troubles with object validation and assigning values

Question

So In this piece of code I'm going to post I'm trying to make it so that say you enter a bucket size of 3, Sense you picked the bucket size of 3 its suppose to make the value of the bucket bee 300$. when calculated in the rental profit method. But i've tried to arrange this code in many different ways but I cannot fix this problem. Can someone please give me some tips on how I should be doing this?

public void SetBucketSize(int b)
   { 

       if (bucket >6 || bucket <0)
       {
         System.out.println("Enter valid Bucket Size(1-5)");
       }

          if (bucket == 1)
          {

             BucketSize = 100;

          }
          if (bucket == 2)
          {

            BucketSize = 200;
          }
          if (bucket == 3)
          {

            BucketSize = 300;;
          }
          if (bucket == 4)
          {

            BucketSize = 400;
          }
          if (bucket == 5)
          {
            BucketSize = 500;
          }

        BucketSize = b;    
   }

public int GetBucketSize()
          {
             return this.BucketSize;
          }



@Override
    public int RentalProfit()  
    {
      return (RentalRate * RentalDays + BucketSize); 

    }

Answer 1

public void SetBucketSize(int b) {
    if (b < 1 || b > 5) {
        System.out.println("Enter valid...");
        return;
    }
    BucketSize = b * 100;
}

Answer 2

SetBucketSize has a parameter named b , and does eventually execute BucketSize = b , but all the code before that is entirely wrong.

Guard condition allows values 0 to 6, but there is only if statements for value 1 to 5, so they don't cover 0 and 6 itself.

Also the code assigns to BucketSize , but that gets overridden by the final BucketSize = b , so in short, all the code is meaningless and does nothing.

I'm amazed that the code even compiles, because where does bucket even come from?