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Java-Strings

June 07, 2017

Java - Strings Class Strings, which are widely used in Java programming, are a sequence of characters. In Java programming language, strings are treated as objects. The Java platform provides the String class to create and manipulate strings. Creating Strings The most direct way to create a string is to write − String greeting = "Hello world!"; Whenever it encounters a string literal in your code, the compiler creates a String object with its value in this case, "Hello world!'. As with any other object, you can create String objects by using the new keyword and a constructor. The String class has 11 constructors that allow you to provide the initial value of the string using different sources, such as an array of characters. Example public class StringDemo { public static void main(String args[]) { char[] helloArray = { 'h', 'e', 'l', 'l', 'o', '.' }; String helloString = new Stri

Java-arrays

June 01, 2017

Java - Arrays Java provides a data structure, the array , which stores a fixed-size sequential collection of elements of the same type. An array is used to store a collection of data, but it is often more useful to think of an array as a collection of variables of the same type. Instead of declaring individual variables, such as number0, number1, ..., and number99, you declare one array variable such as numbers and use numbers[0], numbers[1], and ..., numbers[99] to represent individual variables. This tutorial introduces how to declare array variables, create arrays, and process arrays using indexed variables. Declaring Array Variables To use an array in a program, you must declare a variable to reference the array, and you must specify the type of array the variable can reference. Here is the syntax for declaring an array variable − Syntax dataType[] arrayRefVar; // preferred way. or dataType arrayRefVar[]; // works but not preferred way. Note − The style

May 12, 2017

Introduction to Data Structures and Algorithms Before introducing data structures we should understand that computers do store, retrieve, and process a large amount of data. If the data is stored in well organized way on storage media and in computer's memory then it can be accessed quickly for processing that further reduces the latency and the user is provided fast response. Data structure introduction refers to a scheme for organizing data, or in other words a data structure is an arrangement of data in computer's memory in such a way that it could make the data quickly available to the processor for required calculations. A data structure should be seen as a logical concept that must address two fundamental concerns. First, how the data will be stored, and second, what operations will be performed on it? As data structure is a scheme for data organization so the functional definition of a data structure should be independent of its implementation. The functional defin

Data Structures

May 04, 2017

Introduction to Data Structures Data Structure is a way of collecting and organising data in such a way that we can perform operations on these data in an effective way. Data Structures is about rendering data elements in terms of some relationship, for better organization and storage. For example, we have data player's name "Virat" and age 26. Here "Virat" is of String data type and 26 is of integer data type. We can organize this data as a record like Player record. Now we can collect and store player's records in a file or database as a data structure. For example: "Dhoni" 30, "Gambhir" 31, "Sehwag" 33 In simple language, Data Structures are structures programmed to store ordered data, so that various operations can be performed on it easily. Basic types of Data Structures As we discussed above, anything that can store data can be called as a data strucure, hence Integer, Float, Boolean, Char etc, all are d

Java - Decision Making

August 31, 2016

Java - Decision Making Decision making structures have one or more conditions to be evaluated or tested by the program, along with a statement or statements that are to be executed if the condition is determined to be true, and optionally, other statements to be executed if the condition is determined to be false. Following is the general form of a typical decision making structure found in most of the programming languages − Java programming language provides following types of decision making statements. Click the following links to check their detail. Sr.No. Statement & Description 1 if statement An if statement consists of a boolean expression followed by one or more statements. 2 if...else statement An if statement can be followed by an optional else statement , which executes when the boolean expression is false. 3 nested if statement You can use one if or else if statement inside another if or else if statement(s). 4 switch statement A

Java loop control

August 15, 2016

Java - Loop Control There may be a situation when you need to execute a block of code several number of times. In general, statements are executed sequentially: The first statement in a function is executed first, followed by the second, and so on. Programming languages provide various control structures that allow for more complicated execution paths. A loop statement allows us to execute a statement or group of statements multiple times and following is the general form of a loop statement in most of the programming languages − Java programming language provides the following types of loop to handle looping requirements. Click the following links to check their detail. Sr.No. Loop & Description 1 while loop Repeats a statement or group of statements while a given condition is true. It tests the condition before executing the loop body. 2 for loop Execute a sequence of statements multiple times and abbreviates the code that manages the loop variable. 3

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