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Questions and Answers
System software is used for tasks such as word processing, calculations and playing games.
System software is used for tasks such as word processing, calculations and playing games.
False (B)
If an object's methods are well written, the user is unaware of the low-level details of how the methods are executed.
If an object's methods are well written, the user is unaware of the low-level details of how the methods are executed.
True (A)
A Java identifier can contain only letters, digits, ampersands, or number signs.
A Java identifier can contain only letters, digits, ampersands, or number signs.
False (B)
You must use the Java interpreter to translate the bytecode into executable statements before running a Java application.
You must use the Java interpreter to translate the bytecode into executable statements before running a Java application.
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When you issue the command to compile a class containing errors, the Java compiler does not produce any error messages.
When you issue the command to compile a class containing errors, the Java compiler does not produce any error messages.
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Logic errors are easily identified when a program is compiled.
Logic errors are easily identified when a program is compiled.
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It is Java standard that class identifiers begin with an uppercase letter.
It is Java standard that class identifiers begin with an uppercase letter.
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A compiler ignores whitespace (that is, any combination of nonprinting characters) between words and lines.
A compiler ignores whitespace (that is, any combination of nonprinting characters) between words and lines.
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Dots (or periods) in a Java statement are used to separate the names of the components that make up the statement.
Dots (or periods) in a Java statement are used to separate the names of the components that make up the statement.
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Using the void keyword in the main() method header indicates that a value will be returned by the main() method.
Using the void keyword in the main() method header indicates that a value will be returned by the main() method.
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A program written in ____ is the most basic circuitry-level language.
A program written in ____ is the most basic circuitry-level language.
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Locating and repairing all syntax errors is part of the process of ____ a program.
Locating and repairing all syntax errors is part of the process of ____ a program.
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____ are also called modules, methods, functions, and subroutines.
____ are also called modules, methods, functions, and subroutines.
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____ refers to the hiding of data and methods within an object.
____ refers to the hiding of data and methods within an object.
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What describes the feature of languages that allows the same word to be interpreted correctly in different situations based on the context?
What describes the feature of languages that allows the same word to be interpreted correctly in different situations based on the context?
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Given the statement: System.out.println("First Java application"); out refers to ____.
Given the statement: System.out.println("First Java application"); out refers to ____.
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______ are pieces of information that are sent into, or passed to, a method, usually because the method requires the information to perform its task or carry out its purpose.
______ are pieces of information that are sent into, or passed to, a method, usually because the method requires the information to perform its task or carry out its purpose.
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A(n) ____ defines the circumstances under which a class can be accessed and the other classes that have the right to use a class.
A(n) ____ defines the circumstances under which a class can be accessed and the other classes that have the right to use a class.
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In Java, the reserved keyword ____ means that a method is accessible and usable even though no objects of the class exist.
In Java, the reserved keyword ____ means that a method is accessible and usable even though no objects of the class exist.
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Line comments start with ____.
Line comments start with ____.
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In a ____ environment, you can change directories using the cd command.
In a ____ environment, you can change directories using the cd command.
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After a successful compile, you can run the class file on any computer that has a ____.
After a successful compile, you can run the class file on any computer that has a ____.
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Java contains a class named ____ that allows you to produce dialog boxes.
Java contains a class named ____ that allows you to produce dialog boxes.
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Whenever a method requires multiple arguments, the arguments are always separated with ____.
Whenever a method requires multiple arguments, the arguments are always separated with ____.
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If a compiler detects a violation of language rules, it refuses to translate the class to ____.
If a compiler detects a violation of language rules, it refuses to translate the class to ____.
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____ is the process the compiler uses to divide your source code into meaningful portions.
____ is the process the compiler uses to divide your source code into meaningful portions.
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A ____ is an error not detected until the program asks the computer to do something wrong, or even illegal, while executing.
A ____ is an error not detected until the program asks the computer to do something wrong, or even illegal, while executing.
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What is the simplest available text editor you should use when writing Java programs?
What is the simplest available text editor you should use when writing Java programs?
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It is a tradition among programmers that the first program you write in any language produces "____" as its output.
It is a tradition among programmers that the first program you write in any language produces "____" as its output.
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When you run...
When you run...
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Study Notes
Java Classes and Programming Concepts
- System software is not primarily for tasks like word processing or gaming; it's used for basic operations that support application software.
- The abstraction provided by an object's methods allows users to interact without needing to know low-level implementations.
- Java identifiers can consist of letters, digits, underscore (_) or dollar sign ($) but cannot contain ampersands or number signs.
- Bytecode must be translated into executable statements using the Java interpreter before running a Java application.
- The Java compiler produces error messages during compilation; running a class does not reveal compilation errors.
- Logic errors are not easily identified during compilation; they often surface during execution.
- Java programming convention suggests using uppercase letters for class identifiers to enhance readability.
- The Java compiler ignores whitespace, treating it as nonprinting characters between code elements.
- Dots in Java statements are employed to navigate between components' names, playing a critical role in object-oriented programming.
- The void keyword in the main() method indicates that no value is returned when the method is called.
- Machine language is the most basic level of programming language, functioning at the circuitry level.
- Debugging involves locating and fixing syntax errors within the source code, ensuring proper functionality.
- Procedures in Java are referred to as methods; they encapsulate specific functionality for code reuse.
- Encapsulation refers to restricting access to an object's data and methods, enhancing security and modularity in programming.
- Polymorphism allows programming constructs to be interpreted differently depending on the context, promoting flexibility.
- In Java,
System.out.printlnoutputs text to the standard output device, commonly the console. - Arguments are inputs passed to methods that enable execution of specific tasks defined by the method.
- An access specifier determines how and where a class can be accessed by other classes, impacting the application's architecture.
- The static keyword in Java denotes that a method or variable can be accessed without creating an instance of the class.
- Line comments in Java start with two forward slashes (//), offering a way to annotate code without affecting execution.
- In a DOS environment, directory navigation is performed using the
cdcommand to change directories. - A Java language interpreter allows the execution of Java bytecode on any compatible system post-compilation.
- JOptionPane is a Java class utilized for creating dialog boxes in graphical user interfaces.
- When a method accepts multiple arguments, they must be separated by commas for proper syntax.
- If the compiler encounters language rule violations, the translation to machine code is halted, and an error is reported.
- Parsing is the process by which the compiler analyzes and breaks down source code into meaningful segments.
- A run-time error occurs during program execution when the code attempts illegal operations, which were not caught at compile-time.
- Starting with the simplest available text editor is recommended for writing Java programs, ensuring ease of use.
- "Hello, world!" is traditionally the first output of a program written in any programming language, marking a rite of passage for beginners.
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Description
Prepare for your Java programming journey with these flashcards focused on creating your first Java classes. Each card provides definitions related to object-oriented programming concepts. Test your understanding of essential Java terms and concepts to enhance your learning experience.
