Java: Static Variables, Static Methods and Static Constructor
Java's static variables are variables or fields that are common to all object of a class. Unlike instance variables, objects of the same class have their own distinct copies of the variables and values. In other words, a static variable is shared among objects of the same class. You can declare static variables (or static fields or class variables) by adding static modifier to the variables declaration.
Java: Randomly sort values in a array (the generic way) in single pass
Few years back (yes, about 4 years back), I wrote an article about randomly sort query results in MySQL. The main problem in randomly sort query results is that when you have a very large data in your database and the statement to sort the result may change the data execution plan causing DMBS does not choose the right plan. Therefore, sometime it is more wise to sort it in your own program instead of too depending on DBMS's decision which may affect the overall performance of a program.
Java: Format integer into number of decimal places and performance
For certain reasons (e.g. precision issue), some programmer may store a float value (e.g. money) in integer variable. For example -12345678.90 is stored as -1234567890. To convert the integer value to number with number of decimal places is a problem.
There are several way to do it. You can simply use the Java's String.format(), DecimalFormat or Float.toString(). Most of them does not meet my requirements: Simple, fast, precise and with thousand separator. Therefore I wrote a simple class that ease myself.
Java Static Constructor
Recently I wrote a Java class that maps ISO 3166-1-alpha-2 country code to country name and encountered a static constructor initialization problem. My code is as following:
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