Hi, can someone please help me with these computer science questions. i am really having a  tough time. thank you.  Which of the following is not an acceptable way of indicating comments in java...

Hi, can someone please help me with these computer science questions. i am really having a  tough time. thank you. 

  1. Which of the following is not an acceptable way of indicating comments in java and briefly explain why?
  1. /** comment */
  2. // comment
  3. /* comment */
  4. // comment comment
  5. /*comment comment*/
  1. Describe what you would do if the interpreter returns the following error     Exception in thread "main" java.lang.NoClassDefFoundError: HelloWorldApp.java.

 

3. Modify this program so that it prints out Goodbye Weekend! instead of Hello World!

/** * The HelloWorldApp class implements an application that * simply displays "Hello World!" to the standard output. */ class HelloWorldApp
{ public static void main(String[] args) { System.out.println("Hello World!"); //Display the string. }

  1. Write a Java Application which when run as a class, produces the following output:

    Java rules
    the waves!

    Include a copy of the code as well as a screen shot when the you run the program.



Asked on by moeenmoeen

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t-rashmi's profile pic

t-rashmi | College Teacher | eNotes Newbie

Posted on

1. Although all are some types of comments. /** comment */ is not simple text comment. It is a documentation comment used for combining html codes into java programs.

2. In case of Exception in thread "main" java.lang.NoClassDefFoundError: error, 

you need to add the class or .jar file which contains this class into the java classpath. When you are running a java class from the command line, you need to add the dot (.)

java YourSingleClass -cp .

into the classpath which tells the JVM to search for classes in actual directory.


If you are running a class from a .jar file, you need to add this jar file into the classpath:

java org.somepackage.SomeClass -cp myJarWithSomeClass.jar

 

3. class HelloWorldApp
{ public static void main(String[] args) { System.out.println("Goodbye Weekend!"); //Display the string. }

4.  class javarules
{
public static void main(String args[])
{
System.out.println("Java rules \nthe waves!");
}
}//end of class
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