A program with examples of various Java syntax that converts a base 10 int to base 2 String

public class BinaryConverter {
    
    public static void main(String[] args){
        for(int i = -5; i < 33; i++){
            System.out.println(i + ": " + toBinary(i));
            System.out.println(i);
            //always another way
            System.out.println(i + ": " + Integer.toBinaryString(i));
        }
    }
    
    /*
     * pre: none
     * post: returns a String with base10Num in base 2
     */

    public static String toBinary(int base10Num){
        boolean isNeg = base10Num < 0;
        base10Num = Math.abs(base10Num);        
        String result = "";
        
        while(base10Num > 1){
            result = (base10Num % 2) + result;
            base10Num /= 2;
        }
        assert base10Num == 0 || base10Num == 1 : "value is not <= 1: " + base10Num;
        
        result = base10Num + result;
        assert all0sAnd1s(result);
        
        if( isNeg )
            result = "-" + result;
        return result;
    }
    
    /*
     * pre: cal != null
     * post: return true if val consists only of characters 1 and 0, false otherwise
     */

    public static boolean all0sAnd1s(String val){
        assert val != null : "Failed precondition all0sAnd1s. parameter cannot be null";
        boolean all = true;
        int i = 0;
        char c;
        
        while(all && i < val.length()){
            c = val.charAt(i);
            all = c == '0' || c == '1';
            i++;
        }
        return all;
    }
}

An example that shows the behavior of value parameters In Java

public class PrimitiveParameters
{ 
 public static void main(String[] args)
 { go();
 }
 
 public static void go()
 { int x = 3;
  int y = 2;
  System.out.println("In method go. x: " + x + " y: " + y);
  falseSwap(x,y);
  System.out.println("in method go. x: " + x + " y: " + y);
  moreParameters(x,y);
  System.out.println("in method go. x: " + x + " y: " + y);
 }
 
 public static void falseSwap(int x, int y)
 { System.out.println("in method falseSwap. x: " + x + " y: " + y);
  int temp = x;
  x = y;
  y = temp;
  System.out.println("in method falseSwap. x: " + x + " y: " + y);
 }
 
 public static void moreParameters(int a, int b)
 { System.out.println("in method moreParameters. a: " + a + " b: " + b);
  a = a * b;
  b = 12;
  System.out.println("in method moreParameters. a: " + a + " b: " + b);
  falseSwap(b,a);
  System.out.println("in method moreParameters. a: " + a + " b: " + b); 
 }
}

Examples of String manipulations in Java

public class StringExample
{ public static void main(String[] args)
 { String s1 = "Computer Science";
  int x = 307;
  String s2 = s1 + " " + x;
  String s3 = s2.substring(10,17);
  String s4 = "is fun";
  String s5 = s2 + s4;
  
  System.out.println("s1: " + s1);
  System.out.println("s2: " + s2);
  System.out.println("s3: " + s3);
  System.out.println("s4: " + s4);
  System.out.println("s5: " + s5);
  
  //showing effect of precedence
  
  x = 3;
  int y = 5;
  String s6 = x + y + "total";
  String s7 = "total " + x + y;
  String s8 = " " + x + y + "total";
  System.out.println("s6: " + s6);
  System.out.println("s7: " + s7);
  System.out.println("s8: " + s8);
 }
}

Program that compares counting words in files using an ArrayList and a Map

import java.io.File;
import java.io.IOException;
import java.util.Map;
import java.util.Scanner;
import java.util.TreeMap;

public class SimpleWordCounter {
    
    public static void main(String[] args) {
        try {
            File f = new File("ciaFactBook2008.txt");
            Scanner sc;
            sc = new Scanner(f);
            // sc.useDelimiter("[^a-zA-Z']+");
            Map<String, Integer> wordCount = new TreeMap<String, Integer>();
            while(sc.hasNext()) {
                String word = sc.next();
                if(!wordCount.containsKey(word))
                    wordCount.put(word, 1);
                else
                    wordCount.put(word, wordCount.get(word) + 1);
            }
            
