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Is is true that JAVA is not 100% object oriented language ?
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Memory Allocation
What is the difference between below 2 statements?
String s1=new String("abc");String s2="abc";How it will allocate in memory?gaurav
- Jun 15th, 2012
in String s1 = "Hello World"; // "Hello world" is a constant and it will be allocated in the string pool. all the variables refering to "Hello World" constant will refer to same memory location in th...
sampra
- Mar 13th, 2012
String s1=new String("abc");- creates 2 obj one in jvm and one in pool.
String s2="abc"; no obj will create it will point to pool above already created existing obj -
If there are multiple If-else, what is the alternative algorthim we can use apart from using switch?
Prashant Shingne
- Sep 9th, 2016
We can use OOPS Concept run-time binding to call expected functionality. No need of if clause, provided everything is represented in objects.
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}
}
The result wil be 5..!! and not 6 why???">Solve it... public class test {public static void main(String[] args) { int i=5; i=i++; System.out.println("result::"+i); }}The result wil be 5..!! and not 6 why???
tarazan2jungle
- May 7th, 2008
Dear Friend, this is post increment, that is first assign the value and then increment.so in this case you first assign the value, so i become 5, now you increment which is of no use.that's why the answer is 5;But rather assigning a value if you directly write i++, then the value become 6;
for4me
- May 4th, 2008
It is same as System.out.println(i++);public class test{public static void main(String[] args) ??? {??? ??? int i=5; ??? ??? System.out.println("result::"+i++); ??? }}It prints 5? first then increments.
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Why we can not override static method?
Manjunath_7_89
- Mar 25th, 2016
Static methods cannot be overridden because method overriding only occurs in the context of dynamic (i.e. runtime) lookup of methods. Static methods (by their name) are looked up statically (i.e. at c...
Ramesh
- Feb 4th, 2016
If a subclass defines a class method with the same signature as a class method in the superclass, the method in the subclass hides the one in the superclass. You didn't override the method a(), because static methods are not inherited. If you had put @Override, you would have seen an error.
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More than One Class
If more than one class is present in one Java file then what will be the java file name?
zshekhtm
- Dec 10th, 2010
You can have more than one class in the same Java source file but only one class can be public in any source file and its name should correspond to the name of a source file. This public class should have main() implemented.
annmary
- Dec 8th, 2010
If a file contain more than one class, the name that file will be the name same as the class which is declared as public. It is not mandatory.
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Synchronization in Java
When We should use Synchronization in Java and when we should not?
sivapurammani
- Dec 16th, 2013
In simple terms we can say only one thread can act on selected resource(method or variable). Understanding the above sentence is as follows:: For example we are booking any ticket in a particular bu...
Yeswanth
- Dec 6th, 2013
If you want to allow only one thread at a time to access block of code or method then we will go for synchronization.
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How do you declare constant values in java
rohitrichhariya
- Jul 23rd, 2010
For declaring constant in Java, Java gives us 3 suggestion.1. Declare constant variable as a final.2. Also constant variable declare as a final.3. All the letter of constant variable is capital....
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Overriding Methods
Suppose a Super Class method throws an exception and this method is Overriden in the subclass with no exception. Now if you create a super class reference that has a subclass object. This throws a compile time error, Why?
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Editorial / Best Answer
bharathnav- Member Since Oct-2008 | Oct 13th, 2008
"Suppose a Super Class method throws an exception and this method is Overriden in the subclass with no exception. Now if you create a super class reference that has a subclass object. This throws a compileLatest Answer: Because at run time, the super class will compiled first, so it will gives the run time error. ..."
if the object has been created to the subclass and both the methods are non static then the method we overriden doesn't produce any errors or exceptions.sampra
- Mar 6th, 2012
If the object has been created to the subclass and both the methods are non static then the method we overriden doesnt produce any errors or exceptions.
techbuz
- Dec 23rd, 2011
throws exception in super class doesnt affest over-riding:code eg as follows: "java public class Ride{ void clay(){ System.out.println("am in base class"); } public static voi...
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If there are more than one main method in a program, then which main method will be called.
what will be the output
class A
{
public static void main(String args[])
{
System.out.println("Hi friend");
}
}
class Test
{
public static void main(String args[])
{
System.out.println(" How are you");
}
}
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What are the differences between C++ and Java
meSubhadip
- Jul 20th, 2009
The main differences are:?Java does not support typedefs, defines, or a preprocessorJava supports classes, but does not support structures or unionsJava does not support multiple inheritanceJava does...
lalitsonawane27
- Feb 7th, 2009
C++ is not a platform independent language while Java is platform independent language.
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Does JVM maintain a cache by itself? Does the JVM allocate objects in heap? Is this the OS heap or the heap maintained by the JVM? Why
ch.ramachandrakumar
- Nov 16th, 2007
Whenever the object is created by the JVM, the object is allocated in the free?space called heap. The object reference placed in the frame, which is?the smallest part in the stack. (stack is built up?of many smallest frames). (frame is the smallest memory in the stack).
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What happens if public static void main(){} is made protected?
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Editorial / Best Answer
Answered by: Sushil Jain
- Nov 21st, 2007
You will be able to compile but it will through a run time error saying "main method not public".
AA
- Apr 22nd, 2012
It will compile but gives error at run time......
divya_mini4u
- Sep 21st, 2010
The complier will throw error that there is no main()? method. main() should be public always please note.
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Find the Output
class A{ public static void main(String[] a){ System.out.print(String.valueOf(1)+String.valueOf(2)); String s1="s1"; String s2=s1.toString(); System.out.print(","+(s1==s2)); }}
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What are the differences between EJB and Java beans
naresh17201
- Jul 14th, 2010
1. Java beans live in a single local JVM (address spaces) and can be either visual or non-visualEJB are non-visual distributable components, which can live across multiple JVMs2. Java beans designed t...
aleemkh
- Jul 30th, 2008
JavaBeans are just regular class files. They have get and set methods only. They are not controlled by separate EJB server like JBOSS etc, They can easily work on JVM itself and they dont require any ...
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How are memory leaks possible in Java
sampra
- Mar 13th, 2012
When we have object in momory and that object is not gets called at runtime.this is memory leckage
bikash
- Jul 20th, 2011
Improper handling of pointers leads to memory leaks and reliability issues.
Core Java Interview Questions
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Ans