Binomial coefficient using generic Typ
With generic typ List With generic typ Array
read a file into List
There are many ways to read file into a List in Java. commons-io guava Java 7.0
platform independent separators in java
line separator (Windows: “\r\n”, UNIX: “\n”) 1. BufferedWriter newline() 2. System.lineSeparator() 3. System.getProperty(“line.separator”) file separator file.separator（windows:”\”; unix:”/”) 1. BufferedWriter newline() 2. System.getProperty(“file.separator”) 3. File.pathSeparator Annotation: In Windows: “D:\codehamster”, you can change it to “D:/codehamster” or “D:\\codehamster”
the useful subclass for BitSet and FastBitSet
BitSet and FastBit will always change themselves if they do some set operations, just like and, or, andNot. To avoid such cases, you should write a extended classes: For BitSet: MyBitSet For FastBitSet: MyFastBitSet
Example for Javolution FastBitSet
Javolution is a High-performence java library, it is not only fast but also very comfortable to use. FastBitSet of Javolution is similar to BitSet of Java native Bib. But there are still some differences in usage: 1. BitSet is cloneable,…