Hello World Without an IDE

They say the only way to teach a fish about water is to remove the fish from the water. So in the time honored tradition of writing “Hello World!” (whenever you learn a new computer language), lets try. We need to type the following Java code as a text file. Java requires that the File name is Capitalized, and ends in .java. Link to Video

1. Type the code as a text file

Linux / MacOS

nano First.java

There is a remote possibility nano needs to be installed

DOS / Windows before Win7-64 bit

edit First.java

Windows 7-64 bit and later

notepad First.java (technically not a command line editor, but they removed that ability for some reason)

Now (in your respective editor) type:

public class First 
{
	public static void main(String[] args) 
	{
		System.out.println("Hello World!");
	}
}

2. Compile the Code

javac First

3. Execute the Code

java First

Summary

Doing this once usually ends with the response “There must be a better way!” Now you will appreciate any IDE, and there are many, but we will focus on two: BlueJ and Eclipse.

Recommended reading: Java Methods (4th ed) Chapter 2

APCS: AP Computer Science A @sfhs

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