I think I've messed up the Strings/Boolean functions, but im not sure how to fix it. Any help would be appreciated.

public class Parks {
private String[] parkingBays;
private int numCars;

public Parks(int capacity) {
parkingBays = new String[numCars];

for (int i = 0; i <= parkingBays.length; i++) {
parkingBays[i] = "Empty";
}
}
public boolean park() {
String car;

if (numCars > parkingBays.length){
parkingBays[++numCars] = car;
}
else {
return false;
}
}

/**
* For Testing
*/
public static void main(String [] args) {
Parks p = new Parks(20);
boolean spaces = true;
while (spaces) {
spaces = p.park("car1");
spaces = p.park("car2");
}
for (String car : p.parkingBays)
System.out.println(car);
}
}