Code:
ItemStack diamond = new ItemStack(Material.DIAMOND);
ShapedRecipe diamondRecipe = new ShapedRecipe(diamond);
diamondRecipe .shape("ABA","BCB","ABA");
diamondRecipe .setIngredient('A', Material.ENDER_PEARL);
diamondRecipe .setIngredient('B', Material.BLAZE_ROD);
diamondRecipe .setIngredient('C', Material.IRON_BLOCK);
getServer().addRecipe(diamondRecipe );
Ps. Lern java falls du mehr Fragen hast^^