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String b=new String("A");
String c="A";
String d="A";
Then which of the following returns true?
1. if(a==b)
2. if(b==c)
3. if(c==d)
4. if(d==a)">String a=new String("A");String b=new String("A");String c="A";String d="A";Then which of the following returns true?1. if(a==b)2. if(b==c)3. if(c==d)4. if(d==a)
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What is the size of Interger wrapper class?
ramesh chandra
- Jan 2nd, 2007
hi size of integer wrapper class will be find out using size of opreator by passing the object or instance of the class as a parameter
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When we have to use FileInputStream() or FileReader()?
Thiyagarajan.N
- Mar 20th, 2007
FileInputStream is used to read the file byte by bytes. FileReader is used to read the file character by character.
sivanesh.a
- Dec 24th, 2006
FileInputStream: reading data as stream.FileReader: reading data as binary
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Does Java have pass by value or pass by reference or both?Please Explain it with example.
Casttro
- Mar 15th, 2007
Java is defined in both "pass by value" and "pass by ref" . In pass by value technique is just a copy of aurguments are passed to the method ( EX: cal(20,5.225) and in pass by ref technique is just a ref to the values are passed to the method (EX:cal(Cat, Dog))
ajaykjha
- Oct 15th, 2006
Java has both pass by value and pass by ref. When primitive types are passed, they are passed by value but when objects are passed, they are passed by ref. And reference itself is passed by value.
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What is full form of 'J2SDK' in Java
Feroz Majid Shah
- Oct 7th, 2006
Java Standard Development Kit
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We know that when execution of java starts, 1 st public static void main(String args[]) methodis execute. so i have ask you that ,when main method is executed, it s static method. so at the time of execution of main method, object is not their. after that code under main method is run which contain object of classes.so Q. when main method is executed,at that time object is not in memory so at that time can i say that JAVA IS NOT OBJECT-ORIENTED???
ACCORDING TO ME yes,after main methode,code run which will create object after main method, java is OBJECT ORIENTED.
byteTech
- Jan 9th, 2007
Main() method is the place from where the the JVM starts executing the code within a particular class, there has got to be some point and in this case its the main() method. It does not make Java one wee bit obj oriented
sivanesh.a
- Dec 4th, 2006
Main function is static. so no object required....since main() is inside a class it is purely object oriented.
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When object is created in Java. Is it during compile time or run time?
Keshav v. devale
- Sep 1st, 2014
Array of object created on run time?
Because user assigned values by runtime
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Primitive Types
What happens when you add a primitive type (e.g. double) value to a collection?
pdureja
- Apr 6th, 2011
Collection can hold Objects but not primitives. Prior to Java5, we need to wrap primitive using wrapper classes and in java 5 autoboxing do it automatically.Prior to java 5:xyzCollection.add(new Integer(10))In javaxyzCollection.add(10) //will do autoboxing
mani.sivapuram
- Mar 11th, 2011
Every one says that every concept in Java is purely prepared in Object Oriented Form only in you need to remember one thing when Java people preparing the Java they try to create an alter native t...
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What is the preferred size of a component
The preferred size of a component is the minimum component size that will allow thecomponent to display normally.
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What method is used to specify a container's layout
The setLayout() method is used to specify a container's layout.
Dharmendra Barad
- Mar 26th, 2016
Void setLayout(LayoutManager layoutObj)
Sandhya.Kishan
- Jul 13th, 2012
The method is used to specify a containers layout is setlayout() method.
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What state does a thread enter when it terminates its processing
When a thread terminates its processing, it enters the dead state.
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What is the Collections API
The Collections API is a set of classes and interfaces that support operations oncollections of objects.
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What is the Vector class
The Vector class provides the capability to implement a growable array of objects
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25. Is sizeof a keyword
The sizeof operator is not a keyword.
sarada
- May 3rd, 2007
Unlike C++ sizeof is not a keyword in java.
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Can an object's finalize() method be invoked while it is reachable
An object's finalize() method cannot be invoked by the garbage collector while the objectis still reachable. However, an object's finalize() method may be invoked by otherobjects.
rin.amaru
- Jun 5th, 2008
No , because finalize() method is being invoked just before the garbage collection and an object can not be garbage collected unless there is any live reference of that object i.e that object is reachable.
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What class is the top of the AWT event hierarchy
The java.awt.AWTEvent class is the highest-level class in the AWT event-classhierarchy.
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When a thread is created and started, what is its initial state
A thread is in the ready state after it has been created and started.
rooma singh
- Sep 9th, 2010
Thread is a process which is call by some component eg in web development, container creates a thread (of service() function) and initialised it by giving appropreate input or arguments.
muralidhar.9e
- Sep 8th, 2010
A thread always having some states after creating.They are:NewRunnableRunningBlockedDeadCreating a thread using New keyword a new thread will create.After it started to run at that movement a th...
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What is the argument type of a program's main() method
A program's main() method takes an argument of the String[] type.
srinugrandhi
- May 14th, 2009
In C and?C++, main() function can take the arguments with type int and char as shown below.void main(int argc,char *argv)In Java main() function take the arguments in String type and the above type is also allowed.
vegetto
- Jun 16th, 2008
you write public static void main(String args[])so the argument type isstring and whatever input you give asjava abs "asd" 1then all the 3 arguments are stored int he corresponding string fo...
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What is the purpose of the wait(), notify(), and notifyAll() methods
The wait(),notify(), and notifyAll() methods are used to provide an efficient way forthreads to wait for a shared resource. When a thread executes an object's wait() method, itenters the waiting state. It only enters the ready state after another thread invokes theobject's notify() or notifyAll() methods..
jimmy514in
- Jul 5th, 2010
this is how signalling between threads works using 'wait and notify':We can call the wait() method of any Java object, which suspends the current thread. The thread is said to be &qu...
saranath
- Mar 23rd, 2008
wait() will move the thread to sleep state allowing for the other thread to execute. notify() will trigger back the wait() thread to ready state and to execute further. notifyAll() will trigger all wa...
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What modifiers may be used with an interface declaration
An interface may be declared as public or abstract.
Aarti Suryawanshi
- May 20th, 2017
Public or abstract and from JDK 1.8, you may have default and static methods in an Interface.
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