What is Dofollow and Nofollow Links?

What is Dofollow link?

Dofollow is a default value of anchor tag(<a>) rel attribute. It is a link building technique. It is used for back linking purpose. Back linking means how many incoming links to your website. It helps to increase your Google page rank. It is also for optimizing search engine.

Example to make a dofollow link:-
In anchor tag no need to specify dofollow value of rel attribute. Default anchor tag is dofollow type.
<a href=”http://www.sampleexamples.com”>Sample Examples</a>

Importance of rel attribute of Anchor tag:-
rel attribute is used to specify relationship between linked document to current document.

<a rel="value">

What is Nofollow link?

It is a HTML anchor tag <a> rel attribute value. It tells to search engine that particular link should not follow by search engine index. When a link with nofollow then it's not impact on search engine index. Basically make nofollow link for paid links.
To make a nofollow link, essential to write nofollow value of rel attribute of HTML anchor tag.

Example to make a nofollow link
<a href="http://www.sampleexamples.com" rel="nofollow">Sample Examples</a>


Hope, you get difference between dofollow and nofollow links.

Exception Handling Program in Java - How to Handle Exception in Java

This is sample example for how to handle exception in Java Programming. Here we handle error occurs due to array index out of bound.
Here handle error of array size exceed. In this example "exception_demo.java", array size is 10. Means we can insert element into array from arr[0] to arr[9] position. But trying to insert element at arr[10]. So ArrayIndexOutOfBoundsException occurs.

Program Code

//This program illustrates the Exception in a program.
public class exception_demo
{
 public static void main(String args[])
 {
  int []arr=new int[10];
  try
  {
   arr[10]=40; // Error occurs because arr range from 0 to 9
  }
  catch(ArrayIndexOutOfBoundsException e)
  {  
   System.out.println("Error Caught:  Array index out of bounds");
   arr[9]=40;
  }
  System.out.println("Beyond the exception point");
  System.out.println("Last element of array = "+arr[9]);
 }
}

Output

What is ArrayIndexOutOfBoundsException?

It is one of unchecked exception. Such exceptions are not listed in the list. This is identified at runtime. This occurs when array index is beyond the bounds means array size lime exceed.

Hope, this java code helps to understand exception handling in Java.

Java File Handling Program - How to Handle File in Java

It is a java example to demonstrate how to handle any File using Java programming. In this program open a file and show the complete data of file as a output.

File Name - "FILE_MAIN.java"
Output of this program is as same as compiled program. It's open program file and print complete program copy as a output.


Program Code
//program output is program itself which compiled

import java.util.*;
import java.io.*;
public class FILE_MAIN
{  
 public static void main(String[] args) throws FileNotFoundException
 { 
  FileReader dataFile = new FileReader("FILE_MAIN.java");
  Scanner FileRead = new Scanner(dataFile);
  while (FileRead.hasNextLine())
  {
   String Line1 = FileRead.nextLine();
   System.out.println(Line1);
  }
  FileRead.close();
 }
}

Output
Save file name as "FILE_MAIN.java".

It is a example of File Handling. In this program output is same copy of program itself.

Hope, it's helpful to understanding Java file handling.

Difference Between C++ and Java - Java Advantages over C++

Hello guys, Today I am going to discuss "Difference Between C++ and Java - Java Advantages over C++". Previously discussed difference between C and C++.

Difference Between C++ and Java

	C++	Java
1.	Write once, compile anywhere	Write once, run anywhere / everywhere. Full support to Platform Independency.
2.	C++ supports operator overloading for almost all operators.	Not supported by Java ,the (+) and (+=) operators are automatically overloaded to concatenate strings, and to convert other types to string in the process.
3.	C++ supports complex pointer concept.	Java does not support pointers.
4.	An array in C++ is not bounds checked.	An array in Java is bounds checked, but with extra runtime cost.
5.	C++ full support to Multiple Inheritance concept.	Java not direct support to multiple inheritance but implements by using interface concept.
6.	Compatible with C source code.	Not compatible with previous language like c,c++.
7.	C++ does not support interface concept.	Java supports interface concept.
8.	Scope resolution operator supported by C++.	Not used in Java.
9.	Structure and Union used in C++.	Not used in Java.
10.	A class definition in C++ has a closing semicolon(;).	A class definition in Java looks similar to a class definition in C++, but there is no closing semicolon.
11.	C++ supports destructors concept.	Automatic garbage collection (can be triggered manually). Doesn't have the concept of Destructor.
12.	C++ supports templates concept.	Java does not support templates.
13.	C++ supports GOTO statement.	Not supported by Java.
14.	C++ is more complex than Java.	It is simpler than C++.
15.	C++ doesn't have automatic garbage collector.	In Java memory management through automatic garbage collector.

Hope, you like this post.