Java Fundamentals
Course
Module 2
What is a computer
program?
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hello world program in java, Slides of Java Programming
This PowerPoint walks through how to create a simple "Hello World" program in Java. It's perfect for someone completely new to Java programming. It includes: What a Hello World program is and why it's useful Setting up a Java development environment Java main method and class structure Syntax of a Hello World program Explaining each line of code Compiling and running the program Common errors and fixes Extra practices and activities The presentation contains slides explaining each step in detail along with code examples, diagrams, and screenshots. It covers the foundation you need to create your first Java program.
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2022/2023
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Java Fundamentals
Course
Module 2
What is a computer
program?
What is a computer program?
● (^) A computer program is a list of instructions that tells a computer what to do. ● (^) Everything a computer does is done by using a computer program. ● (^) A computer program is written in a programming language like C, C++, Java, etc.
Building our first program
● (^) We need a way to display something on the screen. Right? ● (^) The command used to print some text on the screen is: ● (^) System.out.print ● (^) Note that Java is a case sensitive language, meaning that uppercase letters and lowercase letters are different for it. ● (^) So, capital ‘S’ must be capital or else the computer will not be able to understand the command.
● (^) Now, you must be wondering, how do we tell the computer to print some specific text on the screen? ● (^) So, to achieve this, you need open-close curved brackets just after the command, and put your text inside them ● (^) Something like this: ● (^) System.out.print(Hello World)
● (^) In Java, we put the semicolon after every command. ● (^) Just like we use the full stop after every statement in English, we use the semicolon to end every command in Java. ● (^) So the final command will look something like this: ● (^) System.out.print("Hello World"); ● (^) put the semicolon after every command. ● (^) Now RUN the program to get output.