The blockExists method in the World class from the Minecraft library checks whether a block exists at a specified x, y, and z coordinate. This method returns true if the block exists and false if it doesn't.
Example 1: Checking if a block exists at the player's location.
if (world.blockExists(playerPos.getX(), playerPos.getY(), playerPos.getZ())) { // do something }
Example 2: Checking if a block exists at a specific coordinate.
if (world.blockExists(0, 60, 0)) { // do something }
The package library for this method is net.minecraft.world.
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