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Convert List Object to Map Object
How to convert list object in to map object?
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How many methods in the Serializable interface?
There is no method in the Serializable interface. The Serializable interface acts as a marker, telling the object serialization tools that your class is serializable.
Prasad MN
- Dec 17th, 2012
There is no methods in serializable interface. It is a marker interface and null interface.
ram
- Nov 22nd, 2012
Does not have any methods in Serializable interface......
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Given the two methods:
void f() throws IOException
Which of the following is/are correct overriding method?
a) void f() throws IOException
b) public void f()
c) void f() throws FileNotFoundException
d) void f() throws ExceptionimAjit
- Dec 24th, 2012
a) void f() throws ioexception Bcoz the overriding method must NOT throw checked exceptions that are new or broader than those declared by the overridden method. For example, a method that declares a...
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What is the use of having finally?
chaithanya chatla
- Dec 28th, 2012
Finally block having the statements which are releasing the resource, closing the streams, closing the connection and so on. If exception is raised or not but closing the resource are necessary. So we can keep statements inside the finally block those should be get executed compulsory.
Ajit4U
- Dec 24th, 2012
Finally is the block which will be executed irrespective of exception caught in catch block.
Hence it is useful to do any resource releasing/ connection closing after exception handling -
Have you used threads in Servlet
Prasad MN
- Dec 28th, 2012
We can implements SingleThreadModel in Servlets Class.
CodeSandhya.Kishan
- Jul 26th, 2012
Servlets dont run in their own threads. Instead, when a request comes in, the app server removes a thread from a master thread pool and uses it to drive the servlets service method. Once the service method has returned, the thread is returned to the thread pool.
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Which of the following is true about packages?
a) Classes in the same package can access each other.
b) The inherited class should be in the same package as the parent class.
c) Package name a.b implies, package b is inherits from package a.
d) Package access is next to private access in being restrictive. -
Call Main Function Explicitly
Can we call the main function explicitly? If Yes, How?
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Swing provides ________ text components
Skill/Topic: AWT & AppletsA) fourB) SixC) Sixteen D) Thirtytwo
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What is meant by Session, Tell me something about HTTPSession Class
Prasad MN
- Mar 8th, 2013
Session is nothing but a small amount of data that is storing at server side. We can handle sessions in different approaches.
1. HttpSessions
2.Cookies.
3.URL Rewriting.
4.Hidden Form..
Using of HttpSessions we can store the information is server side. Its available to till session expire. -
How have you done validation of the fileds in your project
Prasad MN
- Mar 8th, 2013
Yes.
Using of the validation framework we can do the form validations. Struts provides ready made validation. Using of the validation.xml file we can do the form validation.
Second approaches is using javascript. -
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When to use Interface over abstract class?
Abstract Classes: Classes which cannot be instantiated. This means one cannot make a object of this class or in other way cannot create object by saying ClassAbs abs = new ClassAbs(); where ClassAbs is abstract class.Abstarct classes contains have one or more abstarct methods, ie method body only no implementation.Interfaces: These are same as abstract classes only difference is we an only define...
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Select appropriate answers for the incomplete declaration listed below?
class A ______ B ______ C { } // line 4
a) The 1st blank should be extends and the 2nd blank should be implements.
b) The 1st blank should be implements and the 2nd blank should be extends.
c) B is a class and C is an interface
d) B and C can be either class or interface depending upon the placement of extends or implements in the 1st or 2nd blank. -
Which of the following options can be inserted at the commented line to compile the given code:
cpublic class Class1 {
Class1(String s){ }
Class1() { }
}
class Class2 extends Class1{
Class2(){ }
Class2(String s) {super(s);}
void m1() {
// insert code here
}
}
a) Class1 c1 = new Class1("HCL"){ }
b) Class1 c1 = new Class2(){ };
c) Class2 c3 = new Class1(String s){};
d) Class1 c1 = new Class1(100){ }; -
Thread and Runnable
When we will use thread and runnable in java program ?
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What is the output of below syntax?
java{
cath(Exception e)
{System.out.println("A");
}
cath(ClassNotFoundException e1)
{System.out.println("b");
}
cath(InvalidException e2)
{System.out.println("c");
}
finally()
{
System.out.println("x");
}
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What are the legal operands of the instanceof operator
The left operand is an object reference or null value and the right operand is a class,interface, or array type.
Digpal Singh Chouhan
- Apr 19th, 2013
The left operand is an object reference or null vale
the right operand is a cla,interface,or aaray typeSandhya.Kishan
- Jul 14th, 2012
The legal operands of instance of operator are
1. Left operand which is an object reference.
2. Right operand which can be a class or an interface. -
Which of the following methods are methods of the Math class?
A) absolute( )B) log( )C) cosine( )D) sine( )
veena
- May 25th, 2013
Log()
harshpasrija
- Apr 15th, 2006
All are math functions but the defined name of the functions are not correct. Only correct name is log() hence ans is B
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Which of the following statements correctly describes the relation between an object and the instance variable it stores? (Select multiple)
A) Each new object has its own distinctive set of instance variablesB) Each object has a copy of the instance variables of its classC) the instance variable of each object are seperate from the variables of other objectsD) The instance variables of each object are stored together with the variables of other objects
Java Interview Questions
Ans