public class Container
{
	int size;			// Container size (10, 20, 40)
	int weight;			// Weight in tons (0-40)
	String id;			// One character String in our test data; longer in general
	Container right;	// Next container in crane line
	Container down;		// Next container of same size, in arrival order
	
	public Container(int s, int w, String id){
		size= s;
		weight= w;
		this.id= id;
		right = down = null;
	}
}