.0F);
        }
    }

0.0F means no fall damage at all, 1.0F means same fall damage as usual, 0.5F cuts fall damage in half. The entity gets normal fall damage if sneaking. If you don't want to copy the "sneaking doesn't reduce fall damage" behavior, remove everything except for entityIn.fall(fallDistance, 0.0F); line inside the brackets.

This piece of code is used to make the entity slower when walking on the block:

@Override
		public void onEntityWalk(World worldIn, BlockPos pos, Entity entityIn)
		{
			entityIn.motionX *= 0.75D;
			entityIn.motionZ *= 0.75D;
			super.onEntityWalk(worldIn, pos, entityIn);
		}

In this case, the entity walks 25% slower. The numbers should be set to a value between 0.0F (the entity doesn't move) and 1.0F (the entity moves normally), and both should be the same value.

Finally, this piece of code recreates the "bouncy" effect:

public void onLanded(World worldIn, Entity entityIn)
    {
        if (entityIn.isSneaking())
        {
            super.onLanded(worldIn, entityIn);
        }
        else if (entityIn.motionY < 0.0D)
        {
            entityIn.motionY = -entityIn.motionY * 1.0D;

            if (!(entityIn instanceof EntityLivingBase))
            {
                entityIn.motionY *= 0.8D;
            }
        }
    }

The entity won't bounce if sneaking. If you don't want this behavior, remove everything from if (entityIn.isSneaking()) to else.
if (entityIn.motionY < 0.0D) determines the minimum speed required to bounce: make sure to set it to 0.0D or lower.
entityIn.motionY = -entityIn.motionY * 1.0D; determines how bouncy the block is. Set the number to a value between 0.0D (not bouncy) and 1.0D (as bouncy as a slime block).

Where do I put this code? I put it in Slime.java and it said error. I got rid of the original code, and also tried adding it to the code, but it doesn't work. If you could help I'd really appreciate it :)

Put it right after this~~

public static class BlockCustom extends Block {
        public BlockCustom() {
            super(Material.CIRCUITS);
            setUnlocalizedName("slimeblockblk");
            setSoundType(SoundType.SLIME);
            setHardness(0F);
            setResistance(0F);
            setLightLevel(0F);
            setLightOpacity(0);
            setCreativeTab(TabMoneyCraftBlocks.tab);
        }

As for~~

import net.minecraft.world.World;
import net.minecraft.util.math.BlockPos;
import net.minecraft.entity.Entity;
import net.minecraft.entity.EntityLivingBase;

Put these after~~

import net.minecraft.block.Block;

Which is located towards the top at the end of a list of similar imports,

I don't think this code makes it stick to other blocks the way slimeblock does. Am I wrong? I don't know

how do I make it work with my block

Nevermind

How would this work for 1.16.5? It seems to throw errors at entityIn.fall(), entityIn.motionY, and EntityLivingBase.