定义泛型接口及其实现

主讲教师：王少华 QQ群：483773664

学习目标

1、泛型接口

2、实现泛型接口的三种情况

一、定义接口

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public interface Generator<T> {
    public T next();
}

二、实现这个接口

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public class FruitGenerator implements Generator<String> {
 
    private String[] fruits = new String[]{"Apple", "Banana", "Pear"};
 
    @Override
    public String next() {
        Random rand = new Random();
        return fruits[rand.nextInt(3)];
    }
}

三、调用

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public class Main {
 
    public static void main(String[] args) {
        FruitGenerator generator = new FruitGenerator();
        System.out.println(generator.next());
        System.out.println(generator.next());
        System.out.println(generator.next());
        System.out.println(generator.next());
    }
}

四、实现接口的三种情况

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public class FruitGenerator<T> implements Generator<T>{
 
    @Override
    public T next() {
        // TODO Auto-generated method stub
        return null;
    }
 
}
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public class FruitGenerator implements Generator<String>{
 
    @Override
    public String next() {
        // TODO Auto-generated method stub
        return null;
    }
 
}
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public class FruitGenerator implements Generator{
 
    @Override
    public Object next() {
        // TODO Auto-generated method stub
        return null;
    }
}

五、学习视频网址：

http://edu.51cto.com/course/course_id-6083.html