Computer Peripherals & Interfaces (CPI) Notes

Click here to download it

Computer Peripherals & Interfaces (CPI) Notes from Gurpreet singh

Computer Graphics Notes

Click here to download it

Computer Graphics Notes from Gurpreet singh

Remove all hyperlinks from a word file

1. To remove a single hyperlink without losing the display text or image, right-click the hyperlink, and then click Remove Hyperlink. To remove all hyperlinks in a document, press CTRL+A to select the entire document and then press CTRL+SHIFT+F9.

Learn Java Part 11

Java ppt11 from Gurpreet singh

Get Current Date in java

To get current date in java write following code:

            DateFormat dateFormat=new SimpleDateFormat("dd/MM/yyyy HH:mm:ss");
            Date date=new Date(); //get current date and time
            System.out.println(""+dateFormat.format(date));


Import statements:

import java.text.*;

for each loop in java

What is for each loop?
for each loop in java is the enhanced version of for loop. It is introduced from JDK 5. It is used to iterate all elements of an array or Collection.

---

Syntax:

for ( data-type variableName :  array or collection )
{
    //statements
}

---

Consider the following program:

public class ForEachLoop
{
    public static void main(String[] args)
    {
        int[] array ={ 1, 2, 3, 4, 5 };
        System.out.println("Array elements: ");

        for(int element: array)
               System.out.print(element+"  ");

    }
}

Write the above program in Notepad and save it as ForEachLoop.java 
Compile and run it to get the following output:

Array elements: 
1  2  3  4  5

the loop for(int element: array)
fetches the elements of array and assign it to variable element so we can use element to access the elements of array

Consider the following program to access elements of multi-dimensional array

public class ForEachLoop
{
    public static void main(String[] args)
    {
     int[][] array ={ {1, 2, 3, 4,},{ 5,6,7,8} }; //array with 2 rows and 4 columns
        System.out.println("Array elements: ");
        for(int[] row: array)
            for(int element: row)
               System.out.print(element+"  ");
    }
}

Write the above program in Notepad and save it as ForEachLoop.java 
Compile and run it to get the following output:

Array elements: 
1  2  3  4  5  6  7  8

the loop for(int[ ] row: array)
fetches one row of array and assign it to variable row so we can use row to access one row(or one dimensional array) of array

the loop for(int element: row)
fetches the elements of row and assign it to variable element so we can use element to access the elements of row

Command Line Arguments

public class CommandLineArguments
{
    public static void main(String[] args)
    {
        System.out.println("Total number of Command Line Arguments: "+args.length);
        System.out.println("Command Line Arguments:");
        for(int i=0;i<args.length;i++)
            System.out.println(args[i]);
    }
}

Type the above program in Notepad and Save it as CommandLineArguments.java
Compile like this:

javac  CommandLineArguments.java

Run like this:

java  CommandLineArguments   Arguments

For example: 

---

java  CommandLineArguments   Hello World
output:

Total number of Command Line Arguments: 2
Command Line Arguments:
Hello
World

---

If you run like this:
java  CommandLineArguments
output:

Total number of Command Line Arguments: 0
Command Line Arguments:

---

Note: Each argument in command line arguments is seperated by a space

Learn Java Part 10

Click here to download it

Learn Java Part 10 from Gurpreet singh

Learn Java Part 9

Click here to download it

Learn Java Part 9 from Gurpreet singh

Learn Java Part 8

Click here to download it

Learn Java Part 8 from Gurpreet singh