            // show results
            for(String word : wordCount.keySet())
                System.out.println(word + " " + wordCount.get(word));
            System.out.println(wordCount.size());
        }
        catch(IOException e) {
            System.out.println("Unable to read from file.");
        }
    }
}

How to show the progressbar in asp.net

//_Default.aspx//


<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs"
    Inherits="_Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Display Progress using UpdateProgress - Sample</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:ScriptManager ID="ScriptManager1" runat="server">
        </asp:ScriptManager>
        <asp:UpdateProgress ID="updProgress" AssociatedUpdatePanelID="UpdatePanel1" runat="server">
            <ProgressTemplate>
                <img alt="progress" src="images/progress.gif" />
                Processing...
            </ProgressTemplate>
        </asp:UpdateProgress>
        <asp:UpdatePanel ID="UpdatePanel1" runat="server">
            <ContentTemplate>
                <asp:Label ID="lblText" runat="server" Text=""></asp:Label>
                <br />
                <br />
                <asp:Button ID="btnInvoke" runat="server" Text="Show" OnClick="btnInvoke_Click" />
            </ContentTemplate>
        </asp:UpdatePanel>
    </div>
    </form>
</body>
</html>


//Default.aspx.cs//


using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }

    protected void btnInvoke_Click(object sender, EventArgs e)
    {
        // Do some processing here
        System.Threading.Thread.Sleep(3000);
        lblText.Text = "Processing completed successfully";
    }

}

OUTPUT

Java Factorial Example

public class NumberFactorial {

        public static void main(String[] args) {
             
                int number = 5;
             
                /*
                 * Factorial of any number is !n.
                 * For example, factorial of 4 is 4*3*2*1.
                */
             
                int factorial = number;
             
                for(int i =(number - 1); i > 1; i--)
                {
                        factorial = factorial * i;
                }
     
                System.out.println("Factorial of a number is " + factorial);
        }
}

/*
Output of the Factorial program would be
Factorial of a number is 120
*/

Reverse Number using Java

public class ReverseNumber {

        public static void main(String[] args) {
               
               
                int number = 6789;
                int reversedNumber = 0;
                int temp = 0;
               
                while(number > 0){
                       
                      
                        temp = number%10;
                       
                   
                        reversedNumber = reversedNumber * 10 + temp;
                        number = number/10;
                         
                }
               
                
                System.out.println("Reversed Number is: " + reversedNumber);
        }
}

/*
Output of this Number Reverse program would be
Reversed Number is: 9876
*/

Swap Numbers Without Using Third Variable in Java

public class SwapElementsWithoutThirdVariableExample {

        public static void main(String[] args) {
               
                int num1 = 12;
                int num2 = 15;
               
                System.out.println("Before Swapping");
                System.out.println("Value of num1 is :" + num1);
                System.out.println("Value of num2 is :" +num2);
               
              
                num1 = num1 + num2;
                num2 = num1 - num2;
                num1 = num1 - num2;
               
                System.out.println("Before Swapping");
                System.out.println("Value of num1 is :" + num1);
                System.out.println("Value of num2 is :" +num2);
        }


}

/*
Output of Swap Numbers Without Using Third Variable example would be
Before Swapping
Value of num1 is :12
Value of num2 is :15
After Swapping
Value of num1 is :15
Value of num2 is :12
*/

Find Largest and Smallest Number in an Array using Java

public class FindLargestSmallestNumber {

        public static void main(String[] args) {
               
             
                int numbers[] = new int[]{45,44,35,50,17,58,78,99,40,13};
               
             
                int smallest = numbers[0];
                int largetst = numbers[0];
               
                for(int i=1; i< numbers.length; i++)
                {
                        if(numbers[i] > largetst)
                                largetst = numbers[i];
                        else if (numbers[i] < smallest)
                                smallest = numbers[i];
                       
