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Class A { void add(); } class B { void add();}class Ex {public static void main(string args[]) {A a=new B();B b=new A();a.add();b.add();}What is the result;
agsuvidha
- Aug 14th, 2007
There is an error in this program. as if u see clearly, class A is an abstract class and abstract class can not be instantiated.
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There is a class in which it has 3 variables: static int ii; transient int j; int k; if we create an object for the above class which is serializable then what are the variables available in the object?
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Differences and usage senarios of synchronised method and synchronised block ?
hemasundar
- Jan 2nd, 2008
We use synchronized methods or synchronised blocks to?make your application thread safe.?You can use synchronized methods, but the problems may be:1. It degrades the performance of your application....
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How to create a Tabbed Pane in JSP page?
nauityal
- Dec 24th, 2007
//declareprivate JTabbedPane pane ; //initialisepane = new JTabbedPane(); //add GUI components to the TABPANEpane.addTab(nameoftab, component);
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Which one of the following is a limitation of sub classing the Thread class?
Choice 1 It cannot have any static methods in the class. Choice 2 It must declare the class final. Choice 3 It cannot subclass any other class. Choice 4 It must implement the Threadable interface. Choice 5 It must catch the ThreadDeath exception
anithananduri
- Apr 10th, 2009
Choice 3 It cannot subclass any other class. because java supports multiple inheritance with interfaces not with classesChoice 4 It must implement the Threadable interface. another way of creati...
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What is the difference between normal validations (validator.xml) and struts validations?
sree2880
- Oct 6th, 2007
difference in validator.xml and dyna validator is:validator.xml :In this we have to set the bean like"examplebean.java" where as in dynavalidator or struts validations we assign t...
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What is the use of assertion?
dear_srik
- Oct 27th, 2007
Assertions are kind of mechanisms in java from 1.4 onwards, where assert is a keyword. By using assertions you can validate your assumptions. Assertions should be only used to validate certain assumpt...
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Why applets can run without main() method?
B'coz they can run with the help of different browsers...
anithananduri
- Apr 10th, 2009
Applet program is executed by the browser not using the Java command, so main method is useless.
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What is wrong in the following code?pulic synchronized void setXXX(String s){ this.setXXX(s);}public synchronized String getXXX(){...}orpulic synchronized void setXXX(String s){ return (this.getXXX());}
GEEK_ALOK
- Jan 15th, 2008
There is a return statement in the set() method because return type of this method is void.............
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How do you add two numbers using bitwise operators ?
leena singhal
- Jun 16th, 2008
We can add 2 numbers using xor operator but it will not handle carry therefore, we first use and operator on those 2 numbers n den take a xor of dem ...shift d res of and by 1 bit and den wil xor again the res of shift with d prev xor res....until carry=0i thnk it will work
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What is the difference between final, finally and finalize?
shaik subhani
- Dec 26th, 2007
final is a keyword used to declare constants. finally block is used in an exception handling.whether there is an exception or not in try block in , finally block will be executed.we used to provide th...
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How do you track Ip in Java ?
ravi_1229
- Mar 24th, 2008
try this piece of code: java.net.InetAddress remoteInetAddress = java.net.InetAddress.getByName(request.getRemoteHost()); String client=remoteInetAddress.getHostName(); System.out.print(client);
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Java Reflection
What is reflection and its use in java?
nkamuni
- Dec 19th, 2007
Reflection is commonly used by programs which require the ability to examine or modify the runtime behavior of applications running in the Java virtual machine. This is a relatively advanced feature a...
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How to retrieve email ids from distribution list?
We have a small requirement where we need to retrieve the e-mail ids of all the employees in the distributed list using LDAP, can any one give an idea how it can be done?
aravind.pk
- Jan 31st, 2008
Hey did you got answer for your query? i too is in requirement of answer for your query.infact, my requirement is "how to access and display the contacts in a distribution list using java?"
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Immutable Strings Object
How String object is immutable and why?
ramnath_19
- Jan 3rd, 2008
Ur question can be answered with an example : String s = "here it goes";s.toUppercase(); This does not modify the variable s at all. Instead, a new String object is created with all the cha...
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What is the difference between exit(o) and exit(1) in Java?
ravi_1229
- Mar 24th, 2008
The number is only the status code for the termination of the JVM. It does not effect the actual command. By convention 0 means a normal exit, any other number is an abnormal termination.
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What is the difference between JDK1.4 and JDK1.5
prawintowin
- Mar 26th, 2008
In JDK 1.5 there are many new IO classes, enhanced for loop, autoboxing (i.e., we can directly use the Wrapper classes are primitive data types.) For example,Integer a = 10; where as in JDK 1.4 it is not possible. These are the main differences.Hope I have answered your question.
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JIT Compiler and Interpretor in JVM
In Java JVM we have both JIT compiler and interpretor What are the functionalities of both?
Aravinda Rao
- Mar 31st, 2008
Both JIT compiler and Interpretor are used to convert Virtual Machine(VM) instructins into native machine code and VM use this code for Execution.Running the JIT compiled code is...
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