Question

In: Computer Science

In JAVA A. A Java applet is a stand-alone program that does not require a web...

In JAVA

A. A Java applet is a stand-alone program that does not require a web browser. True or False

B.Which of the following are valid identifiers in java? (will the identifier compile?)

Object#Count
$money
Late_Fee
__$__

C.What is the decimal (base 10) equivalent of 162 in octal?

D.Which of these identifiers obey the naming convention for object names?

Isthisokay
goodName
C3PO
ThisIsReallyOkay
areallygreatname
anotherBadOne

Expert Solution

A) False

Explanation: Java applet is a java program but can not directly run on a standalone machine.To run a applet we need a web browser which is java enabled.Hence we require a web browser and it is not stand alone.

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B)

Rules for identifiers in Java.

1) Identifiers contain only alphanumeric characters [a-z][A-Z][0-9], Dollar($) and underscore ( _ )

2) It should not start with numbers.

3) It should not be a reserved word in Java.

Object#Count - Invalid. It contains '#' , which is not allowed in Java identifiers
$money - Valid.
Late_Fee - Valid
__$__ - Valid

The above valid identifiers are valid because they hold the above mentions rules.

If the identifiers are invalid , they dont get complied,(we get an error).

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C)

Given to find decimal equivalent of (162)₈

= 64 + 48 + 2=114.

Answer 114.

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D)Naming convention for objec names:

Start with a lower case letter
Do not start with dollar or underscore.
It should be mnemonic

4.If the name contains more than one word, start with a lower case letter of first word and next word should start with upper case. Example: functionName

Isthisokay - Does not obey . As this is starting with uppercase letter .

Correct Convention- isThisOkay

goodName - Obey. As this is starting with lower case letter and next word is started with upper case letter.

C3PO - Does not Obey .As starting with upper case letter.

ThisIsReallyOkay - Does not Obey. As starting with upper case letter.

Correct convention: thisIsReallyOkay

areallygreatname - Does not Obey. As the first letter of next word is not upper case.

Correct convention: aReallyGreatName

anotherBadOne - Obey. As this is starting with lower case letter and next word is started with upper case letter.

venereology answered 1 month ago

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