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‎section-01-java-fundamentals/demo/.gitignore

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target/
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!.mvn/wrapper/maven-wrapper.jar
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!**/src/main/**/target/
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!**/src/test/**/target/
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### IntelliJ IDEA ###
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.idea/modules.xml
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.idea/jarRepositories.xml
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.idea/compiler.xml
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.idea/libraries/
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*.iws
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*.iml
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*.ipr
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### Eclipse ###
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.apt_generated
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.classpath
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.factorypath
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.project
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.settings
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.springBeans
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.sts4-cache
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### NetBeans ###
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/nbproject/private/
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/nbbuild/
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/dist/
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/nbdist/
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/.nb-gradle/
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build/
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!**/src/main/**/build/
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!**/src/test/**/build/
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### VS Code ###
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.vscode/
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### Mac OS ###
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.DS_Store

‎section-01-java-fundamentals/demo/pom.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>org.example</groupId>
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<artifactId>demo</artifactId>
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<version>1.0-SNAPSHOT</version>
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<properties>
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<maven.compiler.source>22</maven.compiler.source>
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<maven.compiler.target>22</maven.compiler.target>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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</properties>
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</project>

‎section-01-java-fundamentals/demo/src/main/java/CastingDemo.java

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public class CastingDemo {
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public static void main(String[] args) {
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// convert double to int
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double theDoubleGradeAvg = 89.70;
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int theIntGradeAvg = (int) theDoubleGradeAvg;
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System.out.println("theDoubleGradeAvg=" + theDoubleGradeAvg);
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System.out.println("theIntGradeAvg=" + theIntGradeAvg);
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// convert float to byte
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float theFloatDistance = 123.60f;
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byte theByteDistance = (byte) theFloatDistance;
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System.out.println("theFloatDistance=" + theFloatDistance);
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System.out.println("theByteDistance=" + theByteDistance);
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// convert int to char
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int theCharacterCode = 65;
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char theChar = (char) theCharacterCode;
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System.out.println("theCharacterCode=" + theCharacterCode);
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System.out.println("theChar=" + theChar);
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// convert String to int
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int count = Integer.parseInt("49");
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System.out.println("count=" + count);
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}
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}
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‎section-01-java-fundamentals/demo/src/main/java/Demo.java

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public class Demo {
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public static void main(String[] args) {
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// add our code here
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System.out.println("Hello World of Java!");
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System.out.println("My favorite color is blue.");
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System.out.println("My hobby is coding.");
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}
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}

‎section-01-java-fundamentals/demo/src/main/java/NumberDemo.java

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public class NumberDemo {
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public static void main(String[] args) {
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double gradeExam1 = 87.5;
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double gradeExam2 = 100.0;
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double gradeExam3 = 66.50;
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double gradeAverage = (gradeExam1 + gradeExam2 + gradeExam3) / 3;
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System.out.println("Grade exam 1: " + gradeExam1);
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System.out.println("Grade exam 2: " + gradeExam2);
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System.out.println("Grade exam 3: " + gradeExam3);
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System.out.println("Grade average: " + gradeAverage);
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// format the output
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String formattedAvg = String.format("%.2f", gradeAverage);
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System.out.println("Formatted average: " + formattedAvg);
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}
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}
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‎section-01-java-fundamentals/demo/src/main/java/NumberInputDemo.java

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import java.util.Scanner;
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public class NumberInputDemo {
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public static void main(String[] args) {
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Scanner scanner = new Scanner(System.in);
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System.out.print("Enter grade exam 1: ");
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double gradeExam1 = scanner.nextDouble();
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System.out.print("Enter grade exam 2: ");
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double gradeExam2 = scanner.nextDouble();
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System.out.print("Enter grade exam 3: ");
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double gradeExam3 = scanner.nextDouble();
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double gradeAverage = (gradeExam1 + gradeExam2 + gradeExam3) / 3;
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System.out.println("Grade exam 1: " + gradeExam1);
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System.out.println("Grade exam 2: " + gradeExam2);
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System.out.println("Grade exam 3: " + gradeExam3);
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System.out.println("Grade average: " + gradeAverage);
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// format the output
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String formattedAvg = String.format("%.2f", gradeAverage);
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System.out.println("Formatted average: " + formattedAvg);
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scanner.close();
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}
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}
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‎section-01-java-fundamentals/demo/src/main/java/StringDemo.java

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public class StringDemo {
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public static void main(String[] args) {
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/*
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var message = "Hello World!";
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var extra = "I love to code!";
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*/
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String message = "Hello World!";
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String extra = "I love to code!";
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System.out.println(message + " " + extra);
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System.out.println("Length of " + message + " is " + message.length());
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System.out.println("Upper case version of " + message + " is " + message.toUpperCase());
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System.out.println("Lower case version of " + message + " is " + message.toLowerCase());
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String combo = message + " " + extra;
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System.out.println("Combo: " + combo);
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String upperVersion = combo.toUpperCase();
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System.out.println("Upper version: " + upperVersion);
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}
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}
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‎section-01-java-fundamentals/demo/src/main/java/StringInputDemo.java

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import java.util.Scanner;
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public class StringInputDemo {
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public static void main(String[] args) {
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// Create a scanner for reading input from the user
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Scanner scanner = new Scanner(System.in);
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// prompt the user
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System.out.print("What is your favorite color? ");
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// read the input from the user
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String theColor = scanner.nextLine();
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// prompt the user
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System.out.print("What is your hobby? ");
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// read the input from the user
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String theHobby = scanner.nextLine();
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System.out.println("Your favorite color is " + theColor);
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System.out.println("Your hobby is " + theHobby);
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// close to release resources and prevent resource/memory leaks
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scanner.close();
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}
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}
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‎section-01-java-fundamentals/helloworld/.gitignore

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target/
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!.mvn/wrapper/maven-wrapper.jar
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!**/src/main/**/target/
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!**/src/test/**/target/
5+
6+
### IntelliJ IDEA ###
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.idea/modules.xml
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.idea/jarRepositories.xml
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.idea/compiler.xml
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.idea/libraries/
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*.iws
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*.iml
13+
*.ipr
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15+
### Eclipse ###
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.apt_generated
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.classpath
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.factorypath
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.project
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.settings
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.springBeans
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.sts4-cache
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### NetBeans ###
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/nbproject/private/
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/nbbuild/
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/dist/
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/nbdist/
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/.nb-gradle/
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build/
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!**/src/main/**/build/
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!**/src/test/**/build/
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### VS Code ###
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.vscode/
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### Mac OS ###
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.DS_Store

‎section-01-java-fundamentals/helloworld/pom.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>org.example</groupId>
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<artifactId>helloworld</artifactId>
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<version>1.0-SNAPSHOT</version>
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<properties>
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<maven.compiler.source>22</maven.compiler.source>
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<maven.compiler.target>22</maven.compiler.target>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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</properties>
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</project>

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