Java Quizzes Online & Trivia

Java is a programming language often seen in computers or when discussing computers. There are several different computer languages today, but Java is a very popular one. There are differences among the computer programming languages and they include being based on class or being oriented by objects as Java does. The main purpose that Java brags about is that it is simple to learn and use. Once you write the language for a program, it will automatically run without any problems occurring. Legal identifiers in Java use a certain code called Unicode which includes characters, numbers, and symbols but there are rules including that the identifiers have to begin with letters or characters. Therefore, ABC 1, OneAbc and Swihile would be identifiers.

The answer to this question is B. The database and JDBC resources are released if you call the method close() on a ResultSet object in Java. If you try to call the method close on a ResultSet task, it will automatically bring you to the database and then the JDBC resources will be released. This process allows you to be able to access databases which can then use this information depending on what information you need. To put it in simpler terms, the JDBC acts as a connection between the information database and the Java program. As such, once you can get access to the JDBC, you can locate and edit the database to fix problems within the java program or to correct any mistakes in the application.

These two are known to be scripting languages but they do have their differences. JScript is the type of language that is owned by Microsoft. This can only be used for applications and programs that are powered by Microsoft. JavaScript can be used by different people when they want to do some codes. They may be used to create programs and edit programs that are not owned by Microsoft. Another main difference between the two is the ability of JScript to access and open Internet Explorer. Java Script will not be able to do this. It is best that you know the difference between the two so you can decide which one will be more ideal to use.

An array is an average data structure that holds similar values of same data type. Arrays can hold references as well as primitives. For storing and accessing a sequence of objects, Array is the most efficient data structure Here is the list of most important array features you must know. • copying and cloning • insertion and deletion • searching and sorting As it is generally known, the Java language has only two data types which is the Primitives data type and References data type. An array is not a primitive data type because it has only one field called length. Hence, an array is a reference type.

Class A{ public static void main(String [] args){B b = new A();}}class B extends A {}

Why compilation fails......will show for this program unless arithimatic exception....

Correct answers – options A, B and E In Java, an identifier is anything used for the name to declare an entity. All identifiers must begin with a letter, an underscore or a Unicode of currency. Any other symbol such as numbers and a period (.) is not valid. Also, an identifier cannot have the same spelling as a Java reserved words. Option A is correct because it has a dollar sign (Unicode of currency) Option B is correct because it begins with an underscore Option C is incorrect because it begins with a period (.) which is invalid and the word “true” is a java reserved word. Option D is incorrect because it begins with a period Option E is correct because it begins with a letter Option F is incorrect because it begins with a number. Numbers are invalid.

The answers are B and C, JDBC stands for Java Database Connectivity and it is an API (application programming interface) to access relational databases, spreadsheets, and flat files. The clients of this application can access a database where they update and query a data that will then be oriented to the relational databases. JDBC allows multiple users to update, erase or add data all at the same time in that application. This greatly helps information technology companies to work together in the same program using their respective computers. This increases work effectiveness and can produce more quality and more accurate outputs by the team. A JDBC driver manager is needed to create connections.

The right statement is that the elements in the collection are ordered. This is because a state of order is more likely ad the collection is more likely to be ordered. There are multiple reasons that point to placing things in order. However, you need to know the meaning of the class java.util.ArrayList. Your sales department is looking for a person who understands the language as well as the complex rules which guarantees them good returns. If you are able to understand the complexity of the class Java.util.Arraylist it is a great asset. You can use it to impress your hiring team and excel in your department.

Public static void main(String [] args) { System.out.print("A"); processRequest(); processRequest(); showMenu(); eraseFile(); System.out.print("B"); } public static void showMenu() { System.out.print("Q"); } public static void eraseFile() { System.out.print("T"); } public static void processRequest() { System.out.print("2"); }

The pressure point is 8.1 mmHg. There are different types of industries that normally make use of different types of tubes. Their main goal for this is to make sure that various chemicals, especially those that have the potential to be corrosive are housed properly. Just imagine if corrosive chemicals will just be allowed to go through tubes that are not secure. It might hurt the people who are working in the factory. It is important to know the computation of certain things to ensure that all the things will go according to plan. Careful computation is important to make sure that the place where people work will be safe.

This question has two answers: both 1 and 2 are correct. When considering which of the choices listed above that would be a valid statement about Apex classes and interfaces in java, the default modifier for a class is private is the answer that jumps out to me first since the default modifier for inner classes are private. The second answer which is also a valid statement about Apex classes and interfaces in Java is that exception classes must end with the word exception. This is the way for the program to be able to identify that a class is an exception class and not an ordinary class. You can learn all about this topic and find answers to other questions in the Java section.