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public abstract class LandscapeTile {
	private static Random rnd = new Random();
	Vector2d coordinates;
	int elevation;
 
	public abstract int getMinElevation();
	public abstract int getMaxElevation();
 
	private LandscapeTile(Vector2d coordinates) {
		this.coordinates = coordinates;
		this.elevation = rnd.nextInt(getMinElevation(), getMaxElevation());
	}
 
	public static LandscapeTile hill(Vector2d coordinates) {
		return new Hill(coordinates);
	}
 
	public static LandscapeTile forest(Vector2d coordinates) {
		return new Forest(coordinates);
	}
 
	public static class Hill extends LandscapeTile {
 
		private Hill(Vector2d coordinates) {
			super(coordinates);
		}
 
		@Override
		public int getMinElevation() { 
			return 50;
		}
 
		public int getMaxElevation() {
			return 100;
		}
	}
 
	public static class Forest extends LandscapeTile {
 
		private Forest(Vector2d coordinates) {
			super(coordinates);
		}
 
		@Override
		public int getMinElevation() { 
			return 10;
		}
 
		public int getMaxElevation() {
			return 50;
		}
	}
 
 
	public static void main(String[] args) {
		List<LandscapeTile> tiles = Arrays.asList(
			LandscapeTile.hill(new Vector2d(0, 1)),
			LandscapeTile.forest(new Vector2d(1, 1))
		);
	}
}
 

Main.java:1: error: class LandscapeTile is public, should be declared in a file named LandscapeTile.java
public abstract class LandscapeTile {
                ^
Main.java:2: error: cannot find symbol
	private static Random rnd = new Random();
	               ^
  symbol:   class Random
  location: class LandscapeTile
Main.java:3: error: cannot find symbol
	Vector2d coordinates;
	^
  symbol:   class Vector2d
  location: class LandscapeTile
Main.java:9: error: cannot find symbol
	private LandscapeTile(Vector2d coordinates) {
	                      ^
  symbol:   class Vector2d
  location: class LandscapeTile
Main.java:14: error: cannot find symbol
	public static LandscapeTile hill(Vector2d coordinates) {
	                                 ^
  symbol:   class Vector2d
  location: class LandscapeTile
Main.java:18: error: cannot find symbol
	public static LandscapeTile forest(Vector2d coordinates) {
	                                   ^
  symbol:   class Vector2d
  location: class LandscapeTile
Main.java:24: error: cannot find symbol
		private Hill(Vector2d coordinates) {
		             ^
  symbol:   class Vector2d
  location: class Hill
Main.java:40: error: cannot find symbol
		private Forest(Vector2d coordinates) {
		               ^
  symbol:   class Vector2d
  location: class Forest
Main.java:2: error: cannot find symbol
	private static Random rnd = new Random();
	                                ^
  symbol:   class Random
  location: class LandscapeTile
Main.java:56: error: cannot find symbol
		List<LandscapeTile> tiles = Arrays.asList(
		^
  symbol:   class List
  location: class LandscapeTile
Main.java:57: error: cannot find symbol
			LandscapeTile.hill(new Vector2d(0, 1)),
			                       ^
  symbol:   class Vector2d
  location: class LandscapeTile
Main.java:58: error: cannot find symbol
			LandscapeTile.forest(new Vector2d(1, 1))
			                         ^
  symbol:   class Vector2d
  location: class LandscapeTile
Main.java:56: error: cannot find symbol
		List<LandscapeTile> tiles = Arrays.asList(
		                            ^
  symbol:   variable Arrays
  location: class LandscapeTile
13 errors

Standard output is empty