Core Java Interview Questions
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Is it possible to write JAVA program without including any of the packages,such as "import*"; bcoz I instantly wrote a code without "import..." statement and runned the program on command Line & it worked. the code is: class Person { String name; int age; Person(String s,int a) { name = s; age = a; } accept() { System.out.println(name+"Hi!!!!!"); System.out.println(age); } } class Demo { public static void main(Strings args[])throws IOException { String name = args[0]; int age = Integer.parseInt(args[1]); Person p = new Person(name,age); p.accept(); } }

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1) There are 10 different threads in runnable state. Each having priority 1 to 10. How does the CPU schedules or executes these threads?


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2) Suppose there are 5 directories having lot of files (say txt files) in each directory. 2 things :- 2.1) You want to search for filenames which have a particular pattern. 2.2) Out of these filtered files you want to search for a particular keyword or a search string. How can you achieve this?



3) Suppose you are a very rich person, having 50 rooms and you have lost the key for one of the room's. How effectively you can find this key? (Qs2 and Qs3 are related)


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Suppose there is a System A which gives some output. This output is used as input by system B. The rate at which System A produces is faster than the rate at which system B consumes it. How can you improve this?


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Suppose there is an Online shopping cart application having different objects like Cart, SelectionItem, Billing, COnfiguration, Authentication, Authorization, PersonalDetails etc. Out of this which one can be made a singleton pattern and why?


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What is Co-Variant return type in method overriding?


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7) Suppose there is Student class like class student { int age; string name; } We want to store these objects in a HashMap. Do we need to override any methods in Student class? If any which ones and why? what if i just override equals or just hashcode? what will be the results in both the cases?

CSC, Nagarro, RBS,

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Can an abstract class have a constructor?

RBS, Wipro,

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What is the life cycle of Servlet?

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JVM responsibility?


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explain Anonynous inner class?


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why is S capital in System.out.println ????

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what is difference between length and length()?

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how your day start in your company

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Un-Answered Questions { Core Java }

Is 64bit faster than 32 bit?


What is the difference between processes and threads?


What is a buffer in computer?


What is the difference between double and float variables in java?


What are "class access modifiers" in Java?


Why is the main method declared static?


What is the difference between replace and replace all?


Why do we need hashset in java?


What is a file pointer?


Is it correct to say that due to garbage collection feature in java, a java program never goes out of memory?


which pattern is default in scanner package?


How is the marker interface used in Java?


How do you find the maximum number from an array without comparing and sorting?


How do you use nextline in java?


Can a vector contain heterogenous objects?