Java Control Statements Quiz

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Questions and Answers

What will be printed when the variable 'number' is set to 20 in the given switch case example?

20 (correct)

Not in 10, 20 or 30

What is the purpose of the 'break' statement in a switch case?

To exit the program

To execute the next case

To allow fall-through behavior

To terminate the switch case execution (correct)

What will the output be if the variable 'number' is 14 in the IfElseExample class?

odd number

even

even number (correct)

Error: variable not defined

If no case matches in a switch statement, which statement will be executed?

The default case statement Signup and view all the answers

What will the output be when 'studentGrade' is 75 in the nested if statement?

C Signup and view all the answers

What happens if a break statement is omitted in a switch case?

All cases will be executed until a break statement is found Signup and view all the answers

In the provided Java code, which operator checks if a number is even?

% Signup and view all the answers

Which of the following is NOT a valid type for a switch expression in Java?

boolean Signup and view all the answers

What issue does the dangling-else problem relate to in nested if statements?

Determining which else belongs to which if Signup and view all the answers

Which output occurs if studentGrade is less than 60 in the nested if statement?

F Signup and view all the answers

What data type is the variable 'number' in the IfElseExample class?

int Signup and view all the answers

What will the output be if the variable 'studentGrade' is 89?

B Signup and view all the answers

What does the expression 'number%2==0' evaluate in the context of the if statement?

Checks if 'number' is even Signup and view all the answers

What is the primary function of the 'main' method in a Java application?

To initiate the execution of the program Signup and view all the answers

Which command is used to compile a Java program?

javac Welcome1.java Signup and view all the answers

What happens if there are no errors during the compilation of a Java application?

A .class file containing bytecode is created. Signup and view all the answers

In the example provided, which statement correctly prints to the console?

System.out.print(Welcome to Java Programming!); Signup and view all the answers

What is included in the bytecode produced after compiling a Java application?

Instructions for the Java interpreter Signup and view all the answers

What keyword is used to define a class in Java?

class Signup and view all the answers

Which of the following describes the 'Welcome1' class in the example?

A public class containing the main execution method Signup and view all the answers

What is the purpose of the 'static' keyword in the main method declaration?

It allows the method to be called without creating an instance of the class. Signup and view all the answers

What will be the output of the switch statement in the SwitchExample2 class when the variable number is set to 20?

Not in 10, 20 or 30 Signup and view all the answers

In the switch case of the Test class, which case is missing a break statement?

case 'D' Signup and view all the answers

What keyword is used in the switch statement to exit a case once it has been executed?

break Signup and view all the answers

In the context of the conditional operator, which expression evaluates to the largest number between x, y, and z in the LargestNumberExample class?

x > y ? x : (y > z ? y : z) Signup and view all the answers

In a switch statement, which of the following types cannot be used as the switch expression?

float Signup and view all the answers

What is a potential issue with the switch statement in the SwitchExample2 class?

There are missing break statements. Signup and view all the answers

What will the output be for the test case of grade 'C' in the Test class?

Well done Signup and view all the answers

Which part of a switch statement is executed when none of the cases match the switch expression?

default Signup and view all the answers

Study Notes

Java Study Notes

This document is a summary and review of Java.
It's not a replacement for the original material, it's for review only.
Compiled from lecture notes and other related sources.
Resources are available at https://t.me/computingg, @mimbaj, and @otfhh91
Includes material from various parts of the course.
Divided into weeks.

Week 3: Introduction to Java Applications I

A Java application runs when launched using the Java Virtual Machine (JVM).
A basic Java program (e.g., Welcome1.java) demonstrates displaying text output.
The program compiles using javac Welcome1.java into a .class file.
Then it runs using java Welcome1, and displays to the command prompt.

Week 3: Introduction to Java Applications II

Modifying the first Java program can alter output using multiple System.out.print and System.out.println statements.
Displaying multiple lines in a single output statement is possible.
A single-line output can be formatted using the System.out.printf method.

Week 4: Introduction to Java Applications II

Equality and relational operators are used for comparisons in Java (==, >, <, <=, >=, !=).
Output examples demonstrate how these operators return true or false based on the comparison.
Increment and decrement operators (++, --) increase or decrease the value of a variable before or after its use in an expression, with either pre or post increment.

Week 5: Control Statements I

If statements control program flow based on conditions.
If-else statements add an alternative block of code to be executed if the condition is false.
Nested if statements can have multiple layers of conditional checks.
The dangling else problem is avoided by correct placement of braces for code blocks.

Week 5: Control Statements II

Switch-case statements provide a way to conditionally execute code blocks based on an input value.
Multiple cases can be part of the switch.

Week 7+8: Methods

Methods are blocks of code with specific tasks or functions, called to perform those tasks.
sum method demonstrates calculation and return of an integer.
Predefined methods (or built-in methods) are from Java libraries.

Week 10: Arrays

Arrays store multiple data items of the same type.
Arrays have a fixed size when created.
Arrays use index values to access elements, an integer greater or equal to zero.

Week 11+12: Classes and Objects

A class is a blueprint or template for creating objects.
Objects have common properties and behaviors.
Objects can have instance variables or methods.

Week 13: Inheritance & Polymorphism

Inheritance is a mechanism for creating new classes (subclasses) from existing ones (superclasses).
Subclasses inherit properties and methods from superclasses.
Polymorphism is the ability to use objects in different ways with the same method name, based on which class is used.

Week 14: Strings and Characters

Characters are fundamental building blocks.
Java strings are represented by the String class.

Week 15: Recursion

Recursive methods can call themselves to solve a problem by breaking it down into smaller, repetitive cases.
There is a base case, and recursive step.

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Description

Test your knowledge on Java control statements including switch cases and if-else statements with this quiz. Explore questions about break statements, data types, and the logic behind outputs in various scenarios. Ideal for understanding Java programming concepts effectively.