Questions and Answers
A Java program is best classified as:
6 bits can be used to represent ________ distinct items.
64
When executing a program, the processor reads each program instruction from ________.
main memory
Which memory capacity is the largest?
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Binary numbers are composed entirely of ________.
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Volatility is a property of ________.
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The ability to directly obtain a stored item by referencing its address is known as ________.
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Which phase of the fetch-decode-______ cycle might use a circuit in the arithmetic-logic unit?
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In order for a computer to be accessible over a computer network, the computer needs its own ________.
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For a computer to communicate over the Internet, it must use ________.
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A URL (Universal Resource Locator) specifies the address of ________.
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It is important to dissect a problem into manageable pieces before trying to solve the problem because ________.
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Once we have implemented the solution, we are not done with the problem because:
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Java is an example of:
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In the following list, which statement is not true regarding Java as a programming language?
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Comments should ________.
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The main method for a Java program is defined by ________.
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The line of Java code 'System.out.println("Hello");' will ________.
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The instruction: System.out.println("Hello World"); might best be commented as ________.
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Which character below is not allowed in an identifier?
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Which of the following is not syntactically legal in Java?
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Which of the following is a legal Java identifier?
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A unique aspect of Java that allows code compiled on one machine to be executed on a machine of a different hardware platform is Java's ________.
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Java is similar in syntax to what other high-level language?
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An error in a program that results in the program outputting $100 instead of the correct answer, $250 is ________.
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Which of the following is true regarding Java syntax and semantics?
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Study Notes
Java Basics
- A Java program is classified as software.
- 6 bits can represent 64 distinct items.
- During program execution, the processor reads instructions from main memory.
Memory and Data
- The largest memory capacity is 12,000,000 megabytes.
- Binary numbers consist exclusively of 0s and 1s.
- RAM is characterized by volatility.
Accessing Data
- The concept of random access allows direct retrieval of stored items using their addresses.
- In the fetch-decode-execute cycle, the arithmetic-logic unit is utilized during the execute phase.
Networking
- Computers require a unique network address for network accessibility.
- Communication over the Internet necessitates the TCP/IP protocol combination.
URLs and Problem Solving
- A URL specifies the address of a document or file on the Internet.
- Decomposing complex problems into manageable pieces simplifies their resolution.
Solution Implementation
- After implementing a solution, ongoing evaluation is essential due to potential inefficiencies, errors, or future specification changes.
- Java is categorized as both a high-level language and a fourth-generation language.
Characteristics of Java
- Java was introduced in 1995, is object-oriented, and supports web-based program execution.
- Contrary to some beliefs, Java requires programs to be translated into machine language before execution.
Coding Practices
- Comments in code should clarify the intent behind instructions.
- The main method in Java is defined as
public static void main(String[] args)
. - Code like
// System.out.println("Hello");
serves as a comment and performs no action.
Identifiers and Syntax
- Valid identifiers in Java can include characters like
$
,_
, and letters but exclude characters like^
. - A piece of code written incorrectly like
s t a t i c main(String[ ] args)
is syntactically illegal. - The identifier
i
is a legal Java identifier, whereasclass
andidon'tlikeclass
are not.
Java Execution Features
- Java's bytecodes enable cross-platform execution; code compiled on one machine can run on different hardware.
- Java syntax resembles C++, showcasing its high-level language structure.
Error Types
- A logical error example is when a program outputs an incorrect amount, such as $100 instead of $250.
- Java compilers can check for syntax but not always for semantics, which refers to the meaningfulness of the code.
Recap on Java Syntax and Semantics
- A Java compiler verifies if syntax rules are followed, but semantic correctness relies on naming conventions and logical application within the program.
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Description
Test your knowledge of Java programming with these flashcards. This quiz covers key concepts such as memory, binary representation, and software classification. Prepare to reinforce your understanding of the fundamentals in Java.