通过反射来修改对象里面的值

主函数：

import java.lang.reflect.Field;

public class reflec {
    public static void main(String[] args) throws NoSuchMethodException, ClassNotFoundException, IllegalAccessException {
        TestClassEx t = new TestClassEx();
            for (Field f : t.getClass().getDeclaredFields()) {
                if(f.getName().equals("leijun")) {
                    f.setAccessible(true);
                    f.set(t, "indian MI fans");
                    System.out.println(f.getName()+":"+f.get(t));
                }
            }
    }
}

实体类：

class TestClassEx extends TestClass{
    public String leijun = "are you ok?";
}

运行结果：

leijun:indian MI fans

Process finished with exit code 0