Exercise18_1

Get now date and time easily by using Java s API:java.text.SimpleDateFormat and java.util.Calendar.

一个命题，是表达了对象之间关系的概念结构。命题必须符合以下规则：它必须是抽象的；它必须与一个真值关联；它必须符合一定的形式化规则。按照命题理论，(A proposition is to express the concept of the relationship between the object structure. Proposition must meet the following rules: it must be abstract it must be associated with a true value it must meet certain formal rules. In accordance with the proposition theory)

Tests regular expressions containing.

java的解压缩程序,希望大家批评指正,多发表意见(Java decompression procedures, hope everyone animadversion correct, much comment)

spring boot 工作流，采用spring boot的结构框架实现工作流的机制(Spring boot workflow, using spring boot structure framework to implement workflow mechanism)

说明：  设计模式一（单子、工厂、策略模式）练习 1． 假设现在要设计一个贩卖各类书籍的电子商务网站的购物车系统。对所有的教材类图书 实行每本一元的折扣；对连环画类图书提供每本7%的促销折扣；而对非教材类的计算机图书有3%的折扣；对其余书没有折扣。使用策略模式、工厂模式、单子模式进行设计(Design Mode 1 (List, Factory, Strategy Mode) Exercise 1. Suppose we are going to design a shopping cart system for e-commerce websites that sell all kinds of books. All textbook books are discounted at one yuan per book; comic books are discounted at 7% per book; computer books are discounted at 3% for non-textbook books; and other books are discounted at no rate. Design using strategy mode, factory mode and single mode)

可以播放音乐的音乐播放器，即使切入到后台也能继续运行。界面还需要加强(This one can display music,even though switch to invisible state,you can continue to use it.)

石油地震勘探数据处理模块（Java） 数据集合分选(Oil&Gas exploring - seismic data processing modules(java) data sorting part)

说明：  program source code for a lifestyle program

要将 MenuBar 加入一个Frame 中，应使用的方法是？ A. setMenu() B. setMenuBar() C. add() D. addMenuBar() 2. 使用哪一个布局管理器时，当Frame 的大小被改变时Frame 中的按钮的位置可能会被改 变? A. BorderLayout B. FlowLayout C. CardLayout D. GridLayout(To add a Frame MenuBar, the method should be using? A. setMenu () B. setMenuBar () C. add () D. addMenuBar () 2. When using a layout manager which, when Frame Frame size is changed in the position of the buttons may be changed? A. BorderLayout B. FlowLayout C. CardLayout D. GridLayout)