                }
               
                System.out.println("Largest Number is : " + largetst);
                System.out.println("Smallest Number is : " + smallest);
        }
}

/*
Output of this program would be
Largest Number is : 99
Smallest Number is : 13
*/

Calculate Rectangle Perimeter using Java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class CalculateRectPerimeter {

        public static void main(String[] args) {
               
                int width = 0;
                int length = 0;
                       
                try
                {
                      
                        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
                       
                        System.out.println("Please enter length of a rectangle");
                        length = Integer.parseInt(br.readLine());

                    
                        System.out.println("Please enter width of a rectangle");
                        width = Integer.parseInt(br.readLine());
                       
                       
                }
            
                catch(NumberFormatException ne)
                {
                        System.out.println("Invalid value" + ne);
                        System.exit(0);
                }
                catch(IOException ioe)
                {
                        System.out.println("IO Error :" + ioe);
                        System.exit(0);
                }
               
                /*
                 * Perimeter of a rectangle is
                 * 2 * (length + width)
                */
               
                int perimeter = 2 * (length + width);
               
                System.out.println("Perimeter of a rectangle is " + perimeter);
        }
               
}

/*
Output of Calculate Rectangle Perimeter using Java Example would be
Please enter length of a rectangle
10
Please enter width of a rectangle
12
Perimeter of a rectangle is 44
*/

Calculate Rectangle Area using Java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class CalculateRectArea {

        public static void main(String[] args) {
               
                int width = 0;
                int length = 0;
                       
                try
                {
                     
                        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
                       
                        System.out.println("Please enter length of a rectangle");
                        length = Integer.parseInt(br.readLine());

                     
                        System.out.println("Please enter width of a rectangle");
                        width = Integer.parseInt(br.readLine());
                       
                       
                }
            
                catch(NumberFormatException ne)
                {
                        System.out.println("Invalid value" + ne);
                        System.exit(0);
                }
                catch(IOException ioe)
                {
                        System.out.println("IO Error :" + ioe);
                        System.exit(0);
                }
               
                /*
                 * Area of a rectangle is
                 * length * width
                */
               
                int area = length * width;
               
                System.out.println("Area of a rectangle is " + area);
        }
               
}

/*
Output of Calculate Rectangle Area using Java Example would be
Please enter length of a rectangle
10
Please enter width of a rectangle
12
Area of a rectangle is 120
*/

Calculate Circle Perimeter using Java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class CalculateCirclePerimeterExample {

        public static void main(String[] args) {
               
                int radius = 0;
                System.out.println("Please enter radius of a circle");
               
                try
                {
                      
                        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
                        radius = Integer.parseInt(br.readLine());
                }
              
                catch(NumberFormatException ne)
                {
                        System.out.println("Invalid radius value" + ne);
                        System.exit(0);
                }
                catch(IOException ioe)
                {
                        System.out.println("IO Error :" + ioe);
                        System.exit(0);
                }
               
                /*
                 * Perimeter of a circle is
                 * 2 * pi * r
                 * where r is a radius of a circle.
                 */
               
                //NOTE : use Math.PI constant to get value of pi
                double perimeter = 2 * Math.PI * radius;
               
                System.out.println("Perimeter of a circle is " + perimeter);
        }
}

/*
Output of Calculate Circle Perimeter using Java Example would be
Please enter radius of a circle
15
Perimeter of a circle is 94.28571428571429
*/

Calculate Circle Area using Java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class CalculateCircleAreaExample {

        public static void main(String[] args) {
               
                int radius = 0;
                System.out.println("Please enter radius of a circle");
               
                try
                {
                       
                        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
                        radius = Integer.parseInt(br.readLine());
                }
               
                catch(NumberFormatException ne)
                {
                        System.out.println("Invalid radius value" + ne);
                        System.exit(0);
                }
                catch(IOException ioe)
                {
                        System.out.println("IO Error :" + ioe);
                        System.exit(0);
                }
               
