Podcast
Questions and Answers
Within the CPU, what are the primary functional units responsible for processing?
Within the CPU, what are the primary functional units responsible for processing?
- Control Unit and Main Memory
- Control Unit and Arithmetic/Logic Unit (ALU) (correct)
- Input and Output Devices
- Arithmetic/Logic Unit (ALU) and Main Memory
In object-oriented programming, what principle allows external code to interact with an object's data?
In object-oriented programming, what principle allows external code to interact with an object's data?
- Bypassing Encapsulation
- Direct Data File Manipulation
- Access to Private Data Members
- Interaction Through Methods (correct)
Why are compiled Java programs considered highly portable?
Why are compiled Java programs considered highly portable?
- They must be re-compiled for each different machine.
- They are non-existent.
- Java byte code is the same across all computers. (correct)
- They cannot run on computers with different operating systems.
What is the role of the Java Virtual Machine (JVM) in executing byte code?
What is the role of the Java Virtual Machine (JVM) in executing byte code?
Which programming paradigm emphasizes the creation of reusable software entities containing data and methods?
Which programming paradigm emphasizes the creation of reusable software entities containing data and methods?
How many bits are commonly found within a single byte?
How many bits are commonly found within a single byte?
What is the fundamental purpose of a computer program?
What is the fundamental purpose of a computer program?
Given the necessity to display 'Loading Complete' on the console, which Java command would achieve this?
Given the necessity to display 'Loading Complete' on the console, which Java command would achieve this?
What happens to variables declared within a method?
What happens to variables declared within a method?
Which Javadoc tag is used to provide a description for a method's parameter?
Which Javadoc tag is used to provide a description for a method's parameter?
Which Javadoc tag is used to document the return value of a method?
Which Javadoc tag is used to document the return value of a method?
What requirement applies to a method that calls another method which has a throws clause in its header?
What requirement applies to a method that calls another method which has a throws clause in its header?
Where is the receiving parameter variable declared when an argument value is passed to a method?
Where is the receiving parameter variable declared when an argument value is passed to a method?
Given the method header public void displayValue(int value) within class A, which of the following code segments in another method of class A contains a legal call to displayValue?
Given the method header public void displayValue(int value) within class A, which of the following code segments in another method of class A contains a legal call to displayValue?
All @param tags in a method's Javadoc documentation must ________.
All @param tags in a method's Javadoc documentation must ________.
When an object (e.g., a String) is passed as an argument to a method, what is actually passed?
When an object (e.g., a String) is passed as an argument to a method, what is actually passed?
Which of the following is essential for a valid Java program?
Which of the following is essential for a valid Java program?
To compile a Java program named Application, which command should be used?
To compile a Java program named Application, which command should be used?
What is the result of executing the following code snippet?
int x = 8, y = 33;
double z;
z = (double) (y / x);
What is the result of executing the following code snippet?
int x = 8, y = 33;
double z;
z = (double) (y / x);
What is the term for the action of the + operator when used with String operands?
What is the term for the action of the + operator when used with String operands?
What will be the displayed output of the following code?
int a = 15, b = 6;
System.out.printf("%d %d", a, b);
What will be the displayed output of the following code?
int a = 15, b = 6;
System.out.printf("%d %d", a, b);
What is the final value of result after executing the following code?
int result = 10, x = 50, y = 40;
if (x < y) {
result = x + 5;
x -= y;
} else {
result = y + 5;
y += x;
}
What is the final value of result after executing the following code?
int result = 10, x = 50, y = 40;
if (x < y) {
result = x + 5;
x -= y;
} else {
result = y + 5;
y += x;
}
A __________ is a variable, typically of boolean type, used to indicate whether a specific condition has occurred within a program.
A __________ is a variable, typically of boolean type, used to indicate whether a specific condition has occurred within a program.
What is the required evaluation of the boolean expression within an if statement?
What is the required evaluation of the boolean expression within an if statement?
When comparing character values in a switch statement, is the case of the character considered?
When comparing character values in a switch statement, is the case of the character considered?
What will be the value of num after the execution of the following code snippet?
int num = 20;
num += 10;
num -= 5;
What will be the value of num after the execution of the following code snippet?
int num = 20;
num += 10;
num -= 5;
What will be the final value of counter after the execution of the given code block?
int counter = 100;
while (counter < 105) {
counter += 2;
}
What will be the final value of counter after the execution of the given code block?
int counter = 100;
while (counter < 105) {
counter += 2;
}
A ________ is a specific value that indicates the end of a list of values or a sequence.
