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Java

Java is a high-level, object-oriented language known for its portability and reliability. Mastering Java is key for developers to build scalable, secure software efficiently.

In this course, you will start by mastering the art of problem-solving with simple Java programs, such as the Bottle Filling example. You will learn how to structure your solutions, create execution sheets, and enhance your problem-solving abilities through practical exercises and quizzes. Progressing further, you will learn decision-making and branching in Java, understanding flowcharts, conditional expressions, and their application. You will also learn about Java basics, including the first Java program, fundamentals, conditional statements, and error categories, followed by in-depth lessons on working with Java strings and arrays. 

By the end of this course, you will have a solid understanding of Java programming fundamentals and the ability to solve real-world problems using Java.

Learn to Code: Java for Absolute Beginners

The two-way decision has a true branch and a false branch.


The one-way decision has a true branch and a false branch.


The two-way decision has a branch labeled with `else`.


The one-way decision has a branch labeled with `else`.


**(Select all that apply.)** Which of the following statements are true?


(Select all that apply.) Which of the following statements are true?

Let’s say we have two integers input by the user in the variables `p` and `q`. Which of the following conditional expressions shows that `p` is a _multiple of_ `q`? 

(A number is a multiple of another number if its division gives an integer result.)



Let’s say we have two integers input by the user in the variables <code>p</code> and <code>q</code>. Which of the following conditional expressions shows that <code>p</code> is a multiple of <code>q</code>?
(A number is a multiple of another number if its division gives an integer result.)

**(Select all that apply.)** Let’s say we have an integer input by the user in the variable `num`. Which of the following conditional expressions show whether the integer is an odd number?

The rule is that a natural number not divisible by 2 is an _odd_ number.

(Select all that apply.) Let’s say we have an integer input by the user in the variable <code>num</code>. Which of the following conditional expressions show whether the integer is an odd number?
The rule is that a natural number not divisible by 2 is an odd number.

**(Select all that apply.)** Let’s say we have an integer input by the user in the variable `num`. Which of the following are the correct conditional expressions that show that the integer is a _multiple of $4$_?

(We know that a multiple of $4$ is always an _even_ number.)


(Select all that apply.) Let’s say we have an integer input by the user in the variable <code>num</code>. Which of the following are the correct conditional expressions that show that the integer is a multiple of <math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mn>4</mn></mrow><annotation encoding="application/x-tex">4</annotation></semantics></math>4?
(We know that a multiple of <math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mn>4</mn></mrow><annotation encoding="application/x-tex">4</annotation></semantics></math>4 is always an even number.)

**(Select all that apply.)** Let’s say we have an integer input by the user in the variable `num`. Our program calculates and stores the number of factors of `num` to another variable, `nfact`. Which of the following conditional expressions show that the integer is _not_ a prime number?

The rule is that a number is prime if it is divisible only by itself and by 
$1$.


(Select all that apply.) Let’s say we have an integer input by the user in the variable <code>num</code>. Our program calculates and stores the number of factors of <code>num</code> to another variable, <code>nfact</code>. Which of the following conditional expressions show that the integer is not a prime number?
The rule is that a number is prime if it is divisible only by itself and by
<math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mn>1</mn></mrow><annotation encoding="application/x-tex">1</annotation></semantics></math>1.

`n % 2 == 1 AND n % 3 == 1 AND n % 4 == 1 AND n % 5 == 1 AND n % 6 == 1 AND n % 7 == 0`


`n % 2 == 1 OR n % 3 == 1 OR n % 4 == 1 OR n % 5 == 1 OR n % 6 == 1 AND n % 7 == 0`

`n % 2 == 1 OR n % 3 == 1 OR n % 4 == 1 OR n % 5 == 1 OR n % 6 == 1 OR n % 7 == 0`

`n % 2 == 1 AND n % 3 == 1 AND n % 4 == 1 AND n % 5 == 1 AND n % 6 == 1 OR n % 7 == 0`

When distributing `n`  number of coins among $2$, $3$, $4$, $5$, or $6$ persons, $1$ coin is left over. But when distributed among $7$ persons, they are distributed equally. Which of the following conditional expressions correctly tests the value of `n`?


When distributing <code>n</code> number of coins among <math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mn>2</mn></mrow><annotation encoding="application/x-tex">2</annotation></semantics></math>2, <math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mn>3</mn></mrow><annotation encoding="application/x-tex">3</annotation></semantics></math>3, <math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mn>4</mn></mrow><annotation encoding="application/x-tex">4</annotation></semantics></math>4, <math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mn>5</mn></mrow><annotation encoding="application/x-tex">5</annotation></semantics></math>5, or <math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mn>6</mn></mrow><annotation encoding="application/x-tex">6</annotation></semantics></math>6 persons, <math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mn>1</mn></mrow><annotation encoding="application/x-tex">1</annotation></semantics></math>1 coin is left over. But when distributed among <math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mn>7</mn></mrow><annotation encoding="application/x-tex">7</annotation></semantics></math>7 persons, they are distributed equally. Which of the following conditional expressions correctly tests the value of <code>n</code>?

Test your knowledge of decisions and branching.

About the Course

Problem Solving with Simple Programs

Decisions and Branching

Java Basics

Repetition with Loops

Strings and Arrays

Methods

Appendix - Complex Programs

Wrap Up

Quiz on Decisions and Branching