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We may use String manipulations in most occasions, be it replace, concat. There is a utility class which includes most of the String operations and manipulations in commons-lang library. StringUtils Download StringUtils class comes as part of apache commons-lang library. Before using, this please include the jar in your classpath. You can download this from…

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We normally come across the question on whether to use String.getBytes of Bytes.toBytes, while converting the existing String values to Bytes, as HBase stores all information in Bytes format. There is a difference between them. Bytes.toBytes() converts the parameter to a byte[] using UTF-8. String.getBytes() converts the String to byte[] using the OS default encoding.…

The following post illustrates on how to setup the latest eclipse mars using the installer setup in Ubuntu. Before setting up, make sure that you have installed JDK or JRE in your local environment. Go to the eclipse downloads main page https://eclipse.org/downloads/ Select the Installer option, by selecting the OS and no of bit. It…

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Final final keyword can be applied to variables,method,class. Final Class: When a class is marked final, it cannot be subclassed. Final Method : When a method is marked final, it cannot be overridden by the subclass. Final Field: And when a field is marked final, its value once set, cannot be reset. Finalize finalize is…

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Installation of open jdk 7 is very simple in Ubuntu Take the terminal Enter the command sudo apt-get install openjdk-7-jdk When prompted enter the system password. Wait, till the installation completes. You can cross check by entering the following command java -version which will display OpenJDK Runtime Environment (IcedTea 2.6.3) (7u91-2.6.3-0ubuntu0.14.04.1) OpenJDK Server VM (build…

Null has no bounds, it can be used for string, integer, date, etc. fields. Empty string is just regarding a string; it’s a string like “abcd” is, but is just has no length. If you have no value for a field, use null, not an empty string. Null is an absence of a value. An…

HDFS runs in user space, as contrasted to the other filesystems HDFS has a default block size of 64 MB. Default replication factor is 3 and this is specified in hdfs-site.xml, in property dfs.replication HDFS has a master/slave architecture DataNode(slave) is responsible for low-level operations including block creation, deletion, reads and writes. A NameNode(master) keeps…

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Step by Step Illustration for Setting up Scala IDE Assuming that you already have eclipse installed in your system, please follow the step by step with screen shots for setting up scala IDE within eclipse. 1. Go to Help > Install New Software Type in “scala” and select “Scala IDE for Eclipse”   Choose “Next”…

code snippet on basic file handling operations in Java Have created a file Object named directory which points to desktop and contains multiple files and folder inside it. File directory = new File(“/home/d3/Desktop”);  Display all files and directories inside a directory //display all files inside a directory         String[] fileList = directory.list();                 for (String name : fileList) {             System.out.println(name);         }   To check whether it is a directory…

JRE JRE is Java Run Time Environment. The java programming language adds the portability by converting the source code to byte code version which can be interpreted by the JRE and gets converted to the platform specific executable ones. Thus for different platforms one has corresponding implementation of JRE. But JRE has to meet the…

  Overriding – same method names with same arguments and same return types associated in a class and its subclass Overloading – same method name with different arguments, may or may not be same return type written in the same class itself. OVERLOADING:  Same function with different arguments ADDITION(int x,int y)                               ADDITION(int x ,int y,int…

Reserved word A reserved word is a special word reserved either by a programming language or by a program. These are called as reserved words because they cannot be used as variable namesThe programming language’s specification can also include reserved words that could be used in its future versions. For example, ‘const’ and ‘goto’ are…

Java provides a Stack class, which can be found within the java.util namespace. Within the same namespace you will find a Queue interface. All concrete Queue implementations can be located within the java.util.concurrent package. What is a Stack? Java’s Stack class extends the Vector class. A Stack represents a Collection of objects that are in…