ITEMP Java Quiz 2

1.

A Java source code can be created in ______ .

MS Paint

NetBeans IDE

Photoshop

MS Excel

NetBeans IDE is a popular integrated development environment (IDE) for Java programming. It provides tools and features that allow developers to create, edit, compile, and run Java source code. With NetBeans IDE, developers can easily write and manage their Java programs, making it a suitable choice for creating Java source code. MS Paint, Photoshop, and MS Excel are not suitable tools for creating Java source code as they are primarily used for image editing and spreadsheet tasks.

Explanation

NetBeans IDE is a popular integrated development environment (IDE) for Java programming. It provides tools and features that allow developers to create, edit, compile, and run Java source code. With NetBeans IDE, developers can easily write and manage their Java programs, making it a suitable choice for creating Java source code. MS Paint, Photoshop, and MS Excel are not suitable tools for creating Java source code as they are primarily used for image editing and spreadsheet tasks.

2.

Which of the following declarations of the main method in a Java application is correct?

Public void main(String args)

Public static void main(String[ ] args)

Public static void main(string[ ] args)

Public void main()

The correct answer is "public static void main(String[ ] args)". In Java, the main method is the entry point for a Java application. It must be declared as public, static, and void. The parameter "String[ ] args" allows command-line arguments to be passed to the main method.

Explanation

The correct answer is "public static void main(String[ ] args)". In Java, the main method is the entry point for a Java application. It must be declared as public, static, and void. The parameter "String[ ] args" allows command-line arguments to be passed to the main method.

3.

You are responsible for writing a new Java class, Employee, which will be used by several other classes in a large project. Select the correct way to declare the class, from the list below:

New class Employee

Protected class Employee

Private class Employee

Public class Employee

The correct way to declare the class is "public class Employee". This is because the class needs to be accessible to other classes in the project, and using the "public" access modifier ensures that it can be accessed from anywhere within the project.

Explanation

The correct way to declare the class is "public class Employee". This is because the class needs to be accessible to other classes in the project, and using the "public" access modifier ensures that it can be accessed from anywhere within the project.

4.

Which is the software you need to develop Java programs ?

JDK (Java Development Kit)

JRE (Java Runtime Environment)

Java API

JVM (Java Virtual Machine)

JDK (Java Development Kit) is the correct answer because it is the software that provides the necessary tools and components to develop Java programs. It includes the Java compiler, debugger, and other development tools that are essential for writing, compiling, and running Java code. JRE (Java Runtime Environment) is used to run Java applications, but it does not include the tools needed for development. Java API is a library of prewritten classes and methods that developers can use in their programs. JVM (Java Virtual Machine) is the runtime environment in which Java programs are executed.

Explanation

JDK (Java Development Kit) is the correct answer because it is the software that provides the necessary tools and components to develop Java programs. It includes the Java compiler, debugger, and other development tools that are essential for writing, compiling, and running Java code. JRE (Java Runtime Environment) is used to run Java applications, but it does not include the tools needed for development. Java API is a library of prewritten classes and methods that developers can use in their programs. JVM (Java Virtual Machine) is the runtime environment in which Java programs are executed.

5.

The _______ is used for compilation and the _______ is used for execution of the Java application.

Java compiler, Java interpreter

Java interpreter, Java executer

Java compiler, Debugger

Java compiler, Javadoc

The Java compiler is used for compilation, which means it translates the Java source code into bytecode. The bytecode is then executed by the Java interpreter, which is responsible for translating the bytecode into machine code that can be understood and executed by the computer. Therefore, the Java compiler and Java interpreter are used for different stages of the Java application's lifecycle - compilation and execution respectively.

Explanation

The Java compiler is used for compilation, which means it translates the Java source code into bytecode. The bytecode is then executed by the Java interpreter, which is responsible for translating the bytecode into machine code that can be understood and executed by the computer. Therefore, the Java compiler and Java interpreter are used for different stages of the Java application's lifecycle - compilation and execution respectively.

6.

Which of the following is not a valid comment?

/** comment */

/* comment */

/* comment

// comment

The answer is /* comment because it is missing the closing */ symbol, making it an invalid comment. The other options /** comment */, /* comment */, and // comment are all valid comments in different programming languages.

Explanation

The answer is /* comment because it is missing the closing */ symbol, making it an invalid comment. The other options /** comment */, /* comment */, and // comment are all valid comments in different programming languages.

Itemp Java Quiz 2