JAVA EE: February 2017

Tuesday, 28 February 2017

Java Tutorial: System class in java - Playlist

Click here to watch in Youtube :
https://www.youtube.com/watch?v=QLcKjdm0Umc&list=PLmCsXDGbJHdgTt-96GQ0XMx8uBC9Qc04C

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Servlets Tutorial

All Design Patterns Links

JDBC Tutorial

Java Collection Framework Tutorial

JAVA Tutorial

Kids Tutorial

Java Tutorial: System class in java [How to get the default value if Key is not present]

Click here to watch in Youtube :
https://www.youtube.com/watch?v=-NwT89yD15Y&list=UUhwKlOVR041tngjerWxVccw

PropertiesDemo.java

/*
 * public static String getProperty(String key, String
 *                                               def)
 * 
 * Parameters: 
 * ----------
 * 
 * key - the name of the system property.  
 * def - a default value.
 */

public class PropertiesDemo
{

    public static void main(String[] args)
    {
        /*
         * Gets the system property indicated by the
         * specified key.if not present it will return
         * default value.
         */
        String value1 = System.getProperty("a.b", "hello");
        System.out.println("value1 = " + value1);

        
        String value2 = System.getProperty("os.name", "hello");
        System.out.println("value2 = " + value2);
        
    }
}

Output

value1 = hello
value2 = Windows 7

Click the below link to download the code:
https://sites.google.com/site/ramj2eev1/home/javabasics/System_getProperty_default_App.zip?attredirects=0&d=1

Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/System_getProperty_default_App

Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/fecc858ed896ce9bbf3cb92f5d438fc2de9eee22/BasicJava/System_getProperty_default_App/?at=master

See also:

All JavaEE Viedos Playlist

All JavaEE Viedos

All JAVA EE Links

Servlets Tutorial

All Design Patterns Links

JDBC Tutorial

Java Collection Framework Tutorial

JAVA Tutorial

Kids Tutorial

Java Tutorial: System class in java [How to get the system property indicated by the specified key]

Click here to watch in Youtube :
https://www.youtube.com/watch?v=QLcKjdm0Umc&list=UUhwKlOVR041tngjerWxVccw

PropertiesDemo.java

/*
 * public static String getProperty(String key)
 *
 * Parameters:
 * ----------
 *
 * key - the name of the system property.
 */

public class PropertiesDemo
{

    public static void main(String[] args)
    {
        /*
         * Gets the system property indicated by the
         * specified key.
         */
        String value = System.getProperty("os.name");
        System.out.println("value = " + value);

        String value1 = System.getProperty("a.b");
        System.out.println("value1 = " + value1);

    }
}

Output

value = Windows 7
value1 = null

Click the below link to download the code:
https://sites.google.com/site/ramj2eev1/home/javabasics/System_getProperty_App.zip?attredirects=0&d=1

Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/System_getProperty_App

Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/fecc858ed896ce9bbf3cb92f5d438fc2de9eee22/BasicJava/System_getProperty_App/?at=master

See also:

All JavaEE Viedos Playlist

All JavaEE Viedos

All JAVA EE Links

Servlets Tutorial

All Design Patterns Links

JDBC Tutorial

Java Collection Framework Tutorial

JAVA Tutorial

Kids Tutorial

Java Tutorial: Properties class in java [How to get all the system properties]

Click here to watch in Youtube :
https://www.youtube.com/watch?v=uxBVYUluWb4&list=UUhwKlOVR041tngjerWxVccw

Click the below Image to Enlarge

Java Tutorial: Properties class in java [How to get all the system properties]

PropertiesDemo.java

import java.io.IOException;
import java.util.Iterator;
import java.util.Properties;
import java.util.Set;

class PropertiesDemo
{

    public static void main(String[] args) throws IOException
    {

        /*
         * Returns the system properties
         */
        Properties p = System.getProperties();

        /*
         * Returns a set of keys in this property list where
         * the key and its corresponding value are strings,
         * including distinct keys in the default property
         * list if a key of the same name has not already
         * been found from the main properties list.
         */
        Set<String> set = p.stringPropertyNames();

        Iterator<String> itr = set.iterator();

        while (itr.hasNext())
        {
            String key = (String) itr.next();
            /*
             * Gets the system property indicated by the
             * specified key.
             */
            String value = p.getProperty(key);
            System.out.println(key + " = " + value);
        }

