通过反射来创建对应运行时类的对象

public class TestNew {
	public static void main(String[] args) throws InstantiationException, IllegalAccessException, NoSuchMethodException, SecurityException, IllegalArgumentException, InvocationTargetException {
		Class<Person> clazz = Person.class;
		Person p1 = clazz.newInstance();
		Constructor<Person> cons = clazz.getConstructor(int.class, String.class);
		Person p2 = cons.newInstance(21, "cdf");
		System.out.println(p1);// Person [age=0, name=null]
		System.out.println(p2);// Person [age=21, name=cdf]
	}
}