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/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		List<Integer> list = new ArrayList<>();
		list.add(1);
		list.add(20);
		int[] resultado = new int[list.size()];
		list.toArray(resultado);
	}
}

Main.java:16: error: no suitable method found for toArray(int[])
		list.toArray(resultado);
		    ^
    method Collection.<T#1>toArray(T#1[]) is not applicable
      (inference variable T#1 has incompatible bounds
        equality constraints: int
        upper bounds: Object)
    method List.<T#2>toArray(T#2[]) is not applicable
      (inference variable T#2 has incompatible bounds
        equality constraints: int
        upper bounds: Object)
  where T#1,T#2 are type-variables:
    T#1 extends Object declared in method <T#1>toArray(T#1[])
    T#2 extends Object declared in method <T#2>toArray(T#2[])
Note: Some messages have been simplified; recompile with -Xdiags:verbose to get full output
1 error

Standard output is empty