    }
}

Output

java.runtime.name = Java(TM) SE Runtime Environment
sun.boot.library.path = C:\Java\jre1.8.0_111\bin
java.vm.version = 25.111-b14
java.vm.vendor = Oracle Corporation
java.vendor.url = http://java.oracle.com/
path.separator = ;
java.vm.name = Java HotSpot(TM) 64-Bit Server VM
file.encoding.pkg = sun.io
user.script = 
user.country = US
sun.java.launcher = SUN_STANDARD
sun.os.patch.level = Service Pack 1
java.vm.specification.name = Java Virtual Machine Specification
user.dir = D:\eclipse\workspace\PropertiesDemo
java.runtime.version = 1.8.0_111-b14
java.awt.graphicsenv = sun.awt.Win32GraphicsEnvironment
java.endorsed.dirs = C:\Java\jre1.8.0_111\lib\endorsed
os.arch = amd64
java.io.tmpdir = C:\Users\Ramesh\AppData\Local\Temp\
line.separator = 

java.vm.specification.vendor = Oracle Corporation
user.variant = 
os.name = Windows 7
sun.jnu.encoding = Cp1252
java.library.path = C:\Java\jre1.8.0_111\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:/Java/jre1.8.0_111/bin/server;C:/Java/jre1.8.0_111/bin;C:/Java/jre1.8.0_111/lib/amd64;C:\ProgramData\Oracle\Java\javapath;C:\Program Files (x86)\AMD APP\bin\x86_64;C:\Program Files (x86)\AMD APP\bin\x86;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files\Intel\WiFi\bin\;C:\Program Files\Common Files\Intel\WirelessCommon\;C:\Program Files\Lenovo\Bluetooth Software\;C:\Program Files\Lenovo\Bluetooth Software\syswow64;C:\Program Files\OpenVPN\bin;C:\Java\jdk1.8.0_111\bin;C:\Program Files\TortoiseGit\bin;C:\Program Files\Git\cmd;C:\Program Files\TortoiseHg\;C:\Program Files\Intel\WiFi\bin\;C:\Program Files\Common Files\Intel\WirelessCommon\;D:\eclipse;;.
java.specification.name = Java Platform API Specification
java.class.version = 52.0
sun.management.compiler = HotSpot 64-Bit Tiered Compilers
os.version = 6.1
user.home = C:\Users\Ramesh
user.timezone = 
java.awt.printerjob = sun.awt.windows.WPrinterJob
file.encoding = Cp1252
java.specification.version = 1.8
user.name = Ramesh
java.class.path = D:\eclipse\workspace\PropertiesDemo\bin
java.vm.specification.version = 1.8
sun.arch.data.model = 64
java.home = C:\Java\jre1.8.0_111
sun.java.command = PropertiesDemo
java.specification.vendor = Oracle Corporation
user.language = en
awt.toolkit = sun.awt.windows.WToolkit
java.vm.info = mixed mode
java.version = 1.8.0_111
java.ext.dirs = C:\Java\jre1.8.0_111\lib\ext;C:\Windows\Sun\Java\lib\ext
sun.boot.class.path = C:\Java\jre1.8.0_111\lib\resources.jar;C:\Java\jre1.8.0_111\lib\rt.jar;C:\Java\jre1.8.0_111\lib\sunrsasign.jar;C:\Java\jre1.8.0_111\lib\jsse.jar;C:\Java\jre1.8.0_111\lib\jce.jar;C:\Java\jre1.8.0_111\lib\charsets.jar;C:\Java\jre1.8.0_111\lib\jfr.jar;C:\Java\jre1.8.0_111\classes
java.vendor = Oracle Corporation
file.separator = \
java.vendor.url.bug = http://bugreport.sun.com/bugreport/
sun.cpu.endian = little
sun.io.unicode.encoding = UnicodeLittle
sun.desktop = windows
sun.cpu.isalist = amd64

Click the below link to download the code:
https://sites.google.com/site/ramj2eev1/home/javabasics/PropertiesDemo_System_App.zip?attredirects=0&d=1

Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/PropertiesDemo_System_App

Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/fecc858ed896ce9bbf3cb92f5d438fc2de9eee22/BasicJava/PropertiesDemo_System_App/?at=master

See also:

All JavaEE Viedos Playlist

All JavaEE Viedos

All JAVA EE Links

Servlets Tutorial

All Design Patterns Links

JDBC Tutorial

Java Collection Framework Tutorial

JAVA Tutorial

Kids Tutorial

Java Tutorial: Properties class in java [How to get the keys using stringPropertyNames method]

