mithran2.md

Hi team! Today, we will learn how to make our game talk to players and make smart choices.

Plan for Today:

• Methods: Scanner for nextInt(), Scanner for nextLine(), if-else if-else statements, nested if statements
• Stretch: String methods like .trim() or .toLowerCase()

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• Scanner for nextInt()

  • int num = input.nextInt();
  • This is like asking "How many?" and waiting for a number from you.
  • You will type a number, and the computer will save it.
  • This helps your game get numbers, like how many soldiers to train.

• Scanner for nextLine()

  • String word = input.nextLine();
  • This is like asking "What is your name?" and waiting for words.
  • You will type words, and the computer will save them.
  • This helps your game get words, like a player's name or a command.

• if-else if-else statements

  • if (score > 10) { ... } else if (score == 10) { ... } else { ... }
  • It's like saying: "If it's sunny, play outside. ELSE IF it's cloudy, read a book. ELSE, watch TV."
  • Your program will do only one of these actions.
  • This helps your game pick the right path based on what players do.

• nested if statements

  • if (level > 5) { if (coins > 100) { ... } }
  • It's like saying: "IF you are big, THEN IF you have money, you can buy a toy."
  • This lets your game make a choice inside another choice.
  • This makes your game's choices extra smart.

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• Stretch — String methods like .trim() or .toLowerCase()
  • String cleanWord = word.trim().toLowerCase();
  • This is like cleaning up messy writing and making all letters small. " HELLO " becomes "hello".
  • The words you type will be neat and easy for the computer to understand.
  • This helps your game understand player commands better, even if they type " Go " or "GO".

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Your Turn!

Let's build a small game piece by piece.

1. Start a new file. Make a new file called MyGame.java.

   import java.util.Scanner;
   public class MyGame {
       public static void main(String[] args) {
           // We will add more code here!
       }
   }

2. Get a number. Inside main, let's ask for a number.

   Scanner input = new Scanner(System.in);
   System.out.println("Type a number (1 or 2):");
   int choice = input.nextInt();
   input.nextLine(); // Fix for nextLine after nextInt

   • If you run it now, it will ask for a number and then stop.

3. Get some words. Next, let's ask for a name.

   // ... after getting choice
   System.out.println("Type your name:");
   String name = input.nextLine();

   • Now it asks for a number, then a name.

4. Clean up words (Stretch!). Make the name neat.

   // ... after getting name
   String cleanName = name.trim().toLowerCase();

   • Now cleanName will be like "hero" even if you typed " HERO ".

5. Make choices! Use if-else if-else to react to the number.

   // ... after cleanName
   if (choice == 1) {
       System.out.println("You picked option 1.");
       // We will add more inside this if!
   } else if (choice == 2) {
       System.out.println("You picked option 2.");
   } else {
       System.out.println("Not a valid choice.");
   }
   input.close(); // Don't forget this!

   • Run it. Type 1 or 2 or something else to see the different messages.

6. Add a smart choice (Nested if!). Inside the choice == 1 part, check the name.

   // ... inside the if (choice == 1) { ... } block
   if (cleanName.equals("hero")) {
       System.out.println("Welcome, Hero!");
   } else {
       System.out.println("Hello, player!");
   }

   • Now run it. Type 1 for the number. Then type HERO (with spaces or big letters) for the name. You should see "You picked option 1. Welcome, Hero!"

Why are choices important in a game?