Java Programming Tips


Checking IMEI Number Using Java Programs

IMEI number (International Mobile Equipment Identity) is a unique number used to identify mobile phones. IMEI is used by mobile networks to uniquely identify a device and hence the IMEI number is used to block stolen devices. IMEI number is composed of 15 decimal digits including a check digit. The last digit in the IMEI […]

How to Calculate CRC32 Checksum in Java

Cyclic Redundancy Check (CRC) is an error detection technique commonly used to detect any changes to raw data. CRC checksum is a short fixed length data derived from a larger block of data. If there is a change in original raw data, the computed CRC checksum will differ from the CRC checksum received from the […]

How to Check Pronic Number in Java

A pronic number is a product of two consecutive integers. Pronic numbers can be expressed in the form n(n+1). For example, 6 is a pronic number since it is the product of two consecutive integers 2 and 3.  These numbers are also known as oblong numbers or heteromecic numbers. Following are the first 10 pronic […]

How to Write a MapReduce Program in Java

This tutorial provides a step by step tutorial on writing your first hadoop mapreduce program in java. This tutorial uses gradle build system for the mapreduce java project. This program requires a running hadoop installation. Quick Introduction to MapReduce MapReduce is a programming framework which enables processing of very large sets of data using a […]

Random Alphanumeric Generator in Java

The following Java example program generates a cryptographically secure random alphanumeric string. If cryptographic security is not a requirement, the SecureRandom class can be replaced with Random class for a much faster implementation. The following function can be used to generate random strings with a specified length. It is also possible to specify a subset […]