car.java

java2 primer plus一书源程序

public class Car
{
    private int gas=5;
    private boolean engineRunning=false;

    public boolean start() throws CarException
    {
        if( gas <= 0 )
        {
            CarException e = new CarException( "Out of gas!" );
            e.setGas( false );
	    throw e;
        }

        engineRunning=true;
        return engineRunning;
    }

    public static void main( String[] args )
    {
        Car c = new Car();
        try
        {
            c.start();
        }
        catch( CarException e )
        {
            e.printStackTrace();
        }
    }
}