Create Empty DOM Document

package com.usr.xml.dom;

import javax.xml.parsers.DocumentBuilder;

import javax.xml.parsers.DocumentBuilderFactory;

import org.w3c.dom.Document;

public class CreateEmptyDOMDocument {

public static void main(String[] args) {

       System.out.println("creating empty DOM Document");

       try{

              DocumentBuilderFactory dbf=DocumentBuilderFactory.newInstance();

              DocumentBuilder db=dbf.newDocumentBuilder();

              Document doc=db.newDocument();

       }

       catch(Exception ex){

              ex.printStackTrace();

       }

       System.out.println("empty DOM Document created");

}

}

java program to read properties xml file

userinfo.xml

<?xml version="1.0" encoding="UTF-8" standalone="no"?>

<!DOCTYPE properties SYSTEM "http://java.sun.com/dtd/properties.dtd">

<properties>

<comment>User Info</comment>

<entry key="age">38</entry>

<entry key="password">india@123</entry>

<entry key="username">sachin</entry>

</properties>

package com.usr.properties;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.IOException;

import java.io.InputStream;

import java.util.Enumeration;

import java.util.Properties;

public class ReadPropertiesXmlFile {

       public static void main(String[] args) {

              Properties pr = new Properties();

              try {

                     InputStream is = new FileInputStream("userinfo.xml");

                     pr.loadFromXML(is);

                     is.close();

                     Enumeration enumKeys = pr.keys();

                     while (enumKeys.hasMoreElements()) {

                           String key = (String) enumKeys.nextElement();

                           String value = pr.getProperty(key);

                           System.out.println(key + ":" + value);

                     }

              } catch (FileNotFoundException ex) {

                     ex.printStackTrace();

              } catch (IOException ex) {

                     ex.printStackTrace();

              }

       }

}

OUTPUT

age:38
password:india@123
username:sachin
 

java program to convert properties file into xml file

userinfo.properties

username=sachin

password=india@123

age=38

package com.usr.properties;

import java.io.BufferedReader;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.OutputStream;

import java.util.Properties;

public class PropertiesToXML {

       public static void main(String[] args) {

              File file=new File("userinfo.properties");

              try{

                     FileInputStream fis=new FileInputStream(file);

                     BufferedReader br=new BufferedReader(new InputStreamReader(fis));

                     Properties pr=new Properties();

                     pr.load(br);

                     OutputStream os=new FileOutputStream("userinfo.xml");

                     pr.storeToXML(os,"User Info", "UTF-8");

                     System.out.println("converted to xml");

                     br.close();

                     fis.close();

                     os.close();

              }

              catch(FileNotFoundException ex){

                     ex.printStackTrace();

              }

              catch (IOException ex) {

                     ex.printStackTrace();

              }

       }

}

OUTPUT

userinfo.xml 

<?xml version="1.0" encoding="UTF-8" standalone="no"?>

<!DOCTYPE properties SYSTEM "http://java.sun.com/dtd/properties.dtd">

<properties>

<comment>User Info</comment>

<entry key="age">38</entry>

<entry key="password">india@123</entry>

<entry key="username">sachin</entry>

</properties>

java program to find second largest number in array

package com.usr.arrays;

public class SecondLargestNumberInArray {

       public static void main(String[] args) {

              int arr[] = { 1, 23, 47, 81, 92, 88, 52, 48, 56, 66, 65, 76, 71, 85,

                           49, 53, 56, 61, 65, 84 };

              secondLargeNumber(arr);

       }

       public static void secondLargeNumber(int[] arr) {

              int largest = arr[0];

              int secondLargest = arr[0];

              for (int i = 0; i < arr.length; i++) {

                     if (arr[i] > largest) {

                           secondLargest = largest;

                           largest = arr[i];

                         

                     } else if (arr[i] > secondLargest) {

                           secondLargest = arr[i];

                         

                     }

              }

              System.out.println("second largest in array is:" + secondLargest);

       }

}