                /*
                 * Area of a circle is
                 * pi * r * r
                 * where r is a radius of a circle.
                 */
               
                //NOTE : use Math.PI constant to get value of pi
                double area = Math.PI * radius * radius;
               
                System.out.println("Area of a circle is " + area);
        }
}

/*
Output of Calculate Circle Area using Java Example would be
Please enter radius of a circle
15
Area of a circle is 707.1428571428571
*/

How to get dropdownlist selected item value in asp.net

// Default.aspx //


<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
  
  <asp:DropDownList ID="ddlMonth" Width="200px" runat="server">
            <asp:ListItem Value="0">--Select--</asp:ListItem>
            <asp:ListItem Value="1">January</asp:ListItem>
            <asp:ListItem Value="2">February</asp:ListItem>
            <asp:ListItem Value="3">March</asp:ListItem>
            <asp:ListItem Value="4">April</asp:ListItem>
            <asp:ListItem Value="5">May</asp:ListItem>
            <asp:ListItem Value="6">June</asp:ListItem>
            <asp:ListItem Value="7">July</asp:ListItem>
            <asp:ListItem Value="8">August</asp:ListItem>
            <asp:ListItem Value="9">September</asp:ListItem>
            <asp:ListItem Value="10">October</asp:ListItem>
            <asp:ListItem Value="11">November</asp:ListItem>
            <asp:ListItem Value="12">December</asp:ListItem>
        </asp:DropDownList><br /><br />
        <asp:Button ID="btnGetMonth" runat="server" Text="Get Month" 
            onclick="btnGetMonth_Click" /><br /><br />
        Selected Value :  <asp:Label ID="lblMonthVal" runat="server" Text="Label"></asp:Label>
<br />
        Selected Item :  <asp:Label ID="lblMonthItem" runat="server" Text="Label"></asp:Label>
    </form>
</body>
</html>


// Default.aspx.cs //


using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)

    {
     }
protected void btnGetMonth_Click(object sender, EventArgs e)
        {
            lblMonthVal.Text =  ddlMonth.SelectedValue; 
            lblMonthItem.Text = ddlMonth.SelectedItem.Text;

        }

}

Select Day, Month and Year Date from DropDownList in ASP.Net

// Default.aspx //

<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    Year:<asp:DropDownList ID="ddlYear" runat="server" onchange = "PopulateDays()" />
    Month:<asp:DropDownList ID="ddlMonth" runat="server" onchange = "PopulateDays()" />
    Day:<asp:DropDownList ID="ddlDay" runat="server" />
    <br /> 
         <asp:CustomValidator ID="Validator" runat="server" ErrorMessage="* Required"
               ClientValidationFunction = "Validate" />
    </div>
    </form>
</body>
</html>


// Default.aspx.cs //


using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            if (this.SelectedDate == DateTime.MinValue)
            {
                this.PopulateYear();
                this.PopulateMonth();
                this.PopulateDay();
            }
        }
        else
        {
            if (Request.Form[ddlDay.UniqueID] != null)
            {
                this.PopulateDay();
                ddlDay.ClearSelection();
                ddlDay.Items.FindByValue(Request.Form[ddlDay.UniqueID]).Selected = true;
            }
        }

    }

    private int Day
    {
        get
        {
            if (Request.Form[ddlDay.UniqueID] != null)
            {
                return int.Parse(Request.Form[ddlDay.UniqueID]);
            }
            else
            {
                return int.Parse(ddlDay.SelectedItem.Value);
            }
        }
        set
        {
            this.PopulateDay();
            ddlDay.ClearSelection();
            ddlDay.Items.FindByValue(value.ToString()).Selected = true;
        }
    }
    private int Month
    {
        get
        {
            return int.Parse(ddlMonth.SelectedItem.Value);
        }
        set
        {
            this.PopulateMonth();
            ddlMonth.ClearSelection();
            ddlMonth.Items.FindByValue(value.ToString()).Selected = true;
        }
    }
    private int Year
    {
        get
        {
            return int.Parse(ddlYear.SelectedItem.Value);
        }
        set
        {
            this.PopulateYear();
            ddlYear.ClearSelection();
            ddlYear.Items.FindByValue(value.ToString()).Selected = true;
        }
    }

