在spring boot 中有一段代码，使用的是java 1.8的语法：

    @Bean

    public CommandLineRunner commandLineRunner(ApplicationContext ctx) {

        return args -> {

            System.out.println("Let's inspect the beans provided by Spring Boot:");

            String[] beanNames = ctx.getBeanDefinitionNames();

            Arrays.sort(beanNames);

            for (String beanName : beanNames) {

                System.out.println(beanName);

            }

        };

    }

在java 1.7下要如何使用呢？

    @Bean

    public CommandLineRunner commandLineRunner(final ApplicationContext ctx) {

        return new CommandLineRunner() {

            public void run(String[] args) {

                System.out.println("Let's inspect the beans provided by Spring Boot:");

                String[] beanNames = ctx.getBeanDefinitionNames();

                Arrays.sort(beanNames);

                for (String beanName : beanNames) {

                    System.out.println(beanName);

                }

            }

        };

    }