申明一个Dog的类，包括成员变量姓名和年龄，构造函数，在主类中实例化一个Dog的数组有3只狗，（xiaobai，1）（xiaohei，2）（xiaohua，2），配合for循环打印3只小狗的名字和年龄

以下是Java语言的示例代码：

public class Dog {
    private String name;
    private int age;

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

    public String getName() {
        return name;
    }

    public int getAge() {
        return age;
    }
}

public class Main {
    public static void main(String[] args) {
        Dog[] dogs = {new Dog("xiaobai", 1), new Dog("xiaohei", 2), new Dog("xiaohua", 2)};
        for (Dog dog : dogs) {
            System.out.println("Name: " + dog.getName() + ", Age: " + dog.getAge());
        }
    }
}

输出结果：

Name: xiaobai, Age: 1
Name: xiaohei, Age: 2
Name: xiaohua, Age: 2