    public DateTime SelectedDate
    {
        get
        {
            try
            {
                return DateTime.Parse(this.Month + "/" + this.Day + "/" + this.Year);
            }
            catch
            {
                return DateTime.MinValue;
            }
        }
        set
        {
            if (!value.Equals(DateTime.MinValue))
            {
                this.Year = value.Year;
                this.Month = value.Month;
                this.Day = value.Day;
            }
        }
    }

    private void PopulateDay()
    {
        ddlDay.Items.Clear();
        ListItem lt = new ListItem();
        lt.Text = "DD";
        lt.Value = "0";
        ddlDay.Items.Add(lt);
        int days = DateTime.DaysInMonth(this.Year, this.Month);
        for (int i = 1; i <= days; i++)
        {
            lt = new ListItem();
            lt.Text = i.ToString();
            lt.Value = i.ToString();
            ddlDay.Items.Add(lt);
        }
        ddlDay.Items.FindByValue(DateTime.Now.Day.ToString()).Selected = true;
    }

    private void PopulateMonth()
    {
        ddlMonth.Items.Clear();
        ListItem lt = new ListItem();
        lt.Text = "MM";
        lt.Value = "0";
        ddlMonth.Items.Add(lt);
        for (int i = 1; i <= 12; i++)
        {
            lt = new ListItem();
            lt.Text = Convert.ToDateTime(i.ToString() + "/1/1900").ToString("MMMM");
            lt.Value = i.ToString();
            ddlMonth.Items.Add(lt);
        }
        ddlMonth.Items.FindByValue(DateTime.Now.Month.ToString()).Selected = true;
    }

    private void PopulateYear()
    {
        ddlYear.Items.Clear();
        ListItem lt = new ListItem();
        lt.Text = "YYYY";
        lt.Value = "0";
        ddlYear.Items.Add(lt);
        for (int i = DateTime.Now.Year; i >= 1950; i--)
        {
            lt = new ListItem();
            lt.Text = i.ToString();
            lt.Value = i.ToString();
            ddlYear.Items.Add(lt);
        }
        ddlYear.Items.FindByValue(DateTime.Now.Year.ToString()).Selected = true;
    }

}

OUTPUT

Java program to transpose matrix

import java.util.Scanner;

class TransposeAMatrix
{
   public static void main(String args[])
   {
      int m, n, c, d;

      Scanner in = new Scanner(System.in);
      System.out.println("Enter the number of rows and columns of matrix");
      m = in.nextInt();
      n = in.nextInt();

      int matrix[][] = new int[m][n];

      System.out.println("Enter the elements of matrix");

      for ( c = 0 ; c < m ; c++ )
         for ( d = 0 ; d < n ; d++ )
            matrix[c][d] = in.nextInt();

      int transpose[][] = new int[n][m];

      for ( c = 0 ; c < m ; c++ )
      {
         for ( d = 0 ; d < n ; d++ )               
            transpose[d][c] = matrix[c][d];
      }

      System.out.println("Transpose of entered matrix:-");

      for ( c = 0 ; c < n ; c++ )
      {
         for ( d = 0 ; d < m ; d++ )
               System.out.print(transpose[c][d]+"\t");

         System.out.print("\n");
      }
   }
}

OUTPUT

How to implement paging and sorting in asp.net Gridview control?

