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Questions and Answers
What is the purpose of a Conditional Statement?
What is the purpose of a Conditional Statement?
- To declare a variable and assign a value
- To iterate through an array and perform an action
- To compare two values and perform an action (correct)
- To print output to the screen
What is the function of the 'break' keyword?
What is the function of the 'break' keyword?
- To declare a new variable
- To continue to the next iteration of a loop
- To exit a switch statement or loop (correct)
- To print output to the screen
What type of statement handles two conditional expressions?
What type of statement handles two conditional expressions?
- Switch statement
- While loop
- If statement
- If-else statement (correct)
What is the purpose of a 'default' keyword in a switch statement?
What is the purpose of a 'default' keyword in a switch statement?
What is the purpose of the 'while' loop?
What is the purpose of the 'while' loop?
What does the 'if' statement handle?
What does the 'if' statement handle?
What is the term for reading every element inside an array and performing an action?
What is the term for reading every element inside an array and performing an action?
What is the purpose of the 'switch' statement?
What is the purpose of the 'switch' statement?
What is the purpose of the Equals Function in comparing strings?
What is the purpose of the Equals Function in comparing strings?
What is the main difference between a While Loop and a Do-While Loop?
What is the main difference between a While Loop and a Do-While Loop?
What is the purpose of the length variable in an array?
What is the purpose of the length variable in an array?
What is the characteristic of a For-Each Loop?
What is the characteristic of a For-Each Loop?
What is the purpose of a Switch Statement?
What is the purpose of a Switch Statement?
What is a common use of For Loops?
What is a common use of For Loops?
What is the syntax of a For Loop?
What is the syntax of a For Loop?
What is a characteristic of a Nested Conditional Statement?
What is a characteristic of a Nested Conditional Statement?
What is the purpose of the Scanner class in Java?
What is the purpose of the Scanner class in Java?
Which of the following identifiers is not valid?
Which of the following identifiers is not valid?
What is the data type of a variable that holds a set of characters or text?
What is the data type of a variable that holds a set of characters or text?
How do you declare an array with values in Java?
How do you declare an array with values in Java?
What is the purpose of an index in an array?
What is the purpose of an index in an array?
Which of the following data types can be used with the equality operator?
Which of the following data types can be used with the equality operator?
How do you access an array element in Java?
How do you access an array element in Java?
What is the purpose of the CASE statement in Java?
What is the purpose of the CASE statement in Java?
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Study Notes
Java Conditional Statements
- Conditional statements allow a program to take action based on a given condition.
- They typically compare two values to decide what action to take.
If Statement
- Handles one conditional expression.
- Executes a code block if the condition is true, otherwise does nothing.
If-Else Statement
- Handles two conditional expressions.
- Executes the first code block if the condition is true, otherwise executes the second code block.
Switch Statement
- Similar to a conditional statement, but only checks for specific values.
- Used to handle multiple values using the
casekeyword. - Typically used with a
defaultkeyword to handle values not on a case.
Loops
- While Loop: Used to execute a code block repeatedly while a condition is met.
- Do-While Loop: Similar to a while loop, but executes the code block first before checking the condition.
- For Loop: Used to execute a code block repeatedly while a condition is met, with a more compact format than a while loop.
- For-Each Loop: Used to iterate through collections like arrays easily without knowing the size of the collection.
Arrays
- A collection of multiple values in a single variable with the same data type.
- Governed by using an index.
- Elements are individual values in an array.
- Declaring arrays:
datatype identifier[] = {val1,val2,val3};ordatatype identifier[] = new datatype[size];. - Accessing arrays:
identifier[index]. - Assigning array elements:
identifier[index] = value.
Data Types
- String: Holds a set of characters or text.
- Boolean: Holds true or false values.
- Integers: byte, short, int, long.
- Floating Point: float, double.
Methods and Functions
- A block of code that can be called multiple times.
- Used to perform specific tasks.
Identifiers and Variables
- Identifiers are names of variables indicated by the programmer.
- Rules of identifiers: cannot use special characters, whitespaces, or numbers alone.
- Declaring variables:
datatype identifier.
Input and Output
- User Input: Using a
Scannerobject to read user input. - Output: Using
System.out.println()to print output.
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