MS-DOS 'Hello World' Program Analysis

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Questions and Answers

What is the purpose of the first line 'public class Hello' in a Java program?

  • To close the class definition
  • To define the main method
  • To indicate the start of a class named Hello (correct)
  • To specify the name of the method

Why is it important for a class name to start with a capital letter in Java?

  • It indicates that the class is an interface
  • It helps differentiate classes from methods (correct)
  • It is mandatory for all classes
  • It is a convention but not mandatory

What is the purpose of the curly brackets { } in Java programming?

  • To mark the beginning of a loop
  • To define the main method
  • To indicate the start and end of a class or method (correct)
  • To specify the return type of a method

What does the 'main' method in a Java application contain?

<p>A collection of programming instructions that describe how to carry out a particular task (D)</p> Signup and view all the answers

What does the keyword 'public' before the 'main' method indicate?

<p>It makes the application accessible from outside (D)</p> Signup and view all the answers

Why must every opening curly bracket have an associated closing bracket in Java?

<p>To enclose and define the scope of classes or methods (D)</p> Signup and view all the answers

What is the purpose of the semi-colon at the end of each instruction in Java?

<p>To indicate that it is a statement (D)</p> Signup and view all the answers

What is a sequence of characters enclosed in double quotes known as in Java?

<p>String (A)</p> Signup and view all the answers

Which error is detected by the compiler in Java programming?

<p>Syntax error (D)</p> Signup and view all the answers

In Java, what symbols are used to write comments that span multiple lines?

<p>/* */ (D)</p> Signup and view all the answers

What does the method main() in Java indicate?

<p>It indicates the starting point of the program (D)</p> Signup and view all the answers

What is the purpose of System.out.println() in Java?

<p>To print to the console and move to a new line (C)</p> Signup and view all the answers

'Hello World' would be displayed on screen as ________.

Signup and view all the answers

Which menu option is used to compile a Java program in an IDE?

<p> Build (D)</p> Signup and view all the answers

'public class Hello' must be saved as ________.

<p> Hello.java (D)</p> Signup and view all the answers

What is the purpose of methods in Java?

<p>To perform certain tasks and return information if necessary (D)</p> Signup and view all the answers

Why is it important for a Java class file name to match its class name?

<p>To enable proper running of the program (A)</p> Signup and view all the answers

A Java program is a class.

<p>True (A)</p> Signup and view all the answers

Every class in Java has a name that starts with a lowercase letter.

<p>False (B)</p> Signup and view all the answers

The 'main' method in a Java application is where execution of the program starts.

<p>True (A)</p> Signup and view all the answers

The keyword 'public' before the 'main' method indicates that the application is accessible from the outside.

<p>True (A)</p> Signup and view all the answers

In Java, comments that span multiple lines are written using //.

<p>False (B)</p> Signup and view all the answers

Every opening curly bracket in Java must have an associated closing bracket.

<p>True (A)</p> Signup and view all the answers

A Java program starts with the first instruction of main method.

<p>True (A)</p> Signup and view all the answers

The 'System.out.println()' statement is used to print a string to the screen and start a new line.

<p>True (A)</p> Signup and view all the answers

A sequence of characters enclosed in double quotes in Java is known as an Integer.

<p>False (B)</p> Signup and view all the answers

To compile a Java program in an IDE, you should go to the 'Build' menu and select 'Compile'.

<p>True (A)</p> Signup and view all the answers

The error 'System.ou.println("Hello");' is a compile time error in Java.

<p>True (A)</p> Signup and view all the answers

Comments written by the programmer are ignored by the compiler in a Java program.

<p>True (A)</p> Signup and view all the answers

The 'println' statement in Java is short for 'print only'.

<p>False (B)</p> Signup and view all the answers

A method in Java is a block of code that performs certain tasks and can return information if necessary.

<p>True (A)</p> Signup and view all the answers

Compile time errors in Java are detected by the IDE at runtime.

<p>False (B)</p> Signup and view all the answers

In Java, it's important for a class file name to match its class name with a .java extension.

<p>False (B)</p> Signup and view all the answers

In Java, every opening curly bracket must have an associated closing bracket.

<p>True (A)</p> Signup and view all the answers

'public class Hello' must be saved with a .java extension.

<p>True (A)</p> Signup and view all the answers

A Java program starts with the first instruction of the main method.?

<p>True (A)</p> Signup and view all the answers

Every opening curly bracket in Java must have an associated closing bracket.?

<p>True (A)</p> Signup and view all the answers

The keyword 'public' before the 'main' method indicates that the application is accessible from the outside.?

<p>True (A)</p> Signup and view all the answers

'Hello World' would be displayed on screen as ____.?

<p>False (B)</p> Signup and view all the answers

'public class Hello' must be saved with a .java extension.?

<p>True (A)</p> Signup and view all the answers

The 'println' statement in Java is short for 'print only'.?

<p>False (B)</p> Signup and view all the answers

A program in Java starts with the first instruction of the main method.

<p>True (A)</p> Signup and view all the answers

The 'println' statement in Java is short for 'print only'.

<p>False (B)</p> Signup and view all the answers

Every opening curly bracket in Java must have an associated closing bracket.

<p>True (A)</p> Signup and view all the answers

The error 'System.ou.println("Hello");' is a compile time error in Java.

<p>True (A)</p> Signup and view all the answers

In Java, it's important for a class file name to match its class name with a .java extension.

<p>False (B)</p> Signup and view all the answers

The 'System.out.println()' statement is used to print a string to the screen and start a new line.

<p>True (A)</p> Signup and view all the answers

Comments written by the programmer are ignored by the compiler in a Java program.

<p>True (A)</p> Signup and view all the answers

A method in Java is a block of code that performs certain tasks and can return information if necessary.

<p>True (A)</p> Signup and view all the answers

Every class in Java has a name that starts with a lowercase letter.

<p>False (B)</p> Signup and view all the answers

'public class Hello' must be saved with a .java extension.

<p>True (A)</p> Signup and view all the answers

'Hello World' would be displayed on screen as ________.

<p>False (B)</p> Signup and view all the answers

'public class Hello' must be saved as ________.

<p>False (B)</p> Signup and view all the answers

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