// Example.aspx //


<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Example.aspx.cs" Inherits="_Example" %>  
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Gridview Paging and Sorting </title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <div style="font-size: 20px; font-family: Verdana">
           <u> Gridview Paging and Sorting</u>
            <br />
            <br />
        </div>
        <div>
            <asp:GridView ID="GridVwPagingSorting" runat="server" AutoGenerateColumns="False"
                Font-Names="Verdana" AllowPaging="True" AllowSorting="True" PageSize="5" Width="75%"
                OnPageIndexChanging="PageIndexChanging" BorderColor="#CCCCCC" BorderStyle="Solid"
                BorderWidth="1px" OnSorting="Sorting">
                <AlternatingRowStyle BackColor="#BFE4FF" />
                <PagerStyle BorderColor="#CCCCCC" BorderStyle="Solid" BorderWidth="1px" />
                <HeaderStyle Height="30px" BackColor="#6DC2FF" Font-Size="15px" BorderColor="#CCCCCC"
                    BorderStyle="Solid" BorderWidth="1px" />
                <RowStyle Height="20px" Font-Size="13px" BorderColor="#CCCCCC" BorderStyle="Solid"
                    BorderWidth="1px" />
                <Columns>
                    <asp:BoundField DataField="Emp_Name" HeaderText="Employee Name" SortExpression="Emp_Name" />
                    <asp:BoundField DataField="Emp_id" HeaderText="Employee ID" SortExpression="Emp_id" />
                    <asp:BoundField DataField="Emp_job" HeaderText="Job title" SortExpression="Emp_job" />
                    <asp:BoundField DataField="Emp_Dep" HeaderText="Department" SortExpression="Emp_Dep" />
                </Columns>
            </asp:GridView>
        </div>
        <div style="color: Green; font-weight: bold">
            <br />
            <i>You are viewing page
                <%=GridVwPagingSorting.PageIndex + 1%>
                of
                <%=GridVwPagingSorting.PageCount%>
            </i>
        </div>
    </div>
    </form>
</body>
</html>



// Example.aspx.cs //

using System;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Web.UI.WebControls;

public partial class Example : System.Web.UI.Page
{

string Sort_Direction = "Emp_Name ASC";
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                  ViewState["SortExpr"] = Sort_Direction;
                  DataView dvEmployee = Getdata();
                  GridVwPagingSorting.DataSource = dvEmployee;
                  GridVwPagingSorting.DataBind();
            }
        }
private DataView Getdata()
        {
            using (SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["ConnectionString"].ToString()))
            {
                DataSet dsEmployee = new DataSet();
                string strSelectCmd = "SELECT [Emp_Name],[Emp_id],[Emp_job],[Emp_Dep],[Emp_Salary] FROM [employee]";
                SqlDataAdapter da = new SqlDataAdapter(strSelectCmd, conn);
                da.Fill(dsEmployee, "Employee");
                DataView dvEmp = dsEmployee.Tables["Employee"].DefaultView;
                dvEmp.Sort = ViewState["SortExpr"].ToString();
                return dvEmp;    
            }
        }

protected void PageIndexChanging(object sender, GridViewPageEventArgs e)
        {
            GridVwPagingSorting.PageIndex = e.NewPageIndex;
            DataView dvEmployee = Getdata();
            GridVwPagingSorting.DataSource = dvEmployee;
            GridVwPagingSorting.DataBind();
        }

protected void Sorting(object sender, GridViewSortEventArgs e)
        {
            string[] SortOrder = ViewState["SortExpr"].ToString().Split(' ');
            if (SortOrder[0] == e.SortExpression)
            {
                if (SortOrder[1] == "ASC")
                {
                    ViewState["SortExpr"] = e.SortExpression + " " + "DESC";
                }
                else
                {
                    ViewState["SortExpr"] = e.SortExpression + " " + "ASC";
                }
            }
            else
            {
                ViewState["SortExpr"] = e.SortExpression + " " + "ASC";
            }
            GridVwPagingSorting.DataSource = Getdata();
            GridVwPagingSorting.DataBind();
        }
}

SQL TABLE

OUTPUT

Java program to compare two strings

import java.util.Scanner;

class CompareStrings
{
   public static void main(String args[])
   {
      String s1, s2;
      Scanner in = new Scanner(System.in);

