javaI编写程序要求：1. 编写一个接口Animal，其成员变量有name，age，weight表示动物名、年龄和重量。声明方法showInfo( )、move( )和eat( )。 2. 编写一个类Bird实现Animal相应的方法。通过构造方法给name，age，weight分别赋值，showInfo( )打印鸟名、年龄和重量，move( )方法打印鸟的运动方式，eat( )打印鸟喜欢吃的食物。 3. 编写测试类TestAnimal，用Animal类型的变量，调用Bird对象的三个方法。

以下是 Java 代码实现：

Animal.java

public interface Animal {
    String name = "";
    int age = 0;
    double weight = 0.0;
    void showInfo();
    void move();
    void eat();
}

Bird.java

public class Bird implements Animal {
    private String name;
    private int age;
    private double weight;

    public Bird(String name, int age, double weight) {
        this.name = name;
        this.age = age;
        this.weight = weight;
    }

    @Override
    public void showInfo() {
        System.out.println("Bird name: " + this.name);
        System.out.println("Age: " + this.age);
        System.out.println("Weight: " + this.weight + " kg");
    }

    @Override
    public void move() {
        System.out.println("Fly");
    }

    @Override
    public void eat() {
        System.out.println("Insects");
    }
}

TestAnimal.java

public class TestAnimal {
    public static void main(String[] args) {
        Animal bird = new Bird("Sparrow", 1, 0.1);
        bird.showInfo();
        bird.move();
        bird.eat();
    }
}

输出结果：

Bird name: Sparrow
Age: 1
Weight: 0.1 kg
Fly
Insects