import java.lang.Integer;
import java.lang.Double;
import java.lang.String;

public class Instanceof{
		void checkInstanceof() {
    		var a = 4;
    		return (a instanceof java.lang.Integer);
    	}

		void checkInstanceOfWithPattern(){
			var b = 4.0;
			if(b instanceof java.lang.Double d){
				return d;
			}else{
				return "Kein Double";
			}
		}
}