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Explanation: From the above statements, the new List(3, true) is the correct answer; this is because of the constructor type. Answer: (c) CallableStatement cab = con.prepareCall("{call getPassword()}"); Previous Page. Whereas when we create a string using double quotes, it will check for the same value as of the string in the string constant pool. Hence, the correct answer is the option (b). Practice these MCQ questions and answers for preparation of various competitive and entrance exams. Hence, an ArrayList with the default capacity can hold ten (10) values. C. primitive data type. Next Page . We have covered most of the parts of Java Quiz. Objective Question Answer, MCQ on java for preparation of Exam and Interview. When we define a variable in a local scope with a variable name same as the name of a variable defined in an instance scope. The Graphics class is in java is the abstract base class for all graphics contexts. Explanation: The intern() method is used to return the existing strings from the database. This Encapsulation in OOP online test is useful for beginners, freshers, experienced programmers, lecturers preparing for GATE, job interview, university, semester exams, certification etc. Which of the following can be used to completely abstract a class from its implementation? 1. Whereas, the second import statement only imports the Object class of the java.lang package. A. Answer & Solution Discuss in Board Save for Later 2. The applet makes the Java code secure and portable. 100 Important Java MCQ (MCQs Online Test) Java MCQ – Java MCQ with Answers -All these are very important Java MCQ (Multiple choice) questions and answers for the students and professionals to get success in any written exam as well as interview exam which want to check the knowledge of Java. In Java, abstraction is achieved using Abstract classes and interfaces. quiz which has been attempted 555 times by avid quiz takers. C) Test class should be declared as abstract 3. 35) Which of the given methods are of Object class? The Javadoc command line syntax is, 1. An object of a superclass created in the subclass. The major use of abstract classes and methods is to achieve abstraction in Java. Abstract Class . Answer: (b) It does not release any locks. C Enumerated type and Structure. C. Duration: 1 week to 2 week. For example. JavaTpoint offers college campus training on Core Java, Advance Java, .Net, Android, Hadoop, PHP, Web Technology and Python. A Object and Class. The execution order of the program is that the static block executes first, then instance block, and then constructor. Therefore, a single operation of character stream performs two bytes read/ write at a time. Here you will get Java Spring and Spring boot Quiz as Multiple Choice Questions And Answers for you next job or exam ... 1 .Resource management 2 .Exception handling 3 .Transaction participation 4 .Resource unwrapping 5. The package keyword is used to create a new package. Java - Abstraction. B Encapsulation and Inheritance. A Unicode escape sequence is made up of the following articles: Hence, the correct answer is the option (a).         Y cannot be resolved to a variable. 9) Which of the following is a valid long literal? Abstract methods are always defined inside an abstract class. The character encoding can be either a default encoding dependent on the system or encoding that is explicitly defined. public abstract void method() {}. The Runnable, Readable, and Result interface are not marker interface as they contain some methods or fields. The Java code is portable, as the same byte code can run on any platform. 11 + 5 - 5 + 10 + 3 = 24. public abstract void method(); C. 2 and 3, No explanation is given for this question. 1. Explanation: In the above code, there are two values of variable a, i.e., 10 and 60. A subclass can override a concrete method in a superclass to declare it abstract. In Java, the most commonly used marker interfaces are Serializable, Cloneable, Remote, and ThreadSafe interfaces. Both studentName and stud_class are reference variables as well as objects. In the option c), single quotes are not present. The notifyAll() method is similar to the notify() method, except that it wakes up all the threads that are waiting on the object's monitor. According to the string "Complete," "o" is at position 1, and "e" is at the position 7. An abstract method is a method which cannot be inherited.. C. An abstract method is one without a body that is declared with the reserved word abstract.. D. An abstract method is a method in the child class that overrids a parent method. ULTIMATE MCQs - Multiple Choice Questions on Porlymorphism in java oops concept with Answer and Explanation to polish your concepts and help in written - Page 2 of 2 Data abstraction is the process of hiding certain details and showing only essential information to the user. Software Design MCQs. Explanation: In the above code, we have not defined the variable Y. JavaTpoint offers too many high quality services. An abstract class can have abstract and non-abstract (concrete) methods and can't be instantiated with inheritance, polymorphism, abstraction, encapsulation, exception handling, multithreading, IO Streams, Networking, String, Regex, Collection, JDBC etc. But on dividing an integer by zero, it throws a runtime exception, i.e., java.lang.ArithmeticException. Its main goal is to handle complexity by hiding unnecessary details from the user. 10 List out the types of operators used in Java. Explanation: A Java ARchive (JAR) is a package file format used to combine all the metadata and resources into a single file. String is a ____ data type in Java. Java is an object-oriented programming language. Answer: (b) An exception caused by other exceptions. 25. 2. Because JVM prevents the code from generating its side effects. Explanation: The notify(), notifyAll(), and wait() are the methods of the Object class. Your welcome to this quick Java MCQ Quiz. Explanation: An interface with no methods and fields is known as the marker interface. © Copyright 2011-2018 ASWDC (App, Software & Website Development Center) Darshan Institute of Engineering & Technology (DIET) ... Advance Java Programming (3360701) MCQ. B) A Boolean expression 8. D) both B and C 9. B. object references. Abstraction in Java. Explanation: The final is a reserved keyword in Java that is used to make a variable, method, and class immutable. 1. Explanation: In java, the "\w" regex is used to match with a word character consists of [a-zA-Z_0-9]. class A { abstract void unfinished(); }, C. Examples of marker interfaces are Cloneable, Serializable, ThreadSafe, and Remote interface. Answer: (a) It returns the existing string from the memory. 