摘要：
A New York City divorce lawyer died and came before St.peter. "What exactly have you done to earn eternal happiness?" St.Peter said. The lawyer recalled that he had given a bum on the street a quart... 阅读全文
摘要：
The news isn't good when a guy visits the doctor for his annual checkup. "You're got to do something to improve your health," the doctor says. "What?" the patient asks. "I recommend walking or joggi... 阅读全文
摘要：
String对象是不可改变的，每次使用String类中的方法时，都要在内存中创建一个新的字符串对象，这就需要为该新对象分配新的空间。在需要对字符串执行重复修改的情况下，与创建新的String对象相关的系统开销可能会非常昂贵。如果要修改字符串而不创建新的对象，则可使用StringBuilder类。 对于String类我就不想举例了，使用的很普遍。对于像我这样的初学者来说，StringBuilder... 阅读全文