You will get compilation error at highlighted row with text “The type Rectangle cannot subclass the final class Shape”. CallableStatement cs = connection.prepareCall("{call.getPassword()}"); CallabledStatement callable = conn.prepareCall("{call getPassword()}"); CallableStatement cab = con.prepareCall("{call getPassword()}"); Callablestatement cstate = connect.prepareCall("{call getpassword()}"); It prints A and B with a 1000 seconds delay between them. Tight coupling is also used in some cases, like when an object creates some other objects that are going to be used by them. java mcqs online test.

Please wait while the activity loads. Posted by: InstanceOfJava Whereas, the second import statement only imports the Object class of the java.lang package. Explanation: The final is a reserved keyword in Java that is used to make a variable, method, and class immutable. It means when you make a variable or class or method as final you are not allowed to change that variable or class or method and compiler will verify this and gives compilation error if you try to re-initialized final variables in java. "final" keyword In Java can be used with different three contexts in java like variable, method and class. Explanation: The import keyword is used to access the classes and interfaces of a particular package to the current file. If this activity does not load, try refreshing your browser. Final class is complete in nature and cannot be inherited. A final variable can be explicitly initialized only once. It is a part of the Java Platform Debugger Architecture (JPDA) that helps in the inspections and debugging of a local or remote Java Virtual Machine (JVM).

These java multiple choice interview questions asked in various java interview exams. Step 1: First we create a class X and make it final class by using final keyword: Step 2: Second we create a class Y which is trying to extend final class X: Step 3: Third we create a class FinalClass: Your email address will not be published.

Hence, an asterisk (***) will be printed eight times, and plus (+++++) will be printed seven times. 35) Which of the given methods are of Object class? It leads to the poor performance or deadlock of threads. It generally occurs during the execution of multi-threaded application. Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. 43) Which of the following code segment would execute the stored procedure "getPassword()" located in a database server? So the state of the object can be changed but not the reference. Tight coupling is the correct answer as it is used when the logic of one class is called by the logic of another class. The getClass() method of the Object class returns the runtime class of this object. We can call static methods using this from non static methods but it is not recommended : The static method should be accessed in a static way. The CallableStatement can return either a single ResultSet object or multiple ResultSet objects. 0, Tagged with: In this post, we will see about final keyword in java.Final keyword can be associated with: variable; method; class; Final is often used when you want restrict others from doing any changes. The need for synchronization is to perform thread-safe operations on the class. But without assigning the value of i/9 to a variable, it would not execute, and an exception is thrown, as shown below. Explanation: The getName() method of the Class class returns the name (as String) of the entity (class, interface) represented by this Class object. One is a byte stream, and the other is the character stream. Explanation: A mutable class is a class in which changes can be made after its creation. Explanation: According to the class hierarchy of Throwable class, the Error and Exception classes are the direct subclasses of the Throwable class, as shown below. Yes We can return this as current class object. Dec 19, 2016 Explanation: In Java, multiple threads can be executed at the same time. Java Java Programming Java 8. final is a non-access modifier for Java elements. Explanation: The final is a reserved keyword in Java that is used to make a variable, method, and class immutable. It is because of the execution order of the program. ( Please use ide.geeksforgeeks.org, generate link and share the link here. You can use final keyword with variable, method, and class. Q) False statement about final method in java. Thread-safe means that the methods and objects of a class are accessible by multiple threads at the same time. Explanation: The nameless objects are basically referred to as anonymous objects. Hence, the correct answer is an option (c). The correct statement will be:
In this tutorial, we will find out about Java final variables, methods, and classes with examples. Exception in thread "main" java.lang.Error: Unresolved compilation problem: Also, this page requires javascript. If you want to make any non static data member as a blank final variable then it has to be initialized via constructor only. The Random class provides a variety of methods that are used to create random numbers of type integers, float, long, double, etc. When a method is overridden in the child class. If you remove draw method from rectangle class, it will work fine. The wait() method is used to make a thread to wait until another thread invokes the notify() or notifyAll() methods for an object. The quiz contains multiple choice and output of program questions for interview preparation The char literals are always declared in single quotes (').