验证是否可以在不使用循环的情况下更新对象字段(Java)

Class<?> clazz = obj.getClass();

Field field = clazz.getDeclaredField("fieldName");

field.setAccessible(true);

field.set(obj, newValue);

import java.lang.reflect.Field;

public class ObjectFieldUpdater {
    public static void updateField(Object obj, String fieldName, Object newValue) throws NoSuchFieldException, IllegalAccessException {
        Class<?> clazz = obj.getClass();
        Field field = clazz.getDeclaredField(fieldName);
        field.setAccessible(true);
        field.set(obj, newValue);
    }

    public static void main(String[] args) {
        // 示例对象
        Person person = new Person("John", 25);

        try {
            // 更新字段值
            updateField(person, "age", 30);

            // 验证更新结果
            System.out.println(person);
        } catch (NoSuchFieldException | IllegalAccessException e) {
            e.printStackTrace();
        }
    }
}

class Person {
    private String name;
    private int age;

    public Person(String name, int age) {
        this.name = name;
        this.age = age;
    }

    @Override
    public String toString() {
        return "Person{" +
                "name='" + name + '\'' +
                ", age=" + age +
                '}';
    }
}