Java Chapter 19 - Bells & Whistles

19.1 Java Colors on Windows 10 and macOS.

You may use ANSI escape sequences to add colored text on Windows 10 Command Prompt and macOS Terminal.

For newer versions of macOS, you shouldn't have to configure anything for them to work.

For Windows 10, you may need to enable the ANSI escape sequences since they are disabled by default.  It can be enabled with the following registry modification (run from the command prompt as administrator):
reg add HKEY_CURRENT_USER\Console /v VirtualTerminalLevel /t REG_DWORD /d 0x00000001 /f

The following article also covers Windows escape sequences in more detail:  How to Put Color on Windows Console
 

Java Console Colors on Windows & Mac 
import java.util.*;
public class colors
{
    static String CLS = "\033[2J\033[1;1H";
    static String Default = "\033[0m"; // default gray color & reset background to black
    static String Red = "\033[31;1m";
    static String Pink = "\033[38;5;213m";
    static String Green = "\033[32;1m";
    static String SeaGreen = "\033[38;5;158m";
    static String Yellow = "\033[33;1m";
    static String Navy = "\033[34;1m";
    static String Blue = "\033[38;5;117m";
    static String Cyan = "\033[36;1m";
    static String Purple = "\033[35;1m";
    static String Orange = "\033[38;5;208m";
    static String Coral = "\033[38;5;204m";
    static String White = "\033[37;1m";

    static String WhiteOnRed = "\033[41;1m";
    static String WhiteOnGreen = "\033[42;1m";
    static String WhiteOnYellow = "\033[43;1m";
    static String WhiteOnBlue = "\033[44;1m";
    static String WhiteOnPurple = "\033[45;1m";
    static String WhiteOnCyan = "\033[46;1m";

    public static void main (String[] args)
    {
        System.out.println(Default + " Default " + White + "White " + Red + "Red " + Pink + "Pink " + 
                           Green + "Green " + SeaGreen + "SeaGreen " + Yellow + "Yellow ");
        System.out.println(Navy + " Navy " + Blue + "Blue " + Cyan + "Cyan " + Purple + "Purple " + 
                           Orange + "Orange " + Coral + "Coral ");

        System.out.println(Default + WhiteOnRed+" White on Red "+WhiteOnGreen+" White on Green "+WhiteOnYellow+" White on Yellow ");
        System.out.println(WhiteOnBlue+" White on Blue "+WhiteOnPurple+" White on Purple "+WhiteOnCyan+" White on Cyan ");
        System.out.print(Default);  // reset background to black after printing inverse colors
    }
}
 Default White Red Pink Green SeaGreen Yellow
 Navy Blue Cyan Purple Orange Coral
 White on Red  White on Green  White on Yellow
 White on Blue  White on Purple  White on Cyan


19.2 Audio

The code below implements the playSound method to play an audio file.  It only works with .wav audio files.  The audio stops if your program ends.  This will not work using an online compiler.

Java Audio 
import java.io.*;
import javax.sound.sampled.*;
public class audio
{
	public static void main(String[] args) throws IOException
	{
		playSound("starwars.wav");  // only works with .wav sound files
		while(true);    // added infinite loop because sound stops when program ends
	}

	public static void playSound(String songname)
	{
		try
		{
			AudioInputStream audioInputStream = 
				AudioSystem.getAudioInputStream(new File(songname).getAbsoluteFile());
			Clip clip = AudioSystem.getClip();
			clip.open(audioInputStream);
			clip.start();
		}
		catch(Exception ex)
		{
			System.out.println("Error with playing sound.");
			ex.printStackTrace();
    		}
	}
}