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i dont do java, but you could just play around, make random codes about your day, something in your life, the time it would take for a car going x amount to cover x distance, idk things likt that. remember, even though creating cool codes that other people like and getting followers is super fun, the main goal is really to learn how to code. and practise will get you just lots of experience.
how about a program to find missing numbers in a list? a program to sort a list? generate passwords? a program to store program ideas? Games - Dice, BlackJack, hangman