Today we will work on AWK command line
tool in Unix .This article helps you to have a basic understanding on how awk
works and some of the internal structure of awk.
Awk is a simple and elegant pattern
scanning and processing language. It is created in the late 70’s.the name was
composed from the initial letters of three original authors Alfred V. Aho,
Brian W. Kernighan, and Peter J. Weinberger. It is commonly used as...
Friday, February 5, 2010
Java Performance Tips
Today's tip is about performance in Java. Here are a few things to watch out for. It is the little things that matter in the long run, so please pay attention:
1. Loops. Do not use nested loops as much as you can, unless you have to. Nested loops are VERY expensive.
2. For constant length number of items, use arrays instead of ArrayList. Only use ArrayList if you have a variable number of elements.
3. If you are using ArrayList,...
Wednesday, February 3, 2010
Java Tips
1. We have a options for instance initializers which look like this ,
@SuppressWarnings("serial")
ArrayList simpleList=new ArrayList() {{
add("jagadesh");
add("proKarma");
add("software");
}};
You can initialize the arraylist while constructing it .
2. There is a faclilty in instanceOf keyword.this was implemented in such a way that there is no need to check for null ,
Consider
If(someObject != null && someObject...
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