non-static method toString() cannot be referenced from a static context

Question

Don\'t want any code, just want some sort of guidance. Would like to keep my academic integrity in tact ;)

I keep getting that annoying error. I need to call the toS

Answer 1

As error is already states, do not call instance method in static context.

Room is a class, not an object. toString is a instance method. So Room.toString() in this case compiler looks for a static method toString. But toString is an instance method so it is causing an issue.

Always remember instance methods are called with the object of the class, not with class itself.

Answer 2

You shouldn't try to call toString() on a Room class but rather on a Room object. In that method, loop through the array of rooms with a for loop and print the String returned by calling toString() for each Room object held in the array since this is what it looks like your method should do.

For example

System.out.println("All Foos held here include: ");

// using a "for-each" loop, assuming an array called fooArray that holds Foo objects
for (Foo foo: fooArray) {
   System.out.println(foo);
}

You will obviously have to change the types and variable names for your code.

Edit 2: although you will have to use a standard for loop, not a for-each loop, since you won't be looping through the entire array, but rather will quit when roomsRented count is reached.

System.out.println("All Foos held here include: ");

// using standard for loop, assuming an array called fooArray that holds Foo objects
for (int i = 0; i < someMaxNumber; i++) {
   System.out.println(fooArray[i]);
}

Answer 3

What you're probably doing is calling toString() on the class Room, not an instance of it. For example, instead of writing:

Room.toString()

write:

Room r = new Room()
r.toString()

Answer 4

Look at the following code, you can compile toString with a static variable without a new object, it just throw exception at run time

demo>cat Test.java 
class Water {
  public String toString() {return "whatever";}
}

public class Test { 
  static Water water;
  public static void main(String...args) {
    System.out.println(water.toString());
  }
}

demo>javac Test.java 
demo>java Test
Exception in thread "main" java.lang.NullPointerException
    at Test.main(Test.java:8)