Cannot Find Symbol

[Arthur Blair]

I have a "Cannot Find Symbol" compiler error that I am having difficulty resolving.

The compiler says:

Compiling 1 source file to C:\JavaApplication\build\classes
C:\JavaApplication\src\collections\TestArrays2.java:23: cannot find symbol
symbol  : method fill(boolean[],collections.Arrays2.RandomBooleanGenerator)
location: class collections.Arrays2
        Arrays2.fill(a1, new Arrays2.RandomBooleanGenerator());

In TestArrays2.java I have:

  
boolean[] a1= new boolean[size];
Arrays2.fill(a1, new Arrays2.RandomBooleanGenerator()); // compiler error is here
System.out.println("a1 = " + Arrays2.toString(a1));

In Arrays2.java I have:

  
 
public class Arrays2 {
 
// some other methods
 
   public static void fill(Object[] a, int from, int to, BooleanGenerator gen) {
        for(int i=0; i < to; i++)
            a[i] = gen.next();
   }
 
   // inner class
   public static class RandomBooleanGenerator implements BooleanGenerator {
        public boolean next() { return r.nextBoolean (); }
   }
}
 
// interface in the same source file
interface BooleanGenerator { boolean next(); }
 

Can someone point me in the right direction?

Thoughts appreciated.

[Joanne Neal]

Your Arrays2.fill method expects an Object array, two ints and a BooleanGenerator to be passed to it. You're only passing an array and BooleanGenerator.

Also, if you're not using Java 1.5, you cannot pass an array of boolean primitives to a method that is expecting an array of Objects. I think autoboxing in java 1.5 will handle this.

[Arthur Blair]

Thanks for the reply, J.

Sorry, I forgot to include in my previous code listing. Array2.java includes this method which calls the overloaded fill() method.

  
    // Fill an array using a generator:
    public static void fill(Object[] a, Generator gen) {
        fill(a, 0, a.length, gen);
    }

...I'm using Java 1.5.0_03. So I should be able to pass a boolean array to this fill method right?

[Ernest Friedman-Hill]

No, a boolean array is not an Object array, and won't be autoboxed. You'd have to pass an array of java.lang.Boolean, or implement another version that accepted a boolean[] .

[Arthur Blair]

Thanks Ernest.

I fixed the problem my making the methods in Array2.java receive specific Wrapper class arrays instead of Object arrays.