24 Questions
What is the purpose of a Conditional Statement?
To compare two values and perform an action
What is the function of the 'break' keyword?
To exit a switch statement or loop
What type of statement handles two conditional expressions?
If-else statement
What is the purpose of a 'default' keyword in a switch statement?
To handle values that are not listed in the case
What is the purpose of the 'while' loop?
To run a block of code repeatedly while a condition is true
What does the 'if' statement handle?
One conditional expression
What is the term for reading every element inside an array and performing an action?
Iterating arrays
What is the purpose of the 'switch' statement?
To compare two values and take action
What is the purpose of the Equals Function in comparing strings?
To compare the content of strings efficiently
What is the main difference between a While Loop and a Do-While Loop?
A Do-While Loop executes the code block first, then checks the condition
What is the purpose of the length variable in an array?
To find the size of the array
What is the characteristic of a For-Each Loop?
It is used to iterate through arrays without knowing the size of the collection
What is the purpose of a Switch Statement?
To check for specific values of a variable
What is a common use of For Loops?
To iterate through collections like arrays
What is the syntax of a For Loop?
for (initialization; condition; operation) { code block }
What is a characteristic of a Nested Conditional Statement?
It can be any type of conditional statement
What is the purpose of the Scanner class in Java?
To read user input
Which of the following identifiers is not valid?
my variable
What is the data type of a variable that holds a set of characters or text?
String
How do you declare an array with values in Java?
datatype identifier[] = {val1, val2, val3}
What is the purpose of an index in an array?
To represent a position in the array
Which of the following data types can be used with the equality operator?
String, Char, Int, and Enums
How do you access an array element in Java?
identifier[index]
What is the purpose of the CASE statement in Java?
To define a case in a switch statement
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.
This quiz covers conditional statements in Java, including IF statements and their use in programming. It explains how conditional statements allow programs to take action based on given conditions.
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