使用函数式接口Supplier来实例化接口默认方法,Supplier对于给定的泛型类型产生一个实例,不需要任何参数。
接口：DefaultMethodInterface
package com.ven.java8.defaultmethod.Inteface;
/**
* jva8接口默认方法
* @author xiaowen0623
*
*/
public interface DefaultMethodInterface {
/**
* 接口静态变量
*/
public static final String TYPE="JAVA8";
/**
* 接口静态变量
*/
public static final String ZW="JAVA WEB开发工程师";
/**
* 接口方法
*
* @param userName
*/
public void execute(String userName);
/**
* 默认方法
*
* @param userName
*/
default void learn(String userName) {
System.out.println(userName + "正在学习"+TYPE+"。。。。。。");
}
/**
* 默认的静态方法
*
* @param userName
* @return
*/
public static String learnStr(String userName) {
String result = userName + " " + "是一名"+ZW;
return result;
};
}
接口工厂：
package com.ven.java8.defaultmethod.Inteface;
import java.util.function.Supplier;
/**
* 接口工厂
* 使用Supplier供应接口产生一个给定泛型的对象
* @author xiaowen0623
*
*/
public interface DefaulableFactory {
/**
* 通过函数接口Defaulable的实例
* @param supplier
* @return
*/
static DefaultMethodInterface create(Supplier<DefaultMethodInterface> supplier){
return supplier.get();
};
}
Supplier接口源代码：
/*
* Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*/
package java.util.function;
/**
* Represents a supplier of results.
*
* <p>There is no requirement that a new or distinct result be returned each
* time the supplier is invoked.
*
* <p>This is a <a href="package-summary.html">functional interface</a>
* whose functional method is {@link #get()}.
*
* @param <T> the type of results supplied by this supplier
*
* @since 1.8
*/
@FunctionalInterface
public interface Supplier<T> {
/**
* Gets a result.
*
* @return a result
*/
T get();
}
测试：
package com.ven.java8.defaultmethod.Inteface.test;
import com.ven.java8.defaultmethod.Inteface.DefaulableFactory;
import com.ven.java8.defaultmethod.Inteface.DefaultMethodImpl;
import com.ven.java8.defaultmethod.Inteface.DefaultMethodInterface;
/**
* 测试接口默认方法
* @author xiaowen0623
*
*/
public class TestFactory {
public static void main(String[] args) {
//使用DefaultMethodImpl::new 使用java8新的方法引用方式
DefaultMethodInterface d = DefaulableFactory.create(DefaultMethodImpl::new);
d.execute("xiaowen");
}
}