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What do you mean by static methods?
By using the static method there is no need creating an object of that class to use that method. We can directly call that method on that class. For example, say class A has static function f(), then we can call f() function as A.f(). There is no need of creating an object of class A.
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What are the disadvantages of using threads?
DeadLock.
Sandhya.Kishan
- May 22nd, 2012
The disadvantage of thread is that in may result in the starvation because of race conditions and deadlocks.
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What class allows you to read objects directly from a stream?
The ObjectInputStream class supports the reading of objects from input streams.
Sandhya.Kishan
- Jul 24th, 2012
The class that allows to read objects directly from a stream is the Objectinputstream class.
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How are this() and super() used with constructors?
This() is used to invoke a constructor of the same class. super() is used to invoke a superclass constructor.
sujatham
- Jul 31st, 2007
This() is used to invoke current object constructor.super() is used to invoke super class constructor.
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How is it possible for two String objects with identical values not to be equal under the == operator?
The == operator compares two objects to determine if they are the same object in memory. It is possible for two String objects to have the same value, but located indifferent areas of memory.
lwpro2
- Mar 13th, 2011
Normally, when define a string instance, if using, String s = "ABC"; the existing string variable at the string pool is returned. However, if using new String("ABC") there is always one additional Str...
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How to kill a thread?
Sandhya.Kishan
- Jun 19th, 2012
The Thread.stop() method can be used to kill a thread but it is unsafe and thus deprecated.
Other way would be to have a variable indicating if the thread should be stopped. Other threads may set the variable to make the thread stop. Then, the thread itself may clean up and stop. -
How will u make transactions with creditcard? I.e., will u deduct money from the card Immediately after making transaction?
ACE_GEEK
- Jul 22nd, 2008
Actually Credit card transactions are not instant. The transactions generate a what is called as Auth code (authorization code) which entitles you to get the money and at the same time the money is bl...
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How will u insert and delete with a single java connection when u have referential integrity?
raghu.emails
- Mar 6th, 2009
You can do both operations with a single Java connection but you need two?seperate statements to execute queries or use stored procedures to execute both queries.
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How will u achieve threads?
ACE_GEEK
- Jul 22nd, 2008
If your question was how to create threads, you can do it by 2 methods.1. You can extend the Thread class2. You can implement the Runnable interface.
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How can u implement hashmap if u r not having it in java?
santoshbwn
- May 10th, 2008
class container{//put the setters and getters of key and valuesobject key=null; //acting as keyList values=null;public void Container(){key=new Object();values=new ArrayList();}public insert(object ke...
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If service method is used then doGet() and doPost() stand for what?
Sandhya.Kishan
- Jun 19th, 2012
We use doGet() when you want to intercept on HTTP GET requests.The servlet doGet() is used to preprocess a request.Ex:doing some business stuff before displaying the JSP page, such as gathering data f...
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Can u read all elements from an array?
Sandhya.Kishan
- Jun 19th, 2012
Reading elements from an array depends on the type of data that we want to read from an array,if the array is a linked list or stack or a queue it is not possible to read all the elements but if the array is fo a prmitive data typr then it is possible to read all the elements,
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What is a layered pane?
Sandhya.Kishan
- May 16th, 2012
LayeredPane is a container which allows switching between different sets of displayed components. Each set of components, called a page, is declared within the LayeredPane component and its possible t...
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Java Interview Questions
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