Click here to watch in Youtube :
https://www.youtube.com/watch?v=YnO_MQvHwRg&list=UUhwKlOVR041tngjerWxVccw

db.properties

Java Tutorial: Properties class in java [How to get the keys using stringPropertyNames method]

PropertiesDemo.java

import java.io.FileReader;
import java.io.IOException;
import java.util.Iterator;
import java.util.Properties;
import java.util.Set;

/*
 * public Set<String> stringPropertyNames()
 * 
 * Returns: 
 * --------
 * 
 * a set of keys in this property list where the key and
 * its corresponding value are strings, including the
 * keys in the default property list.
 */

class PropertiesDemo
{

    public static void main(String[] args) throws IOException
    {
        FileReader fileReader = null;
        try
        {
            fileReader = new FileReader("db.properties");

            Properties p = new Properties();
            /*
             * Reads a property list (key and element pairs)
             * from the input character stream in a simple
             * line-oriented format.
             */
            p.load(fileReader);

            /*
             * Returns a set of keys in this property list
             * where the key and its corresponding value are
             * strings, including distinct keys in the
             * default property list if a key of the same
             * name has not already been found from the main
             * properties list.
             */
            Set<String> set = p.stringPropertyNames();

            Iterator<String> itr = set.iterator();

            while (itr.hasNext())
            {
                String key = (String) itr.next();
                String value = p.getProperty(key);
                System.out.println("Key = " + key + " , Value = " + value);
            }

        }
        finally
        {
            if (fileReader != null)
            {
                fileReader.close();
            }
        }
    }
}

Output

Key = user , Value = root 
Key = password , Value = oracle

Click the below link to download the code:
https://sites.google.com/site/ramj2eev1/home/javabasics/PropertiesDemo_stringPropertyNames_App.zip?attredirects=0&d=1

Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/PropertiesDemo_stringPropertyNames_App

Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/fecc858ed896ce9bbf3cb92f5d438fc2de9eee22/BasicJava/PropertiesDemo_stringPropertyNames_App/?at=master

See also:

All JavaEE Viedos Playlist

All JavaEE Viedos

All JAVA EE Links

Servlets Tutorial

All Design Patterns Links

JDBC Tutorial

Java Collection Framework Tutorial

JAVA Tutorial

Kids Tutorial

Java Tutorial: Properties class in java [How to get the keys using propertyNames method]

Click here to watch in Youtube :
https://www.youtube.com/watch?v=hyPnVZSukyY&list=UUhwKlOVR041tngjerWxVccw

db.properties

Java Tutorial: Properties class in java [How to get the keys using propertyNames method]

PropertiesDemo.java

import java.io.FileReader;
import java.io.IOException;
import java.util.Enumeration;
import java.util.Properties;

/*
 * public Enumeration<?> propertyNames()
 *  
 * Returns: 
 * --------
 * 
 * an enumeration of all the keys in this property list,
 * including the keys in the default property list.
 */

class PropertiesDemo
{

    public static void main(String[] args) throws IOException
    {
        FileReader fileReader = null;
        try
        {
            fileReader = new FileReader("db.properties");

            Properties p = new Properties();
            /*
             * Reads a property list (key and element pairs)
             * from the input character stream in a simple
             * line-oriented format.
             */
            p.load(fileReader);

            /*
             * Returns an enumeration of all the keys in
             * this property list, including distinct keys
             * in the default property list if a key of the
             * same name has not already been found from the
             * main properties list.
             */
            Enumeration<?> enumeration = p.propertyNames();

            while (enumeration.hasMoreElements())
            {
                String key = (String) enumeration.nextElement();
                String value = p.getProperty(key);

                System.out.println("Key = " + key + " , Value = " + value);
            }

        }
        finally
        {
            if (fileReader != null)
            {
                fileReader.close();
            }
        }
    }
}

Output

Key = user , Value = root 
Key = password , Value = oracle

Click the below link to download the code:
https://sites.google.com/site/ramj2eev1/home/javabasics/PropertiesDemo_propertyNames_App.zip?attredirects=0&d=1

Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/PropertiesDemo_propertyNames_App

Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/fecc858ed896ce9bbf3cb92f5d438fc2de9eee22/BasicJava/PropertiesDemo_propertyNames_App/?at=master

See also:

