Java 泛型（泛型接口）

范例1：接口设置泛型，子类也设置泛型

interface MyMessage<T> {
	public void print(T t);
}

class Message<T> implements MyMessage<T> {
	@Override
	public void print(T t) {
		System.out.println(t);
	}
}

public class Demo {
	public static void main(String[] args) {
		MyMessage<String> msg = new Message<>();
		msg.print("Hello!");
	}

}

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范例2：子类不设置泛型吗，为父类接口定义明确泛型标记

interface MyMessage<T> {
	public void print(T t);
}

class Message implements MyMessage<String> {
	@Override
	public void print(String t) {
		System.out.println(t);
	}
}

public class Demo {
	public static void main(String[] args) {
		MyMessage<String> msg = new Message();
		msg.print("World!");
	}

}