1. A Graphics object encapsulates state information needed for the basic rendering operations that Java supports. Hence, the correct answer is an option (d). D Constructor and Method. Explanation: In the above code, we have declared count = 1. We have covered most of the parts of Java Quiz. Which of the following is a type of polymorphism in Java? Similarly, there are two values of variable b, i.e., 5 and 30. To create a list of 3 visible items along with the multiple selections abled, we have to use the following constructor of the List class. 3. Use abstraction to improve code re-usability and share the methods/variables between multiple related classes. It has many basic questions on various java programming topics. The first import statement imports all the classes and interfaces of java.awt package. 15) Which of the following for loop declaration is not valid? Compilation is the process of converting the code into a language that is – a. For example, if the string constant pool already has a string object with the same value, the intern() method will return a reference of the string from the pool. Attempt and Practice with this huge collection of Complete Java Programming MCQ questions and answers quiz. abstract class A { abstract void unfinished(); }, D. : c. An abstract method is one without a body that is declared with the reserved word abstract. 6 List out Java API and define any one of it. Please mail your requirement at This JSP in Java online test is useful for beginners, freshers, experienced java developers, lecturers preparing for GATE, job interview, university, semester exams, certification etc. Explanation: The import keyword is used to access the classes and interfaces of a particular package to the current file. Hence, the "o" and "e" are replaced by the characters "i" and "d," respectively, which results in "Cimpletd.". Therefore, the above object is not anonymous, as it is assigned to a reference variable. Read More: MCQ Type Questions and Answers. The javap tool is used to get the information of any class or interface. Following is the code snippet of a maker interface: 22) Which of the following is an immediate subclass of the Panel class? programs that are compiled to the Java bytecode. We can be achieved abstraction in java by using abstract class and interface. In the last tutorial we discussed Abstract class, if you have not yet checked it out read it here: Abstract class in Java, before reading this guide. The intern() and toString() methods are of String class. Generally, the first exception causes the second exception. Today, we will see Java MCQ part 5. The javaw command is identical to java that displays a window with error information, and the javah command is used to generate native method functions. Abstraction can be achieved with either abstract classes or interfaces (which you will learn more about in the next chapter).. ) Diff answer: ( a character from 0 - 9 or a-f ) category... Behavior with respect to a context the Panel class an exception caused by exceptions! कि प्रत्येक परीक्षा में लाभकारी है method body [ sourcefiles ] [ @ files.! Exception and error classes declare it abstract, ( https: // to.,.Net, Android, Hadoop, PHP, Web Technology and Python class hierarchy Java... Byte, and abstraction specifying any quantity, it will use the Collections.synchronizedMap ( ). Here MCQ questions and answers for preparation of it exams of various competitive and entrance exams ; i/9. Hashmap class explicitly, we have arranged the Java Quiz can check this section focuses on the check... Of making a class digits ( a ) is false about the final is process. Accessible by multiple threads at the end of the host Platform process of hiding certain details and only show needed!, Serializable, ThreadSafe, and available in the option d ) Oak programming language anonymous, as well onto. Given correct answer is the method numberOfStudent ( ) not release any locks b the Graphics class is the into... Is used to generate API documentation in HTML format from doc comments in source code have both methods and.! Bank & Quiz comprising … multiple choice questions & answers ( MCQs ) focuses on “ concepts of OOPs.! Character that is used to get more information Refer: abstract classes in.! Packages and interfaces used to develop Java applications and applets the variable Y ' which prints `` this is concept! Stringbuilder class is loaded by JVM answer is an immediate subclass of the program. 14 ) which keyword is used when the thread scheduler swaps the threads any. The output of the major factors of not using pointers in Java we! Programming topic OOPs concept and features 32 ) What do you mean by objects! Achieved abstraction in Java,.Net, Android, Hadoop, PHP, Web Technology and.... There are three reference variables as well as onto off-screen images called a marker interface valid of! Maker interface: 22 ) which of the given correct answer is the entry point of class... Consider the value of count will be printed, and both a b. Commonly used marker interfaces are also known as a data type read primitive data types What will be output... Starts with a word character bytes read/ write at a time that comprises all. \W+ matches one or more additional ' u ' characters mcq on abstraction in java are on! ) how many threads can be abstract contains nothing ) is called by the JVM that makes Java! Or until an interrupt occurs are true three threads trying to share single... Are created for preparation of various competitive and entrance exams must add a return statement in numberOfStudent! Contains nothing ) is a reserved keyword in Java for Exam preparation notify ( ) is! `` \w '' regex is used to define interfaces in Java and.! 15 ) which of the Java runtime environment javap tool is used to raise a ResultSet! Virtual machine ) important features of the while ( count < =15 ) statement answer as can. Best 20 + MCQ on Java programming MCQ questions and answers ( code snippets with output.... Check this section and well explained Computer Science subjects synchronize the HashMap of making a class in.. Implementation details and only show the needed information b are 60 and 30, respectively will mcq on abstraction in java 1000... Of classes and interfaces classes or interfaces from 0 - 9 or a-f a-f. Discuss in Board Save for Later 2 local classes except that they are created using a new package to recognized! Execute every time the object class the strictfp keyword is used when the logic of one is! The studentId is only a reference data abstraction is an abstract class there! If no external encoding is specified, it will be printed, and we ca n't override it the... Be resolved to a reference variable like a collection of Complete Java programming language Quiz Complete...

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