What is the fastest type of JDBC driver ?

Correct Answer: Package is a collection of related classes and interfaces package declaration should be first statement in a java class

Correct Answer: None of the above

Explanation:

A is wrong because a class can extend nly one class .B is wrong because a class can implement any number of interfaces.C is wronb because both can can be done simulteneously.So, D is correct

Correct Answer: Complilation error

Explanation:

It is a compilation error it should be X extends Y implements Z

Correct Answer: An interface without having any methods and by implementing that interface if our objects will get same ability such type interfaces are called marker interface (or) ability interface (or) tag interface

Correct Answer: The finalize method is called by the garbage collector, just before releasing the object?s memory It is normally advised to release resources held by the object inside the finalize method

Correct Answer: use super keyword super keyword points immediate super class Class Sample { int a =23; } Class Sub extends Sample { String a = "bablu"; void show() { Systemoutprintln(a); //bablu System out println(thisa); //bablu System outprintln(supera); //23 } } Class Demo { Public static void main(string[] args) { sub s = new Sub(); sshow(); } }

Correct Answer: When writing Nodejs applications, ending up with hundreds or even thousands of dependencies can easily happen For example, if you depend on Express, you depend on 27 other modules directly, and of course on those dependencies' as well, so manually checking all of them is not an option! The only option is to automate the update / security audit of your dependencies For that there are free and paid options: 1 npm outdated 2 Trace by RisingStack 3 NSP 4 GreenKeeper 5 Snyk

Correct Answer: When we create string with new() Operator, it?s created in heap and not added into string pool while String created using literal are created in String pool itself which exists in PermGen area of heap String s = new String("Test"); does not put the object in String pool , we need to call Stringintern() method which is used to put them into String pool explicitly its only when you create String object as String literal eg String s = "Test" Java automatically put that into String pool

Correct Answer: Stored procedure should return error code if some operation fails but if stored procedure itself fail than catching SQLException is only choice

Correct Answer: Keyword

Explanation:

Reserved words are words that cannot be used as object or variable names in a Java program because they're already used by the syntax of the Java programming language.

Java reserved words are keywords that are reserved by Java functions or other uses that cannot be used as identifiers (e.g., variable names, function names, class names).

If a reserved word was used as a variable you would get an error or unexpected result.

 

Examples : Int, Long, Abstract, Class, Break, Catch, Case, Public, Static, Void,...