生命周期-@PostConstruct&@PreDestroy

使用JSR250的@PostConstruct&@PreDestroy实现初始化和销毁

public class Cat {

    public Cat() {

    }

    @PostConstruct
    public void init() {
        System.out.println("init");
    }

    @PreDestroy
    public void destroy() {
        System.out.println("destroy");
    }
}