Graph Data Structure And Algorithms

A Graph is a non-linear data structure consisting of nodes and edges. The nodes are sometimes also referred to as vertices and the edges are lines or arcs that connect any two nodes in the graph. More formally a Graph can be defined as,A Graph consists of a finite set of vertices(or nodes) and set of Edges which connect a pair of nodes. In...

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Java Serialization and Customized Serialisation

Serialization Serialization is a mechanism of converting the state of an object into a byte stream. Deserialization is the reverse process where the byte stream is used to recreate the actual Java object in memory. This mechanism is used to persist the object. The byte stream created is platform independent. So, the object serialized...

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Java Innerclass

Inner class is a class defined inside other class and act like a member of the enclosing class. There are two main types of inner classes Static member class Inner class Member class Anonymous class Local class Static member class A static member class behaves much like an ordinary top-level class, except that it can access the static members of the outer.  Outer class can access all inner class fields by referring...

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JDBC Interview Questions

ACID Properties in DBMS? A transaction is a single logical unit of work which accesses and possibly modifies the contents of a database. Transactions access data using read and write operations.In order to maintain consistency in a database, before and after transaction, certain properties are followed. These are called ACID properties. Atomicity By this, we mean that either the entire transaction takes place at once or doesn’t...

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Hibernate Interview Questions

filter employees with same salary count greater than five (group by salary) using hibernate criteria? Session session = getCurrentSession(); ProjectionList projectionList = Projections.projectionList(); projectionList.add(Projections.groupProperty("totalCode")) .add(Projections.groupProperty("activityCode")) ...

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Java program to capitalize first letter of each word in string

public class FirstWordUpperCase { public static void main(String[] args) { System.out.println(changeString("how are you man")); } private static String changeString(String str) { StringBuffer sb = new StringBuffer(); String[] arr = str.split("\\s"); for (int i = 0; i < arr.length; i++) { sb.append(Character.toUpperCase(arr[i].charAt(0))). append(arr[i].substring(1)).append(" "); } return sb.toString(); ...

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JSP Interview Questions

How to disable caching on back button of the browser? <% response.setHeader(“Cache-Control”,”no-store”); response.setHeader(“Pragma”,”no-cache”); response.setHeader (“Expires”, “0”); //prevents caching at the proxy server %> ...

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