Java Programing laungage

Core Java Tutorial

Introduction of Core Java

How To Install JDk and Set of Path

Syntax of java Program

Difference between Java and C/C++

Advantage and Disadvantage of Java

What is Java

Why Java is not Pure Object Oriented Language

Java has Following Features/Characteristics

Limitation of Java Language and Java Internet

Common Misconception about Java

Simple Program of Java

Integrated Development Environment in java

Compile and Run Java Program

Applet and Comments in Java

Tokens in Java

Keywords in Java

Identifier and Variables in Java

Literals/Constants

Data Type in Java

Assignments and Initialization in Java

Operators in Java

Rule of Precedence in Java

Operator on Integer and Separators in Java Programming

Java Control Flow of Statements

If and If-else Selection Statement

Nested If-else and If-else-If Selection Statement

switch case and conditional operator Selection Statement

for and while Loop

do..while and for each Loop

break and labeled break statement

continue and labeled continue statement

return Statement and exit() Method

Escape Sequence for Special Characters and Unicode Code

Constants and Block or Scope

Statement in Java

Conversions between Numeric Types in Java

Import Statement in Java

User Input in Java using Scanner Class

User Input in Java using Console Class

Array in Java

One Dimensional Array

Two Dimensional Array

Two Dimensional Array Program

Command Line Argument in Java

String args Types in Java

Uneven/Jagged array in java

Math Class Function and Constant

Math Class all Function used in a program

Enumerated Types in Java

Object Oriented Programming v/s Procedural Programming

Object Oriented Programming Concepts in Java

Introduction to Class,Object and Method in Java

Class Declaration in Java

Class & Objects in java

Encapsulation in Java

Modifiers/Visibility for a Class or Interrface or member of a Class

Polymorphism in Java

Runtime polymorphism (dynamic binding or method overriding)

Search in Array
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In java for searching an element in an array we have a predefined method in the java.util.Arrays class, which searches for the element by using the binary search technique. Its general syntax is given as :

static int binarySearch(type[] arr, valuetobesearched);

For searching the above method takes a sorted array of any data type and the value to be searched as parameters. This method will return an integer value, which will be index of the element if it exists in the array, otherwise, it will give a negative value at which the element can be stored.

Following code snippet will help you understand the concept better :


import java.util.Arrays;
Java Tutorialslass sort
{
public static void main(String args[])
{
  String[] arr=new String[]{"shashi", "employee", "r4r", "software", "engineer"};
  Arrays.sort(arr); 
  for(int i=0;i<arr.length;i++)
  {
   System.out.println(arr[i]);
   }
   int j=Arrays.binarySearch(arr,"r4r");
  System.out.println("The element is at"+j);
  System.out.println("The element is:"+arr[j]);
 }
}

In above program we have stored the value returned by the binarySearch() method in an integer variable i.e j and then we printed the index of the element and its value.

 

Command Line Arguments In Java

Every Java program has a main method in which a string of array i.e.,String[] args is passed as a parameter, and thus arguments can specified on the command line.i.e. at the runtime. Following code snippet describes how to pass command line arguments in java:


Java Tutorialslass Java Tutorialsmdparameters
{
   public static void main(String[] args)
    {
int num1, num2;
int sum;;
num1 = Integer.parseInt(args[0]);
num2 = Integer.parseInt(args[1]);
sum = num1 + num2;
System.out.println("You have passed command line arguments :"+args[0]+","+args[1]);
System.out.println("The sum of the numbers is given by :"+sum);
     }
}    

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