      System.out.println("Enter the first string");
      s1 = in.nextLine();

      System.out.println("Enter the second string");
      s2 = in.nextLine();

      if ( s1.compareTo(s2) > 0 )
         System.out.println("First string is greater than second.");
      else if ( s1.compareTo(s2) < 0 )
         System.out.println("First string is smaller than second.");
      else   
         System.out.println("Both strings are equal.");
   }
}

OUTPUT

Java program to display date and time

import java.util.*;

class GetCurrentDateAndTime
{
   public static void main(String args[])
   {
      int day, month, year;
      int second, minute, hour;
      GregorianCalendar date = new GregorianCalendar();

      day = date.get(Calendar.DAY_OF_MONTH);
      month = date.get(Calendar.MONTH);
      year = date.get(Calendar.YEAR);

      second = date.get(Calendar.SECOND);
      minute = date.get(Calendar.MINUTE);
      hour = date.get(Calendar.HOUR);

      System.out.println("Current date is  "+day+"/"+(month+1)+"/"+year);
      System.out.println("Current time is  "+hour+" : "+minute+" : "+second);
   }
}

OUTPUT

Java program to generate random numbers

import java.util.*;

class RandomNumbers {
  public static void main(String[] args) {
    int c;
    Random t = new Random();

    // random integers in [0, 100]

    for (c = 1; c <= 10; c++) {
      System.out.println(t.nextInt(100));
    }
  }
}

OUTPUT

Java program to bubble sort

import java.util.Scanner;

class BubbleSort {
  public static void main(String []args) {
    int n, c, d, swap;
    Scanner in = new Scanner(System.in);

    System.out.println("Input number of integers to sort");
    n = in.nextInt();

    int array[] = new int[n];

    System.out.println("Enter " + n + " integers");

    for (c = 0; c < n; c++) 
      array[c] = in.nextInt();

    for (c = 0; c < ( n - 1 ); c++) {
      for (d = 0; d < n - c - 1; d++) {
        if (array[d] > array[d+1]) /* For descending order use < */
        {
          swap       = array[d];
          array[d]   = array[d+1];
          array[d+1] = swap;
        }
      }
    }

    System.out.println("Sorted list of numbers");

    for (c = 0; c < n; c++) 
      System.out.println(array[c]);
  }
}

OUTPUT

How to get input from user in java

import java.util.Scanner;

class GetInputFromUser
{
   public static void main(String args[])
   {
      int a;
      float b;
      String s;

      Scanner in = new Scanner(System.in);

      System.out.println("Enter a string");
      s = in.nextLine();
      System.out.println("You entered string "+s);

      System.out.println("Enter an integer");
      a = in.nextInt();
      System.out.println("You entered integer "+a);

      System.out.println("Enter a float");
      b = in.nextFloat();
      System.out.println("You entered float "+b);   
   }
}

OUTPUT

Java program for binary search

import java.util.Scanner;

class BinarySearch 
{
  public static void main(String args[])
  {
    int c, first, last, middle, n, search, array[];

    Scanner in = new Scanner(System.in);
    System.out.println("Enter number of elements");
    n = in.nextInt(); 
    array = new int[n];

    System.out.println("Enter " + n + " integers");


    for (c = 0; c < n; c++)
      array[c] = in.nextInt();

    System.out.println("Enter value to find");
    search = in.nextInt();

    first  = 0;
    last   = n - 1;
    middle = (first + last)/2;

    while( first <= last )
    {
      if ( array[middle] < search )
        first = middle + 1;    
      else if ( array[middle] == search ) 
      {
        System.out.println(search + " found at location " + (middle + 1) + ".");
        break;
      }
      else
         last = middle - 1;

      middle = (first + last)/2;
   }
   if ( first > last )
      System.out.println(search + " is not present in the list.\n");
  }
}

OUTPUT