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Programming Language

Packages

 1. A.java package mypack ; import pack .*; public class B {     public static void main ( String [] args ) {         A obj = new A ();         obj . show ();     }     }   c B.java package pack ; public class A {     public void show ()     {         System . out . println ( "welcome to java" );     }     } 2:- package pack ; public class A {     public void show ()     {         System . out . println ( "welcome to java" );     }     } package mypack ; import pack . A ; public class B {     public static void main ( String [] args ) {         A obj = new A ();         obj . show ();     }     } program :-3 B.java package mypack ; public class B {     public static void ma...
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Multithreading error program

  1:- class Demo   extends Thread {   public void run () { System . out . println ( "thread task" ); } public static void main ( String [] args ) { Demo t = new Demo (); t . start (); t.start();//isme error aya isliya ki start method 2 bar create kar diya hai isliya ham start method do bar create nahi kar sakte hai } } C : \java>javac Testing . java C : \java>java Demo thread task Exception in thread "main" java . lang . IllegalThreadStateException         at java . lang . Thread . start ( Thread . java : 708 )         at Demo . main ( Testing . java : 12 ) C : \java> 2:-   class Demo implements Runnable { public void run () {     System . out . println ( "MULTITHREADING" );     } public void run() {     System.out.println("MULTITHREADING"); //ya pe run methoid ko overload nahi kar sakte hai     } public static void main ( String args []) { Demo t = new D...
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Multithreading program in java

Two way se create hota hai thread class 1:-    First ways class Demo   extends Thread {   public void run() { System.out.println( "thread task"); } public static void main ( String [] args ) { Demo t = new Demo (); t.start(); // ayse program likhege to thread create ho jayega } } C : \java>javac Testing . java C : \java>java Demo thread task C : \java> 2:- or class Demo   extends Thread {   public void run() { System.out.println( "thread task"); } public static void main ( String [] args ) { Demo t = new Demo (); t.run(); //is program me simple ek method create hua a } } C : \java>javac Testing . java C : \java>java Demo thread task C : \java> 3:-     Second Way class Demo   implements Runnable {   public void run () { System . out . println ( "thread task 2" ); } public static void main ( String [] args ) { Demo t = new Demo ();   Thread th = new Thread (t); th . start (); }...
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Multithreading Basic program

  Multithreading  program in  java Multithreading error program 1:- class Demo implements Runnable { public void run () {     } public static void main ( String args []) { Demo t = new Demo (); Thread   th = new Thread (t); th . start (); } } C : \java>javac Testing . java C : \java>java Demo C : \java> 2:-   class Demo implements Runnable { public void run () {     System . out . println ( "MULTITHREADING" );     } public static void main ( String args []) { Demo t = new Demo (); Thread   th = new Thread (t); th . start (); } } C : \java>javac Testing . java C : \java>java Demo MULTITHREADING C : \java> 3:  -   1.Performing single task from single Thread. //1.Performing single task from single Thread. class Demo extends Thread { public void run() { System.out.println("thread task"); } public static void main ( String [] args ){ Demo t= new Demo(); t.start(); } } C...
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java Networking

 1. import java.net ; class Demo { public static void main ( String args []){ URL obj = new URL ( "https://www.javatpoint.com/" ); System . out . println ( obj . getptotocol ()); System . out . println ( obj . getHost ()); System . out . println ( obj . getPort ()); System . out . println ( obj . getFile ()); } } 2:- import java net * ; class Demo { public static void main ( String args []) throws Exception { InletAddress ip = InletAddress . getBYName ( "https://www.javatpoint.com/java-networking" ); System . out . println ( ip . gerHostName ()); System . out . println ( ip . gerHostAddress ()); } }                                                                              ...
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