A ________ is a specific value that indicates the end of a list of values or a sequence.
A loop structure designed to repeat a block of code a predetermined number of times is known as a(n) _______ loop.
A loop structure designed to repeat a block of code a predetermined number of times is known as a(n) _______ loop.
Given PrintWriter writer = new PrintWriter("output.txt");, which statement correctly writes the string "Success" to the file output.txt?
Given PrintWriter writer = new PrintWriter("output.txt");, which statement correctly writes the string "Success" to the file output.txt?
Which of the following loop types always executes at least once?
Which of the following loop types always executes at least once?
Flashcards
CPU Main Parts
CPU Main Parts
The CPU has two main parts: the control unit, which manages operations, and the arithmetic/logic unit (ALU), which performs calculations.
Object Access
Object Access
Objects hide their internal data but provide access through methods.
Java Portability
Java Portability
Compiled Java programs are highly portable because Java byte code is the same on all computers.
Java File Extension
Java File Extension
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Byte Code
Byte Code
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Encapsulation
Encapsulation
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Programming Styles
Programming Styles
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Bits in a Byte
Bits in a Byte
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Local Variable Scope
Local Variable Scope
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@param tag
@param tag
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@return tag
@return tag
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Exception Handling Requirement
Exception Handling Requirement
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Parameter Declaration
Parameter Declaration
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Passing Objects as Arguments
Passing Objects as Arguments
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Returning Object References
Returning Object References
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@param Tag Placement
@param Tag Placement
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JShell
JShell
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var keyword
var keyword
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String Concatenation
String Concatenation
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Class Definition
Class Definition
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Type Casting
Type Casting
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javac First.java
javac First.java
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printf format specifier
printf format specifier
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AND expression
AND expression
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if statement
if statement
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Flag Variable
Flag Variable
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Boolean Expression
Boolean Expression
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Sentinel Value
Sentinel Value
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Count Controlled Loop
Count Controlled Loop
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do-while loop
do-while loop
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Local Variables
Local Variables
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Study Notes
- The central processing unit (CPU) consists of the control unit and the arithmetic/logic unit (ALU).
- An object typically hides its data but allows outside code access to the methods that operate on the data.
- Compiled Java programs are highly portable because Java byte code is the same on all computers.
- Java source files end with the .java extension.
- Byte code instructions are read and interpreted by the JVM.
- Encapsulation combines data and code into a single object.
- Procedural programming is centered on creating procedures, while object-oriented programming is centered on creating objects.
- There are 8 bits in a byte.
- A computer program is a set of instructions that allow the computer to solve a problem or perform a task.
- System.out.println("Hello, world"); prints "Hello, world" on the monitor.
- Demo.class would contain the translated Java byte code for a program named Demo.
- A Java program must have at least one class definition.
- To compile a program named First the command is javac First.java.
- All it takes for an AND expression to be true is for one of the subexpressions to be true.
- The if statement creates a decision structure which allows a program to have more than one path of execution.
- A flag is a boolean variable that signals when some condition exists in the program.
- String.format method works exactly like the System.out.printf method, except that it does not display the formatted string on the screen.
- The switch expression in the following statement is written correctly: message = switch(statusCode){ case 200 -> statusType = "OK"; default -> statusType = "Unknown"; };
- The boolean expression in an if statement must evaluate to true or false.
- When testing for character values, the switch statement does not test for the case of the character.
- A sentinel is a value that signals when the end of a list of values has been reached.
- A loop that repeats a specific number of times is known as a count-controlled loop.
- The do-while loop must be terminated with a semicolon.
- Values stored in local variables are lost between calls to the method in which they are declared.
- To document the return value of a method you can use a @return tag.
- Any method that calls a method with a throws clause in its header must either handle the potential exception or have the same throws clause.
- When an argument value is passed to a method, the receiving parameter variable is declared in the method header inside the parentheses.
- When an object, such as a String, is passed as an argument it is actually a reference to the object that is passed.
- A value-returning method can return a reference to a non-primitive type.
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Description
This lesson introduces basic computing concepts in Java. It covers CPU structure, object-oriented principles like encapsulation, and the role of JVM in Java's portability. It also touches on program compilation and basic syntax.
