如何合并具有可空字段的类的两个对象，并保留非空值？

public class MergeObjects {
    public static void main(String[] args) {
        // 创建两个对象
        MyClass obj1 = new MyClass();
        obj1.setId(1);
        obj1.setName("John");
        obj1.setAge(25);

        MyClass obj2 = new MyClass();
        obj2.setName("Doe");
        obj2.setAddress("123 Main St");

        // 合并对象
        MyClass mergedObj = merge(obj1, obj2);

        // 打印合并后的结果
        System.out.println("Merged Object: " + mergedObj);
    }

    public static MyClass merge(MyClass obj1, MyClass obj2) {
        MyClass mergedObj = new MyClass();

        // 遍历属性
        if (obj1.getId() != null) {
            mergedObj.setId(obj1.getId());
        } else {
            mergedObj.setId(obj2.getId());
        }

        if (obj1.getName() != null) {
            mergedObj.setName(obj1.getName());
        } else {
            mergedObj.setName(obj2.getName());
        }

        if (obj1.getAge() != null) {
            mergedObj.setAge(obj1.getAge());
        } else {
            mergedObj.setAge(obj2.getAge());
        }

        if (obj1.getAddress() != null) {
            mergedObj.setAddress(obj1.getAddress());
        } else {
            mergedObj.setAddress(obj2.getAddress());
        }

        return mergedObj;
    }
}

class MyClass {
    private Integer id;
    private String name;
    private Integer age;
    private String address;

    // 省略构造函数和getter/setter方法

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