"I've just started learning Java, but I don't know how to use if statements or while statements."
"I want to know about apps that are easy, fun, and game-like to create."
This is perfect for such people.Creating a number guessing game.
In this game,The simple rule is to guess random numbers.Using
JavaConditional branching, repetitive processing, variable handling, user input processingYou can learn all at once.
In this article, we will explain how to do it so that even beginners can easily do it.Careful explanation from the basics to finished codeI will do it.
- What is a numbers guessing game?
- Preparation of syntax required in Java
- Considering the processing structure of a number guessing game
- Completed code for Java number guessing game
- Common mistakes and points to improve
- Let's try some applied tasks!
- Completed code summary
- Summary: Best learning materials for Java beginners
What is a numbers guessing game?
A fun and fun Java practice app
Bottom line: Random number guessing games are great for practicing conditionals and repetition.
A number guessing game is a game where you guess the correct number, which is randomly chosen from a range such as 1 to 100.
This is a game where players repeatedly input numbers to guess.
For example, it works as follows:
- The program will select a random number (e.g. 57)
- Player enters a number (e.g. 30 → "it's bigger")
- Repeat until correct
This app teaches you the following Java elements:
Scanner
byUser InputRandom
byRandom Number GenerationIf Statement
byConditional branchingwhile statement
byIteration
Preparation of syntax required in Java
Let's understand input processing and random number processing
Conclusion: with Scanner and Random classes we are ready to go.
First let's understand the basic syntax.
To receive input from the user
1 |
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To generate a random number
1 |
100 ) + 1 ;
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By combining these, you can create a flow of "Player enters a number → Check if it is correct → Display hint → Continue."
Considering the processing structure of a number guessing game
In what order should I write the code?
Conclusion: First "decide the answer," then "repeatedly input and judge."
- Choose the correct answer between 1 and 100
- Receive a number from the player
- Compare with the answer and display "bigger, smaller, correct"
- If the answer is correct, the game ends. If the answer is incorrect, the game repeats.
This flowwhile
By expressing it in a sentence,Simple and practical logicIt will be.
Completed code for Java number guessing game
1 |
100 ) + 1
0 ;
0
);
); }
); }
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Common mistakes and points to improve
When the program stops or the loop doesn't work
Conclusion: There are many errors in conditional expressions and input types.
Please pay attention to the following points:
while
Use "!=" correctly in the condition expressionnextInt()
If an exception occurs, check if you have not entered a string.scanner.close()
is used only once at the end
Also,If you want to change the rangewould be as follows:
1 |
50 ) + 51 ;
|
Let's try some applied tasks!
Adding more practical features can take it to the next level
Recommended additional features:
- Added an error message for values outside the input range
- Display "rating" according to the number of hints given
- Enter player name + retry function
Completed code summary
File name: GuessingGame.java
1 |
100 ) + 1
0 ;
0
);
); }
); }
|
Summary: Best learning materials for Java beginners
The number guessing game isFun exercises to learn the basics of Javais.
If Statement
orwhile statement
Able to practically understand- Deepen your understanding of input and conditional expressions
- There is room for self-application and improvement