IfWhen.java

public class IfWhen {
  
  public static boolean yesNoToBoolean(String s) {
    if ("yes".equals(s)) return true;
    else if ("no".equals(s)) return false;
    else throw new RuntimeException("Unsupported value: " + s);
  }

  public static void main(String[] args) {
    System.out.println(yesNoToBoolean("yes"));
  }
}