Java Constructors, Java

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class Rextester {
       // Rextester = Car
		int wheelsCount;
		int numbersOfSeats;
		int windows;
		
	public Rextester(){
		wheelsCount = 4;
		numbersOfSeats = 4;
		}
	
	public Rextester(int number){
		numbersOfSeats = number;
	}
	//Constructor Overloading
	public Rextester(int a, int b){
		wheelsCount = a;
		numbersOfSeats = b;
	}
		//Copy Construction
	public Rextester(Rextester c){
		wheelsCount = c.wheelsCount;
		numbersOfSeats = c.numbersOfSeats;
	}
		public void start(){
			System.out.println("Car is starting");
		}

public static void main(String[] args) {
		
			Rextester c1 = new Rextester(1,7);  
			c1.windows = 6;
			System.out.println(c1.wheelsCount);
			System.out.println(c1.numbersOfSeats);
			System.out.println(c1.windows);	
		
			Rextester c2 = new Rextester(c1);
			System.out.println(c1.wheelsCount);
			System.out.println(c1.numbersOfSeats);
			
			/*	Car c1 = new Car();
			c1.wheelsCount = 4;
			c1.numbersOfSeats = 4;  
			c1.windows = 6;
			System.out.println(c1.wheelsCount);
			System.out.println(c1.numbersOfSeats);
			System.out.println(c1.windows);
			
			System.out.println("************************");
			
			Car c2 = new Car();
			c2.wheelsCount = 4;
			c2.numbersOfSeats = 4;  
			c2.windows = 8;
			System.out.println(c1.wheelsCount);
			System.out.println(c1.numbersOfSeats);
			System.out.println(c2.windows);   */

}

[ + ] Show input
Compilation time: 0.74 sec, absolute running time: 0.14 sec, cpu time: 0.08 sec, memory peak: 31 Mb, absolute service time: 0.89 sec