摘要： From the highly regardedElements of Java Styleto the pages ofJavaWorld(seeJava Tip 67), many well-meaning Java gurus encourage the use of the double-c... 阅读全文

摘要： Java supports multiple threads to be executed. This may cause two or more threads to access the same fields or objects. Synchronization is a process w... 阅读全文

摘要： Depending on the usage, there are several "correct" answers.Since java5 the best way to do it is to use an enum:public enum Foo { INSTANCE;}The Righ... 阅读全文