关于java异常处理的疑问

public class CircleWithException {
    private double radius;

    private static int numberOfObjects = 0;

    public CircleWithException() {
        this(1.0);
    }

    public CircleWithException(double newRadius) {
        setRadius(newRadius);
        ++numberOfObjects;
    }

    public double getRadius() {
        return radius;
    }

    public void setRadius(double newRadius) {
        if (newRadius >= 0)
            radius = newRadius;
        else
            throw new IllegalArgumentException("Radius cannot be negative");
    }

    public static int getNumberOfObjects() {
        return numberOfObjects;
    }

    public double findArea() {
        return radius * radius * 3.14159;
    }
}

public class TestCircleWithException {
    public static void main(String[] args) {
        try {
            CircleWithException c1 = new CircleWithException(5);
            CircleWithException c2 = new CircleWithException(0);
            CircleWithException c3 = new CircleWithException(-5);
        }
        catch (IllegalArgumentException ex) {
            ex.printStackTrace();
        }

        System.out.println("Number of objects created: " +
                CircleWithException.getNumberOfObjects());
    }
}

这是全部的代码，在运行多次的时候会有两种不同的情况
第一种是这样异常处理在后面打印出来

然后第二种情况是异常处理在前面打印，然后是代码中最后一句打印内容

很不能理解，Java中同样的代码为何能有两种不同的情况，希望有人可以解答一下，非常感谢

printStackTrace()会有阻塞