通过反射获取成员变量并使用

Student.java

package student.demo1; public class Student { public String name; private int age; public int getAge() { return age; } public void setAge(int age) { this.age = age; } @Override public String toString() { return "Student{" + "name='" + name + '\'' + ", age=" + age + '}'; } }

Test.java

package student.demo1; import java.lang.reflect.Constructor; import java.lang.reflect.Field; public class Test { public static void main(String[] args) throws Exception { Class clazz = Class.forName("student.demo1.Student");//获取字节码文件 Student stu = (Student) clazz.getConstructor().newInstance();//获取空参构造并实例化 Field field = clazz.getField("name");//获取公有变量 field.set(stu, "panda");//设置值 Field field1 = clazz.getDeclaredField("age"); field1.setAccessible(true);//设置暴力反射,允许访问私有变量 field1.set(stu, 10); System.out.println(stu); System.out.println(field.get(stu));//获取变量的值 } }