All JavaEE Viedos Playlist

All JavaEE Viedos

All JAVA EE Links

Servlets Tutorial

All Design Patterns Links

JDBC Tutorial

Java Collection Framework Tutorial

JAVA Tutorial

Kids Tutorial

Java Tutorial: Properties class in java [How to get the default value if the key is not present]

Click here to watch in Youtube :
https://www.youtube.com/watch?v=6Ap2aCqLuNM&list=UUhwKlOVR041tngjerWxVccw

db.properties

Java Tutorial: Properties class in java [How to get the default value if the key is not present]

PropertiesDemo.java

import java.io.FileReader;
import java.io.IOException;
import java.util.Properties;

/*
 * public String getProperty(String key, String
 *                                      defaultValue)
 * 
 * Parameters: 
 * ----------
 * 
 * key - the hashtable key. 
 * 
 * defaultValue - a default value.
 * 
 * Returns: 
 * -------
 * 
 * the value in this property list with the specified
 * key value.
 */

class PropertiesDemo
{

    public static void main(String[] args) throws IOException
    {
        FileReader fileReader = null;
        try
        {
            fileReader = new FileReader("db.properties");

            Properties p = new Properties();
            /*
             * Reads a property list (key and element pairs)
             * from the input character stream in a simple
             * line-oriented format.
             */
            p.load(fileReader);

            /*
             * Searches for the property with the specified
             * key in this property list. If the key is not
             * found in this property list, the default
             * property list, and its defaults, recursively,
             * are then checked. The method returns the
             * default value argument if the property is not
             * found.
             */

            String user = p.getProperty("user", "system");
            String password = p.getProperty("password", "Oracle");

            System.out.println("user = "+user);
            System.out.println("password = "+password);
        }
        finally
        {
            if (fileReader != null)
            {
                fileReader.close();
            }
        }
    }
}

Output

user = root 
password = Oracle

Click the below link to download the code:
https://sites.google.com/site/ramj2eev1/home/javabasics/PropertiesDemo_default_Value_App.zip?attredirects=0&d=1

Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/PropertiesDemo_default_Value_App

Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/fecc858ed896ce9bbf3cb92f5d438fc2de9eee22/BasicJava/PropertiesDemo_default_Value_App/?at=master

See also:

All JavaEE Viedos Playlist

All JavaEE Viedos

All JAVA EE Links

Servlets Tutorial

All Design Patterns Links

JDBC Tutorial

Java Collection Framework Tutorial

JAVA Tutorial

Kids Tutorial

Friday, 24 February 2017

Java Tutorial: Properties class in java | Java properties tutorial - Playlist

Click here to watch in Youtube :
https://www.youtube.com/watch?v=8GU6d2560F4&list=PLmCsXDGbJHdiOJXLVNbOIAH6D1C4M3e92

See also:

All JavaEE Viedos Playlist

All JavaEE Viedos

All JAVA EE Links

Servlets Tutorial

All Design Patterns Links

JDBC Tutorial

Java Collection Framework Tutorial

JAVA Tutorial

Kids Tutorial

Java Tutorial: Properties class in java | Java properties tutorial

Click here to watch in Youtube :
https://www.youtube.com/watch?v=8GU6d2560F4&list=UUhwKlOVR041tngjerWxVccw

Click the below Image to Enlarge

Java Tutorial: Properties class in java | Java properties tutorial

db.properties

Java Tutorial: Properties class in java | Java properties tutorial

PropertiesDemo.java

import java.io.FileReader;
import java.io.IOException;
import java.util.Properties;

/*
 * public String getProperty(String key)
 *
 * Parameters:
 * ----------
 *
 * key - the property key.
 *
 * Returns:
 * -------
 *
 * the value in this property list with the specified
 * key value.
 */
class PropertiesDemo
{

    public static void main(String[] args) throws IOException
    {
        FileReader fileReader = null;
        try
        {
            fileReader = new FileReader("db.properties");

            Properties p = new Properties();
            /*
             * Reads a property list (key and element pairs)
             * from the input character stream in a simple
             * line-oriented format.
             */
            p.load(fileReader);

            /*
             * Searches for the property with the specified
             * key in this property list.
             */
            String user = p.getProperty("user");
            String password = p.getProperty("password");

            System.out.println("user = "+user);
            System.out.println("password = "+password);
        }
        finally
        {
            if (fileReader != null)
            {
                fileReader.close();
            }
        }
    }
}