abson - Developer IT

Local variables and instance variables

- by abson

Why is it that instance variables are initialised to default values while local variables aren't?

mobile devices operating systems

- by abson

what are the operating systems which run on mobile devices?On which language are these developed?

Static methods and their overriding

Java doesn't allow overriding of static methods but, class stat13 { static void show() { System.out.println("Static in base"); } public static void main(String[] ar) { new next().show(); } } class next extends stat13 { static void show() { System.out.println("Static in derived"); } } is not overriding done here?

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gearman - what is it

- by abson

What is gearman and where and in what is it used?

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Decompiling Java class files

- by abson

Can one decompile .class files to source code in java?

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Why there is no multiple inheritance in Java, but implementing multiple interfaces is allowed

- by abson

Java doesn't allow multiple inheritance but it allows implementing multiple interfaces. Why?

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java servlet programming errror

- by abson

C:\Tomcat5.5\webapps\WEB-INF\classes>javac MyServlet.java MyServlet.java:2: package javax.servlet does not exist import javax.servlet.*; ^ MyServlet.java:3: package javax.servlet.http does not exist import javax.servlet.http.*; ^ MyServlet.java:5: cannot find symbol symbol: class HttpServlet public class MyServlet extends HttpServlet ^ MyServlet.java:7: cannot find symbol symbol : class HttpServletRequest location: class MyServlet public void doGet(HttpServletRequest req, HttpServletResponse res) throws Serv letException,IOException ^ MyServlet.java:7: cannot find symbol symbol : class HttpServletResponse location: class MyServlet public void doGet(HttpServletRequest req, HttpServletResponse res) throws Serv letException,IOException ^ MyServlet.java:7: cannot find symbol symbol : class ServletException location: class MyServlet public void doGet(HttpServletRequest req, HttpServletResponse res) throws Serv letException,IOException ^ 6 errors

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finally in exception handling

- by abson

What exactly does a finally block in exception handling perform?

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java based programming challenges

- by abson

Is there any website which provides core java based programming challenges that tests programming logic?

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scjp certification future validity

- by abson

Is this the right time to go for a scjp certification?With Oracle being the authority won't SCJP lose its value as and when OCJP gets announced instead of the former? my worry is will one be able to go for the next level like SCWCD?

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minimum requirements for a developer

- by abson

What are minimum requirements for a beginner to gain a java based development job as on date?What is the same in the case of a .NET framework based development job? Which path would be a better option today?

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Lost String garbage collection

- by abson

Lost String objects are memory wasters is it? How can garbage collection be invoked for the same?

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foreach loop a java creation?

- by abson

Why was this loop introduced in java?Is it a java creation? What is its purpose(increases memory/cpu utilisation efficiency)?

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interfaces in java

- by abson

Java doesn't allow multiple inheritance but it allows implementing multiple interfaces. Why?

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getClass method in java

- by abson

How is it that the getClass method in Object class is capable of dynamically returning Classname?

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Unreachable statement when using return in finally?

- by abson

this compiles class ex1 { public int show() { try { int a=10/10; return 10; } catch(ArithmeticException e) { System.out.println(e); } finally { System.out.println("Finally"); } System.out.println("hello"); return 20; } } on the other hand this doesn't class ex15 { public int show() { try { int a=10/0; return 10; } catch(ArithmeticException e) { System.out.println(e); } finally { System.out.println("Finally"); return 40; } System.out.println("hello"); return 20; } } and gives unreachable statement System.out.println("hello"); error. why is it so?

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java and dot net

- by abson

Why is it that java based openings are mostly accompanied with some sort of experience requirements while the same is not with dot net?

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dot length in java

- by abson

In which class the length variable exist in java(one used for printing array length)?

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java source code doubt

- by abson

this compiles class ex1 { public int show() { try { int a=10/10; return 10;} catch(ArithmeticException e) { System.out.println(e); } finally { System.out.println("Finally");} System.out.println("hello"); return 20; } } on the other hand this doesn't class ex15 { public int show() { try { int a=10/0; return 10;} catch(ArithmeticException e) { System.out.println(e); } finally { System.out.println("Finally"); return 40;} System.out.println("hello"); return 20; } } why is it so?

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java connectivity with mysql error

- by abson

I just started with the connectivity and tried this example. I have installed the necessary softwares. Also copied the jar file into the /ext folder.Yet the code below has the following error import java.sql.*; public class Jdbc00 { public static void main(String args[]){ try { Statement stmt; Class.forName("com.mysql.jdbc.Driver"); String url = "jdbc:mysql://localhost:3306/mysql" DriverManager.getConnection(url,"root", "root"); //Display URL and connection information System.out.println("URL: " + url); System.out.println("Connection: " + con); //Get a Statement object stmt = con.createStatement(); //Create the new database stmt.executeUpdate( "CREATE DATABASE JunkDB"); stmt.executeUpdate( "GRANT SELECT,INSERT,UPDATE,DELETE," + "CREATE,DROP " + "ON JunkDB.* TO 'auser'@'localhost' " + "IDENTIFIED BY 'drowssap';"); con.close(); }catch( Exception e ) { e.printStackTrace(); }//end catch }//end main }//end class Jdbc00 But it gave the following error D:\Java12\Explore>java Jdbc00 java.lang.ClassNotFoundException: com.mysql.jdbc.Driver at java.net.URLClassLoader$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Unknown Source) at Jdbc11.main(Jdbc00.java:11) Could anyone please guide me in correcting this?