[Introduction to Java] Complete guide to making a number guessing game | Explanation with code for beginners

programming

"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?

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:

  • ScannerbyUser Input
  • RandombyRandom Number Generation
  • If StatementbyConditional branching
  • while statementbyIteration

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

To generate a random number

1
100) + 1;

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."

  1. Choose the correct answer between 1 and 100
  2. Receive a number from the player
  3. Compare with the answer and display "bigger, smaller, correct"
  4. If the answer is correct, the game ends. If the answer is incorrect, the game repeats.

This flowwhileBy expressing it in a sentence,Simple and practical logicIt will be.

Completed code for Java number guessing game

1
100) + 1 0; 0); ); } ); }

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:

  • whileUse "!=" correctly in the condition expression
  • nextInt()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 Statementorwhile statementAble to practically understand
  • Deepen your understanding of input and conditional expressions
  • There is room for self-application and improvement
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