Java only creates sub class instance
Code example to show that when a new instance is created, Java only creates instance for the sub class, and for the super class.
Java open url with URL and URLConnection
Java open url with URL and URLConnection.
Java child class also 'inherits' parent class private fields
Code example to show that Java child class also inherits
parent class private fields.
Java group list objects by attribute
How to group a list of objects by one of the object’s attribute, which is similar to SQL group by statement and having the same results.
Java base64 encode and decode example
Java base64 encode and decode example.
Java String concatenation performance concern
Java String concatenation performance concern.
ThreadPoolExecutor map method with multiple parameters
ThreadPoolExeuctor from concurrent.futures package in Python 3 is very useful for executing a task (function) with a set of data (parameter) concurrently and this post lists examples on how to pass MULTIPLE parameters to the task being executed.
Floating horizontal scrollbar
How to use a jquery plugin to implement floating horizontal scrollbar, which is especially useful for single page application where partial content of the page (i.g. table of data) are large and dynamically updated and you don’t want to make use of the browser scrollbar for scrolling the partial content.
Java POI excel merge cell and style
Quick code example on how to merge cells with POI and apply cell style to the merged cell.
Java lazy initialization singleton instance pattern
Java lazy initialization singleton instance pattern.