Boilerplate example

Car.java

import java.util.Arrays;

public class Car {

	private int maxSpeed;
	private Wheel[] wheels;

	public Car(int maxSpeed, Wheel[] wheels) {
		this.maxSpeed = maxSpeed;
		this.wheels = wheels;
	}

	public int getMaxSpeed() {
		return maxSpeed;
	}

	public void setMaxSpeed(int maxSpeed) {
		this.maxSpeed = maxSpeed;
	}

	public Wheel[] getWheels() {
		return wheels;
	}

	public void setWheels(Wheel[] wheels) {
		this.wheels = wheels;
	}

	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + maxSpeed;
		result = prime * result + Arrays.hashCode(wheels);
		return result;
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		Car other = (Car) obj;
		if (maxSpeed != other.maxSpeed)
			return false;
		if (!Arrays.equals(wheels, other.wheels))
			return false;
		return true;
	}

	@Override
	public String toString() {
		return "Car [maxSpeed=" + maxSpeed + ", wheels="
				+ Arrays.toString(wheels) + "]";
	}
}