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1. Can You catch the Error? 2. Difference between compiletime exception and runtime exception?3. How you throw user defined exception?4. How you handle throwable while using exceptions ?5. What are the methods available in Object ?6. Is there any methods available in serialization ?7. How you seralize an Object ?8.How you get the serialized object ? 9. Any methods available in deseralization ?
rammaheswara
- Sep 29th, 2009
Yes, you can catch the Error as it is a subclass of Throwable, but you are not supposed to.For most of the errors like ( out of memry), there is no use of catching the error.MAHES
ambuj
- Jun 28th, 2007
No, because error is not related to ur progamming envirnment through which we can apply our exception handling mecanism. It?occurs only due to operating system failure, System virus affected etc.
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Compare String object with StringBuffer object.
divya_mini4u
- Sep 22nd, 2010
String objects are immutable in the sense once created cannot be changed, whereas StringBuffer object is mutable and can be changed i.e it saves memory space
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Can i expand an interface?
sriharshanamala
- Mar 1st, 2008
Yaa sure an interface can extend another interfacebut it can not implement another interface..
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Marker interface having no methods right.. then what is the use of marker interface? for what purpose we use marker interface?
Ravi.Hingarajiya
- Aug 27th, 2009
It is used to identify class. In the read project, there are so many classes. It can identify that which class belongs to which module Exmaple : Cloneable interface can be cloned. The Java compi...
amitabh26d
- Aug 26th, 2009
Marked interfaces is for compiler use and we need not have to worry about its implementation.? Yes it does not have any methods, it is because by implementing marked interfaces we are telling a compiler?that it can optimise this class as per the specification of Java for that interfaces.
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Which one is faster interms of accessing, interface or abstract class?
narendra
- Jul 28th, 2011
No, Suppose both have abstract method then ?
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How to call a static block in one class from another class?. And is it possible to call a free floating block in one class from another class?. How?
vinaymudgil007
- Jun 11th, 2008
static block gets executed whenever is class is loaded by the JVMso what you can do is.....write is class having static block in it ---> compile it --> write another class (ensure that fir...
NavaNani
- Apr 7th, 2008
Non static blocks & Static blocks are executed one by one by the order of their defintion before any constructor is being executed.Static blocks can also be invoked without creating instance ...
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What is the use of Empty Interface?
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ToString function
What is the default value for toString() in java? Explain me with an example?
sivapurammani
- Jul 10th, 2013
Default value is String representation of any Object. "java class Student { int rollNo; String name; public Student(int rollNo, String name){ this.rollNo = rollNo; this.name = n...
Nikhil
- Feb 21st, 2013
If toString() method is not overriden, it will return
public String toString() {
return getClass().getName() + "@" + Integer.toHexString(hashCode());
}
This is Object version of this method. -
How we can create marker interface in java?
trinadh
- Mar 19th, 2008
We can create it by having no method defenitions on out own interface .u first extend Serializable interface to ur Apple interface and after that what ever class implements ur Apple interface will be Serializable OK
sampra
- Mar 11th, 2008
To inform to JVM that the objectedt created for particular class will be follw this property
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How would you declare a SingleThreaded servlet
mayur
- Aug 15th, 2007
We can put the code in the servlet in a synchronized block with a static member as a monitor.
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How does garbage collection work
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Is it advisable to depend on finalize for all cleanups
archikinu
- Oct 2nd, 2007
No it is not advisable to depend on finalize, because we cannot know when -- or even if -- finalize will be executed.
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How can we take various inputs from user as int,char,string,float etc ?
dinesh
- Oct 12th, 2011
Example we get input for integer,
Scanner scan = new Scanner(System.in);
int variable_name = scan.nextInt();geeksterrahul
- Jul 25th, 2009
Firstly take the User input as String using the BufferedReader API.Call br.readLine();Once you get the input Use .ValueOf method for conversion. Eg: String MyString; Buffere...
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Please give me answer why we use Interface though it contain only blank implementation.
muralidhar.9e
- Sep 20th, 2010
An Interface may Contain implementation or not. Sometimes these type of interfaces (blank interfaces) which are not implemented are called as "marker interfaces".
nikhil_52001
- Sep 19th, 2010
The purpose of Marker interface is to just let the compiler know that the clas which implements the Marker Interface will be serialized or cloned. Ther is not any other use of Marker Interface. E.g If...
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What is daemon threads?
Srinivas Kallumadi
- Nov 4th, 2005
Any Java thread can be a daemon thread. Daemon threads are service providers for other threads running in the same process as the daemon thread. For example, the HotJava browser uses up to four daemon...
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If we have two public classes in a single java file ,how i have to give the name of the particular java file and how i can compile it?
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Which is superclass of Exception?many people think that object,no there is particular class which is superclass of all exception it starts with letter B,plz tell me
nv_krishna
- May 19th, 2008
The super class of all Exceptions in java is Throwable. It has two sub-classes :: Exception and ErrorException forms the base class for Exceptions like ArrayIndexOutofBounds etc..Error is another sub-class, these are catastrophic in nature and not caught by normal java program..
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What happens if we execute the program?class Return{ int display(){ try{ return 1; } finally{ return 2; }}public static void main(String args[]){ Return r=new Return(); r.display();}}when i executed i got the compile time error when i executed on jdk 1.4?but in khalid moghal book its executed and result is printed.
Pallu
- Sep 5th, 2006
You are right Sandeep.But I guess, Sadashivrao did not set a classpath if he is executing this program on command prompt.You can set classpath by:(if u saved Return.java in temp folder)C:Documents and Settingsx.yDesktoptemp>set classpath=%classpath%;C:Documents and Settingsx.yDesktoptemp
Core Java Interview Questions
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