how to double items?

@Mr_maderator_UY
For loops are an integral part of programming, I suggest you become a little more acquainted with them

switch works I guess.

 

Is this code like:

Code:

ItemStack item = new ItemStack(blockBroken.getType(), 2);

@CraftCreeper6

 

@Mr_maderator_UY
Is this code like what?

 

@CraftCreeper6, sorry, I didn't explain.

this code:

Code:

 
                         ItemStack item = new ItemStack(blockBroken.getType(), 2);

Is the same like you for loop?

 

@Mr_maderator_UY
No that's not a for loop.

A for loop looks like this:

Code:

for (Item item : itemList)
{
    // code to execute for each item in itemList
}

If you wanted to apply that to your situation your itemList will be block.getDrops(yourPickaxeItemStack)
Item will be replaced with ItemStack
And for each item in the list, you'll create a new ItemStack, just like you usually do:

Code:

ItemStack item = new ItemStack(blockBroken.getType(), 2);

But instead of having 2 as the amount you would use item.amount * 2

 

@CraftCreeper6, how i remember, for loop seems like that:

Code:

for (initialization; condition; increment/decrement) {
   statement(s)
}

So, i didn't understand, why you in

put " :"
Can you show an example?
Edit:can i just give a sick touch for pickaxe and do not anything?

 

That is just one type of loop. You don't always have to follow that format.

Using a foreach loop, which is what I have been describing above is easier to understand for sure.

The code I posted above is a pretty good example of how to use a foreach loop in Java.

If you wanted to keep the code as is then yeah, just add a silk touch enchantment to the pickaxe.

 

@CraftCreeper6, silk touch didn't work. I find a lot of information of for each loops
It like that, but i don't know how can i do this

Code:

for (type var : array)
{
    statements using var;
}

but i don't know how can i do this. Can you show in one, item what i need to do?

 

@Mr_maderator_UY
That for loop is just a description of what kinds of information you need to put where. Lets go through it

Code:

for (type var : array)
{
    statements using var;
}

The first vital piece of information is 'for', this just dictates that this will be a for loop. You do not have to change this.

The next piece is 'type'. This is the data type of each element in your 'array' value. For you it will be ItemStack.

Then we have 'var', this is just a name for the ItemStack in the current iteration, its not important what you name it but stick to some kind of naming convention.

And lastly we have 'array'. This is a collection of ItemStacks that you can get with block.getDrops() like we discussed previously.

Put it all together and you get a for loop that iterates over block.getDrops() where each element in the list is an ItemStack.