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Ch. 2 – Java Fundamentals – Flashcards

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8 July 2022

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question

Which one of the following would contain the translated Java byte code for a program named Demo?

answer

Demo.class

question

To compile a program named First, use the following command:

answer

javac First.java

question

A Java program must have at least one of these:

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Class definition

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In Java, the beginning of a comment is marked with:

answer

question

The term ___________ typically refers to the device that displays console output.

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Standard output device

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In Java, ___________ must be declared before they can be used.

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Variables

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This is a value that is written into the code of a program

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Literal

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When the (+) operator is used with strings, it is known as the:

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String concatenation operator

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Which of the following is NOT a rule that must be followed when naming identifiers?

answer

Identifiers can contain spaces.

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Which of the following cannot be used as identifiers in Java?

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Key words

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In Java, it is standard practice to capitalize the first letter of:

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Class names

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Which of the following is not a primitive data type?

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String

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Which of the following is valid?

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float w; w = 1.0*f*;

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The boolean data type may contain values in the following range of values:

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True or False

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Character literals are enclosed in _____; string literals are enclosed in _____.

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Single quotes; Double quotes

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What is the result of the following expression? 10 + 5 * 3 - 20

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question

What is the result of the following expression? 25 / 4 + 4 * 10 % 3

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question

In the following Java statement what value is stored in the variable name? String name = "John Doe";

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The memory address where "John Doe" is located

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Which of the following is not a valid comment statement?

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**/ comment 3 /**

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When saving a Java source file, save it with an extension of:

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.java

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Every Java application program must have:

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a method named "main"

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To print "Hello, world" on the monitor, use the following Java statement:

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System.out.println("Hello, world");

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To display the output on the next line, you can use the println method or use this escape sequence in the print method.

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question

This is a named storage location in the computer's memory.

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Variable

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Variables are classified according to their:

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Data type

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The primitive data types only allow a(n) _____ to hold a single value.

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Variable

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If x has been declared an int, which of the following statements is invalid?

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x = 1,000; *NO COMMAS!*

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Given the declaration double r;, which of the following statements is invalid?

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r = 2.9X106;

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Variables of the boolean data type are useful for:

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Evaluating true/false conditions

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What is the result of the following expression? 25 - 7 * 3 + 12 / 3

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question

What is the result of the following expression? 17 % 3 * 2 - 12 + 15

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This is a variable whose content is read only and cannot be changed during the program's execution.

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Named constant

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Which of the following is a valid Java statement?

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String str = "John Doe";

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Which of the following does NOT describe a valid comment in Java?

answer

Multi-line comments, start with **/ and end with /**

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Which of the following statements correctly creates a Scanner object for keyboard input?

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Scanner keyboard = new Scanner(System.in);

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Which Scanner class method reads an int?

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nextInt()

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Which Scanner class method reads a String?

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nextLine()

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Which one of the following methods would you use to convert a string to a double?

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Double.ParseDouble

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TRUE/FALSE: A Java program will not compile unless it contains the correct line numbers.

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False

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TRUE/FALSE: All Java statements end with semicolons.

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False

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TRUE/FALSE: Java is a case-insensitive language.

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False

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TRUE/FALSE: Although the dollar sign is a legal identifier character, you should not use it because it is normally used for special purposes.

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True

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TRUE/FALSE: Assuming that pay has been declared a double, the following statement is valid. pay = 2,583.44;

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False

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TRUE/FALSE: Named constants are initialized with a value, that value cannot be changed during the execution of the program.

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True

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TRUE/FALSE: A variable's scope is the part of the program that has access to the variable.

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True

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TRUE/FALSE: In Java the variable named total is the same as the variable named Total.

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False

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TRUE/FALSE: Class names and key words are examples of variables.

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False

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TRUE/FALSE: Both character literals and string literals can be assigned to a char variable.

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False

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TRUE/FALSE: If the compiler encounters a statement that uses a variable before the variable is declared, an error will result.

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True

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TRUE/FALSE: Programming style includes techniques for consistently putting spaces and indentation in a program so visual cues are created.

answer

True

Ch. 2 – Java Fundamentals – Flashcards

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