basics for Java/J2ee
Algorithms for coding interviews! 1. Object oriented programming 2. Data Structures (String*, Arrays, HashMap*, etc..) 3. Stacks and Queues 4. Iterative algorithm 5. Recursive function 6. Binary search 7. Tree traversal* 8. Sorting algorithm 9. Dynamic programming* * marked as very important #programming #javaprogramming #techinterview #codinginterview #toptechinterview
Both JAR and WAR are created(Zipped) with Java JAR tool , both have different purposes. JAR – Java Archive this JAR file may be a standalone java application or a zipped source . this file contains classes , libraries , property files Command to create a JAR file : here i want to create JAR…
There are a few procedures are there to delete workspace from eclipse, even after deleting the workspace manually from folder still it shows the workspace listing in the eclipse . after deleting the workspace folder from the directory we have to remove the listing from the eclipse ! it’s simple .. please follow the below…
calculating latencies , for a program , query or an service / project ., after little research here i am deriving mechanism to calculate latencies, first iam considering database : here my aim is calculate execution time for a query. >before executing the query run ‘set timing on’ comamnd in sql command line >after this…
Following four ways are used to retrieve elements from collection object : Using for-each loop. Using Iterator Interface. Using ListIterator interface. Using Enumeration Interface. For-each loop : for-each loop is like for loop which repeatedly executes a group of statements,for each element of collection the format is for(variable:collection object) // for( String values: os) {…
Introduction : This framework was introduced in JAVA SE v 1.2 what is a collection object ? Using an object to store a group of other objects, it means that we can use a class object as an array. such an object is called ‘collection object’ or ‘container object’ . We are using collection object…
In this post I’m going to use the properties(java.util.properties) class in database conenction, package Oracle.connection; import java.sql.*; import java.util.Properties; /** * * @author kattavijay */ public class DBConnect_Properties { public static void main(String a[])throws Exception { String url="jdbc:oracle:thin:@localhost:1521"; String username="scott"; String passwd="tiger"; Properties prop=new Properties(); prop.put("user",username); prop.put("password",passwd);…
There are some types to connect with Database , here in this example I’m going to work with Oracle Database. I’m using type-4 driver to connect to the data base. there are some steps to follow : Step 1: know your database url , username ,password . and make sure that ojdbc14.jar file should be…
we are using property file to store some organized data, like database url and connection username etc., reading from this property file is easy and useful myproperties.properties // my properties file name it`s contain name=katta vijay age=24 email=mail@javamix.net Main.java // to read data from property file package javamixposts; import java.io.*; import java.util.*; /** * *…
this program simply explains how to read data from the MS wordfile(.DOC) line by line using Apache POI, what is Apache POI and what is the need i already explain in previous post, you can find that post here for executing this program we need to download Apache POI api and make jar files in…
