我得到了这个类似商店的应用程序(Rails 3.2 + Postgresql),其中我的两个资源/表是User和Operation。
在其他属性中,User在每个时刻都有一个特定的:credit。
Operations代表以下任一种:
1. A purchase of a **product** (whose price is deduced from the `User`'s credit who purchased it).
2. A purchase of **credit** ( the amount of which is added to the `User
数据未显示在system.out.println语句中
带括号的它是工作的并且是equals方法
final String s1="all men are created equal:27";
final String s2="all men are created equal:"+s1.length();
System.out.println("all men are created equal:" + (s1==s2));
输出:人人生而平等:false
final String s1="all men are created equ