void foo(Integer bar) { }

public class Test {
    private static void someMethod(char c) throws Exception {
        throw new Exception("I don't think so, matey!");
    }
    private static void someMethod(int i) {
        System.out.println(i);
    }
    public static void main(String[] args) throws Exception {
        someMethod(100);
        someMethod('d');
    }
}

100
Exception in thread "main" java.lang.Exception: I don't think so, matey!
    at Test.someMethod(Test.java:4)
    at Test.main(Test.java:13)

class CharIntCast
{
    private static void someMethod(int i)
    {
    }

    public static void main(String[] args)
    {
        someMethod(100);
        someMethod('d');
    }
}

Compiled from "CharIntCast.java"
class CharIntCast extends java.lang.Object{
CharIntCast();
  Code:
   0:   aload_0
   1:   invokespecial	#1; //Method java/lang/Object."<init>":()V
   4:   return

private static void someMethod(int);
  Code:
   0:   return

public static void main(java.lang.String[]);
  Code:
   0:   bipush	100
   2:   invokestatic	#2; //Method someMethod:(I)V
   5:   bipush	100
   7:   invokestatic	#2; //Method someMethod:(I)V
   10:  return

}

char a = '5';
String a_s = String.valueOf(a);
int a_i = Integer.parseInt(a_s);
setBrightness(a_i)