Training Guide ‐ Java Syntax - vinhtbkit/bkit-kb GitHub Wiki

Java is a popular programming language, created in 1995.

Target: the trainee will know how to write a simple Java function and knowledge about Types, Variables, and Operators in Java.
Expected Duration: maximum 24 hours of training and working on exercises.

Qualification criteria:

• The trainees have knowledge of Java types, variables, conditional and loop operators
• The trainees know how to create and use a Java function.
  • Specify the signature of a function
• Know how to compile and run a Java file in the command line.

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Intro to Java:

• Basics about Java
• Java versions

Setup Java environment

• Know how to install Java
  • OPTIONAL using sdkman
  • Understanding JAVA_HOME
  • Difference between JDK and JRE
  • Using multiple versions of Java on same machine
• Write a Hello World program using vi/vim/ or Visual Studio Code
• Compile and run

References

• Start with a Hellow World
• Introduction about Java
• Setup and run a Java file in the command line

Java Syntax

• Understanding basic Java syntax
• Variables
• Data types
  • Primitive: boolean, char, int, short, byte, long, float, and double
  • Non primitive: String, Array, Class, Object, Interface...
• Operators:
  • Assignment, Arithmetic, and Unary Operators
  • Equality, Relational, and Conditional Operators
  • Understand the == operator and equals method:
    • https://www.geeksforgeeks.org/difference-between-and-equals-method-in-java/
    • https://www.baeldung.com/java-equals-method-operator-difference

Naming Conventions

• Learn the naming conventions in Java

References:

• Basic syntax
  • https://www.w3schools.com/java/java_syntax.asp
  • https://www.geeksforgeeks.org/java-basic-syntax/
  • https://www.tutorialspoint.com/java/java_basic_syntax.htm
• Variables
  • https://docs.oracle.com/javase/tutorial/java/nutsandbolts/variables.html
  • https://www.geeksforgeeks.org/variables-in-java/?ref=lbp
  • https://www.tutorialspoint.com/Final-static-variables-in-Java
  • https://www.geeksforgeeks.org/variable-scope-in-java/?ref=lbp
• Data types
  • https://www.geeksforgeeks.org/data-types-in-java/?ref=lbp
  • https://docs.oracle.com/javase/tutorial/java/nutsandbolts/datatypes.html
  • https://www.w3schools.com/java/java_type_casting.asp
  • https://www.geeksforgeeks.org/primitive-data-type-vs-object-data-type-in-java-with-examples/?ref=lbp
  • String in Java: https://www.geeksforgeeks.org/strings-in-java/
  • https://www.geeksforgeeks.org/wrapper-classes-java/?ref=lbp
• Operators
  • https://docs.oracle.com/javase/tutorial/java/nutsandbolts/operators.html
  • https://www.geeksforgeeks.org/operators-in-java/?ref=lbp
• Flows and expressions
  • https://docs.oracle.com/javase/tutorial/java/nutsandbolts/flow.html
  • https://docs.oracle.com/javase/tutorial/java/nutsandbolts/expressions.html
• Naming convetions
  • geekforgeeks: Naming Conventions

Quizzes:

• How to compile a Java file?
• How to run a Java bytecode file?
• Different between a .class file and .java file?
• What is the responsibility of the public static void main(String[] args) function?
• How many primitive types does Java have? List them.
• What is the special of String type?

Assignments:

Requires:

Java 11 or higher, Using the command line to compile and run a Java file.

Exercise:

1. Write a small program to calculate the sum of array integer numbers inputted from the command line. Ex: input: 1,2,3,4,5 -> you need to split the string by , to get an array integer number.

java Sum 1,2,3,4,5
> 15

2. Write a small program to count words (not numbers) from a string inputted from the command line.

java CountWords "Hello World"
> 11

*Note: The user input will be obtained from the args parameter of the public static void main(String[] args).