java - Set world border to 400 blocks -

i set world border 400 blocks when server starts, players can't go out of map far.

how can achieve this? can't find way myself.

to world, use bukkit.getworld(worldname). so, world "world" (the default world), use:

world world = bukkit.getworld("world");

worldborder border = world.getworldborder();

then, can modify world have side length of 400 blocks using:

border.setsize(400.0);

and set center location @ x = 0 , z = 0 using

border.setcenter(0.0, 0.0);

so, code in onenable() method in main class (the 1 extends javaplugin) this:

world world = bukkit.getworld("world");  worldborder border = world.getworldborder(); border.setsize(400.0); border.setcenter(0.0, 0.0);

if border 400 blocks in every direction, should set size 800.0 instead of 400.0.

Braziel