How to disable back button in Web Browser

 Disable back button in Web Browser

1)Using Filter In Web.xml

<filter>
<filter-name>noCacheFilter</filter-name>
<filter-class>com.LoginFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>noCacheFilter</filter-name>
<url-pattern>*.jsp</url-pattern>
</filter-mapping>

Call The Servlet LoginFilter for every Request 

package com;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import com.sap.mw.jco.JCO.Request;


public class LoginFilter implements Filter{


public void init(FilterConfig config) throws ServletException {
// If you have any <init-param> in web.xml, then you could get them
// here by config.getInitParameter("name") and assign it as field.
}

public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest) req;
HttpServletResponse response = (HttpServletResponse) res;
HttpSession session = request.getSession(false);
System.out.println("filter called");

response.setHeader("Cache-Control", "no-cache, no-store, must-revalidate"); // HTTP 1.1.
response.setHeader("Pragma", "no-cache"); // HTTP 1.0.
response.setDateHeader("Expires", 0);
chain.doFilter(req, res);
//response.sendRedirect(request.getContextPath() + "/login.jsp"); // No logged-in user found, so redirect to login page.
}

public void destroy() {
// If you have assigned any expensive resources as field of
// this Filter class, then you could clean/close them here.
}

}

Addition of number in Given String using Java Program

Addition of number in Given String using Java Program
Example
String is "121Bharat23"
Addition on 1+2+1+2+3=9

******************************************************
public class StringOperation {
public static void main(String[] args) {

String GivenString="121Bharat23";
int Total=0;
char stringarray[]=GivenString.toCharArray();
for(int i=0;i<stringarray.length;i++)
{
//System.out.println(stringarray[i]);
if(Character.isDigit(stringarray[i]))
{
int b = Character.getNumericValue(stringarray[i]);
             Total+=b;
}
}
System.out.println("Total=="+Total);

}
}

********************************************

Out Put

Total==9

Sorting Array (Bubble Sort)

public class Sorting {


public static void main(String[] args) {

int a[]={9,3,6,8,1,2,4,6};
for(int i=0;i<a.length;i++)
{
System.out.print(a[i]);
}
System.out.println("\n");
int temp;
for(int k=0;k<a.length;k++)
{
 for(int z=0;z<a.length-1;z++)
 {
if(a[z] > a[z+1])
{
temp=a[z];
a[z]=a[z+1];
a[z+1]=temp;
}

 }
}
for(int i=0;i<a.length;i++)
{
System.out.print(a[i]);
}
}

}


Out Put

93681246

12346689