Java 反射：两套实战：② 创建对象 + 打开开关

② 创建对象 + 打开开关

• import java.lang.reflect.Field;
• import java.lang.reflect.Method;
• import java.lang.reflect.Constructor;
• // 获取 Class 对象
• Class clazz = Car.class;
• // 创建 Car 对象
• Constructor c = clazz.getConstructor(String.class, int.class);
• Object car = c.newInstance(Toyota, 2020);
• // 取字段并打开访问开关
• Field modelField = clazz.getDeclaredField(model);
• Field yearField = clazz.getDeclaredField(year);
• modelField.setAccessible(true);
• yearField.setAccessible(true);

③ 读值 + 改值

• // 打印原始字段值
• System.out.println(Original Model: + modelField.get(car));
• System.out.println(Original Year: + yearField.get(car));
• // 修改字段值
• modelField.set(car, Honda);
• yearField.set(car, 2024);