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Interview Questions and Answers - Order By Newest | ||||
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Ans. An Exception in java is the occurrence during computation that is anomalous and is not expected. Exception handling is the mechanism which is used to handle such situations. | ||||
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Like Discuss Correct / Improve  exception handling Asked in 18 Companies basic   frequent | ||||
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Ans. https://www.geeksforgeeks.org/heap-sort/ | ||||
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Like Discuss Correct / Improve  sorting  heap sort Asked in 1 Companies   frequent | ||||
Frequently asked Spring interview question. | ||||
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Ans. Core: [Core, Bean, Context, Expression Language] Web: [Web, Portlet, Servlet, etc] Data Access [JMS, JDBC, etc] AOP, Aspect | ||||
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Like Discuss Correct / Improve  spring  spring framework components Asked in 12 Companies | ||||
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Ans. Yes | ||||
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Like Discuss Correct / Improve   Asked in 1 Companies | ||||
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Ans. public class StackUsingArrayList { public static void main(String[] args) { List list = new ArrayList(); list.add("A"); list.add("B"); list.add("C"); Stack stack = new Stack(); list.forEach(a -> stack.add(a)); System.out.println(stack); } } | ||||
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Ans. https://www.geeksforgeeks.org/arrays-sort-in-java-with-examples/ | ||||
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Like Discuss Correct / Improve  array  sorting Asked in 16 Companies basic   frequent | ||||
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Ans. == compares values === is used in scripting languages for comparing two values as well as there data tpe. like in js,php. | ||||
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Like Discuss Correct / Improve  ==  ===  == vs === Asked in 13 Companies basic   frequent | ||||
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Ans. Abstract class is one of the facility for achieving abstraction in Java. | ||||
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Ans. public static void printTriagle(int n) { // outer loop to handle number of rows // n in this case for (int i=0; i1; j--) { // printing spaces System.out.print(" "); } // inner loop to handle number of columns // values changing acc. to outer loop for (int j=0; j<=i; j ) { // printing stars System.out.print("* "); } // ending line after each row System.out.println(); } } // Driver Function public static void main(String args[]) { int n = 5; printTriagle(n); } | ||||
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Ans. If you have mulitple Databases you just need to add multiple configuration files and create the corresponding SessionFactory object. | ||||
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Ans. SOAP supports only xml whereas Rest support many other formats. Rest services are very light weight compared to SOAP. SOAP services are code heavy as they require creation. of stubs and skeltons. | ||||
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Like Discuss Correct / Improve  soap  rest  soap vs rest Asked in 2 Companies | ||||
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Ans. J2ee Web Containers and Core Containers | ||||
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Ans. Using comparable and comparator and sorted collections like TreeSet or TreeMap. or use stream api from java 8 onwards which internally refers to comparable and comparator through lambda expressions | ||||
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Like Discuss Correct / Improve  sort  sorting  comprator  comparable  treeset  treemap  sorting collections Asked in 1 Companies Basic   frequent | ||||
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Ans. Select salary from (select salary from employee where department = order by salary desc limit 5) emp order by salary limit 1 AND Select salary from (select salary from employee where department = order by salary desc limit 2) emp2 order by salary limit 1 | ||||
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Like Discuss Correct / Improve  sql  database   find 2nd highest salary sql database Asked in 1 Companies | ||||
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Ans. @component mark a java class as a bean so that component scan mechanism of spring pick it up and register in IOC container. | ||||
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Like Discuss Correct / Improve   Asked in 1 Companies | ||||
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Ans. Use Comparable or Comparator interface | ||||
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Like Discuss Correct / Improve  sql query Asked in 1 Companies | ||||
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Ans. Primary key will not accept NULL values whereas Unique key can accept one NULL value. A table can have only primary key whereas there can be multiple unique key on a table. A Clustered index automatically created when a primary key is defined whereas Unique key generates the non-clustered index. | ||||
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Like Discuss Correct / Improve  Unique Key  Primary Key Asked in 1 Companies | ||||