Juzt Java

[juztjava-blog]

StringUtils examples

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…

StringUtils examples was originally published on

[juztjava-blog]

Java Basics Quiz

Related Post Membership Catalog Java Date Calculations scala trait and abstract class When only to prefer LinkedList over ArrayList

Java Basics Quiz was originally published on

[juztjava-blog]

HBase String.getBytes or Bytes.toBytes

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.…

HBase String.getBytes or Bytes.toBytes was originally published on

[juztjava-blog]

How to setup eclipse mars using installer

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…

How to setup eclipse mars using installer was originally published on

[juztjava-blog]

Big Data Quiz

  Related Post When only to prefer LinkedList over ArrayList Java Current Date Format what is the meaning of System.out.println Art of Unlearning

Big Data Quiz was originally published on

[juztjava-blog]

final, finally & finalize in Java

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…

final, finally & finalize in Java was originally published on

[juztjava-blog]

OCJP Online Test Series 4

Related Post LP Profile HBase Common Commands what is the meaning of System.out.println Java Collections Framework

OCJP Online Test Series 4 was originally published on

[juztjava-blog]

How to Install Open JDK 7 in Ubuntu

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…

How to Install Open JDK 7 in Ubuntu was originally published on

[juztjava-blog]

Java Null and empty string

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…

Java Null and empty string was originally published on

[juztjava-blog]

HDFS Interview Tips

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…

HDFS Interview Tips was originally published on

[juztjava-blog]

OCJP Practice Test - Series 3

        Related Post Spark Vs Hadoop – Comparison Lambdas in Java8 Post your Java Questions here Step by Step Guide on Setting up Scala IDE Eclipse

OCJP Practice Test – Series 3 was originally published on

[juztjava-blog]

Step by Step Guide on Setting up Scala IDE Eclipse

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”…

Step by Step Guide on Setting up Scala IDE Eclipse was originally published on

[juztjava-blog]

Java Basic File Operations

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…

Java Basic File Operations was originally published on

[juztjava-blog]

JDK JVM JRE

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…

JDK JVM JRE was originally published on

[juztjava-blog]

Java Overloading Overriding

  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…

Java Overloading Overriding was originally published on

[juztjava-blog]

Java Keyword and Reserved words

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 Keyword and Reserved words was originally published on

[juztjava-blog]

Java Queue Stack

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…

Java Queue Stack was originally published on