Java does not permit you to cast any type to boolean : boolean Operators « Operators « SCJP

1. SCJP
2. Operators
3. boolean Operators

public class MainClass {
  public static void main(String[] argv) {
    int i = 0;
    boolean b = true;
    if (i & b) {
      System.out.println("true");
    }
  }
}

The operator & is undefined for the argument type(s) int, boolean