how softwares are made entirely from scratch

Question

Plz suggest some projects that i could do

Answer 1

color picker. good first project, I learned a lot of different GUI things making it.

button click listener
frames
panels
canvas
sliders
radio button
input boxes
writing and reading to files
mouse listener
popup message

http://leakyegg.website.tk/RGB.zip

Quite simple, but alot was learned making it

Answer 2

After the ideas from Dirty Joe, you could try using random numbers for a guessing game, rolling dice, working with images and if you are feeling confident somewhere along the line, try accessing and showing data from a database.

Think of a problem, e.g. a simple calculator, and try to program it, either using the GUI Swing interface or just using the standard textual interface.

You could also try to calculate someone's age given their birth date, or work out if a particular year is a leap year, or read a text file and writ it to another file. There are so many things you can do to start.