drop item naturally with a chance %

hi, im making a plugin that when a player destroy's IRON_ORE it haves X% chance that something else drops, i came this far but now im stuck becaus its throwing quite a bit of errors...

Code:

public void onBlockBreakEvent(BlockBreakEvent event){
    (BlockBreakEvent() == Material.IRON_ORE, 1);{
 
 
     
        double rand = Math.random();
        for (Entry<ItemStack, Float> e : map) {
            rand -= e.getValue();
            if (rand <= 0) {
                block.getWorld().dropItemNaturally(centerOfBlock, e.getKey());
                break;
            }
     
     
     
     
     
     
     
        Block block = event.getBlock();
        Location centerOfBlock = block.getLocation().add(0.5, 0.5, 0.5);
        block.getWorld().dropItemNaturally(centerOfBlock, block.getWorld().dropItemNaturally(centerOfBlock, new ItemStack(Material.COBBLESTONE, 2)));
        if (Math.random() < 0.1)
            block.getWorld().dropItemNaturally(centerOfBlock, new ItemStack(Material.BONE, 1));
        if (Math.random() < 0.4)
                block.getWorld().dropItemNaturally(centerOfBlock, new ItemStack(Material.IRON_ORE, 1));
        if (Math.random() < 0.4)
                block.getWorld().dropItemNaturally(centerOfBlock, new ItemStack(Material.STONE, 1));
        if (Math.random() < 0.1)
                block.getWorld().dropItemNaturally(centerOfBlock, new ItemStack(Material.DIRT, 1));
        

 

Stack-trace please!

 

It seems like you just merged my code with yours without understanding what it does, thus either remove my code or your's.
Moreover you should learn a bit more about Java's syntax as this line is completely invalid:

Code:

(BlockBreakEvent() == Material.IRON_ORE, 1);{

I guess you meant to write the following:

Code:

if (event.getBlock().getType() == Material.IRON_ORE) {

 

Sorry ill remove your code and try it myself a bit more

 

before you can call a material name you need to put getType(), otherwise, java doesnt recognize the type of material you are talking about.