Interview Questions and Answers - Order By Newest Q911. What are different ways for Servlet authentication ? Java EE
Ans. HTTP Basic Authentication Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Q912. Is it mandatory to have a default constructor ? Core Java
Ans. No. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Asked in 1 Companies Q913. Which environment variables do we need to set in order to run Java programs? Core Java
Ans. PATH, CLASSPATH and JAVA_HOME Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Asked in 3 Companies basic frequent Q914. Can an application have multiple main methods within different classes ? If yes, How will the app decide which one to be executed ? Core Java
Ans. Yes we can have a main method with string[] argument in every class of an application. When we execute an app we specify the starting point i.e the class that will get the control first and hence main method of that class gets executed. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Asked in 3 Companies Q915. Does importing a package imports all its sub packages too ? Core Java
Ans. No, but we can use wild card (*) to do so Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Asked in 1 Companies basic Q916. What is the default value of a declared object reference ? Core Java
Ans. Null Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Asked in 1 Companies basic Q917. Is there a way to know size of an object in Java ? Core Java
Ans. No, Java doesn't have a sizeOf operator. In C / C++ , its required to determine how much memory allocation is required which is not the case with Java. Java handles memory allocation and deallocation intrinsically. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Asked in 1 Companies rare Q918. What are the different ways to handle an exception ? Core Java
Ans. 1. Wrap the desired code in try block followed by a catch / finally to catch the exception Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Asked in 4 Companies Q919. How does Java handle integer overflows and underflows? Core Java
Ans. It uses those low order bytes of the result that can fit into the size of the type allowed by the operation. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Asked in 1 Companies rare Ans. No, delete is not a keyword in Java. Destruction of objects is taken care by Java Garbage Collection mechanism. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Asked in 1 Companies Ans. No exit is a method to exit execution of a program. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Asked in 1 Companies Q922. Who invokes a thread's run method ? Core Java
Ans. After a thread is started using a call to start method, JVM invokes the thread’s run method when the thread is initially executed. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Asked in 1 Companies Ans. Interface that is declared inside the interface or class, is known as nested interface. It is static by default. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve intermediate Q924. What kind of thread is garbage collection thread ? Core Java
Ans. Daemon thread Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve intermediate Q925. What is the difference between the Reader/Writer java.io hierarchy and the Stream class hierarchy? Core Java
Ans. The Reader/Writer hierarchy is character oriented, whereas the Stream class hierarchy is byte oriented. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve intermediate Ans. It's an object that reads from one stream and writes to another. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve intermediate Q927. Can we convert a numeric IP address to a web host name ? Java EE
Ans. Yes, using InetAddress.getByName("<IP Address>").getHostName(); Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve intermediate Q928. Difference between shallow copy and object cloning ? Core Java
Ans. Shallow copy is one of the way for object cloning, other being deep copy. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve basic Ans. Shutdown hook is a thread that is invoked before the JVM is shut down. we can use it perform resource cleaning task. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Q930. how to access the methods of an inner class? Core Java
Ans. It depends on the type of inner class Sample Code for inner class Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Asked in 1 Companies Intermediate frequent Q931. Which memory segment holds String Pool in Java ? Core Java
Ans. String Pool resides in runtime constant Pool which is a part of Heap memory segment. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Expert rare Q932. What are the cursors available in Java ? Core Java
Ans. Enumeration Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Q933. How can be restrict creation of more than n objects in Java ? Core Java
Ans. We can follow the same design which we follow in singleton Classes. We can have a static counter that will keep the count of number of objects already created, We can keep the constructor private and being called through the static method. We can keep incrementing the counter before calling the constructor and put a check to call only if it's lesser than n. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Asked in 1 Companies Q934. Do you feel that its useless to define hashCode method for a class ? Core Java
Ans. Yes its useless if we are not going to use its objects within Hash collection, For example - HashSet , HashMap. HashCode is used internally by these collections for Search. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Q935. What is the difference between filter and filter-mappings xml tag within deployment descriptor ? Java EE
Ans. filter tag speficies the filter name and respective class for handling filter action whereas filter mapping maps the filter to the url patterns ( specifying the url that needs to be intercepted ) Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Q936. Have you heard of SiteMesh ? Java EE
Ans. Sitemesh is a web page layout and decoration framework by OpenSymphony. SiteMeshFilter can intercept the requests and then build UI components (based on configuration) then renders the final page. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Q937. What is a class and object ? Core Java
Ans. Class is a template using which objects are created in memory. It's kind of a mold using which objects with body / state are made. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Asked in 4 Companies basic frequent Ans. Its used to access the object properties using the object reference or class properties using the Class Name. Moreover its used to access the classes and Interfaces of a package. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Q939. Does Java supports Default arguments ? Core Java
Ans. No Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Q940. Can we have only try block in java ? Core Java
Ans. No, It should be followed by either catch or finally. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve
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Sample Code for inner class
Default Constructor is provided by Java ... 
