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import java.util.ArrayList;
 
public class Pool {
    private static Pool ourInstance = new Pool();
    private ArrayList pool= new ArrayList<Car>();
 
 
    public static Pool getInstance() {
        return ourInstance;
    }
 
    public void addToPool(Car obj){
        pool.add(obj);
    }
 
    public Car get(Class s) throws ClassNotFoundException {
 
 
        for(Object i:pool) {
            if(i instanceof s ){
				//вот тут ^ проблема 
            }
        }
        //Если нужног нет в пуле, создать, добавить вернуть
        return null; // нинужно
    }
 
    private Pool() {
    }
}
 

Main.java:3: error: class Pool is public, should be declared in a file named Pool.java
public class Pool {
       ^
Main.java:12: error: cannot find symbol
    public void addToPool(Car obj){
                          ^
  symbol:   class Car
  location: class Pool
Main.java:16: error: cannot find symbol
    public Car get(Class s) throws ClassNotFoundException {
           ^
  symbol:   class Car
  location: class Pool
Main.java:5: error: cannot find symbol
    private ArrayList pool= new ArrayList<Car>();
                                          ^
  symbol:   class Car
  location: class Pool
Main.java:20: error: cannot find symbol
            if(i instanceof s ){
                            ^
  symbol:   class s
  location: class Pool
5 errors

Standard output is empty