Techno Mindz

instanceof operator is also known as type comparison operator. It compares an object with any specific type(may be class, interface etc.). It returns either true or false.
It is used to test whether given object is an instance of specified class or not.

Example :

class Test{
public static void main(String args[]){
Test t=new Test();
System.out.println(t instanceof Test ) ;

}

Output :
true

In the last post we learned some basic operators. Apart from these operators, there are some other operators we need to know about.

In this post post, we will learn Ternary operator.


Ternary operator(?:) : 
                                   This operator is also called conditional operator. It   contains three operands and is used to evaluate boolean expressions. Goal of this operator is to decide which value should be assigned to variable.
Syntax :
 Variable v=(expression) ? value if true : value if false ;                                                                               
Example : 



Output : 

Value of y : 15
Value of y : 10

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Java operators                                                                 instanceof operator

                                                                                                               
JVM- jvm(java virtual machine) is a specification which does the following
         works.

1 . Loads code.
2 . Verifies code.
3 . Executes code.
4 . Provides Runtime environment in which byte code gets executed.



JVM internal architecture






JRE - jre acronym for java runtime environment  is an implementation of
         JVM. It contains set of libraries and other files that JVM uses at runtime.
         We can say JVM is a part of JRE.

     



JDK - JDK is the java development kit which contains development tools and
         JRE.




JVM, JRE and JDK all are platform dependent.

                                                                                             Next topic
                                                                                             Unicode system

                                                                                                                           

When network change is detected whether it is wifi to mobile network or mobile network to wifi, the IP address allocated to device is changed.

1 . If network changes from wifi to mobile data then you can find the new IP 
     address allocated to device by writing the following code

try {
    for (Enumeration<NetworkInterface> enumeration = NetworkInterface.getNetworkInterfaces();

 enumeration.hasMoreElements();) 
    {
        NetworkInterface nInterface = enumeration.nextElement();
        for (Enumeration<InetAddress> enumIpAddresses = nInterface.getInetAddresses(); 
             enumIpAddresses.hasMoreElements();) 
        {
            InetAddress inetAddress = enumIpAddresses.nextElement();
            if (!inetAddress.isLoopbackAddress()) 
            {
                return inetAddress.getHostAddress().toString();
            }
        }
    }
} catch (Exception ex) {
      ex.printStackTrace();
}

2 . If network changes from mobile data to wifi then you can find the new IP
     address allocated to device by writing  the following code.

WifiManager wifiManager=(WifiManager)context.getSystemService(Context.WIFI_SERVICE);
String ipAddress=Formatter.formatIpAddress(wifiManager.getConnectionInfo().getIpAddress());