CODEWITHSUNDEEP
javavariablesuser-input
Abhijit Singh
Abhijit Singh

Reputation: 31

How to declare variable as per user choice?

So, I was writing a Java program and made a method create that accepted Object datatype variable. Here is the brief look

class FILO
{
   ArrayList listFILO;
   public void create(Object input)
   {
      Class<? extends Object> type=input.getClass();
      if(type.isArray())
      {
        /*Problem starts here. I want to create an array with same datatype as
         input but I can't get my head around it.*/
       }
         //...
    }
}

Upvotes: 1

Views: 311

Answers (1)

markspace
markspace

Reputation: 11030

You could use reflection, using java.lang.reflect.Array.

Array.newInstance( input.getClass(), length );

But trying to use reflection like this is usually a bad idea. You want to require the user to enter the type you are asking for, and then check that the user has entered the correct type.

Upvotes: 1

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