如何使用扫描仪 class 使用 java 回答字符串问题？

Question

I have been trying all weekend to find a way to get my program to answer a question using a sting with a scanner class. For example I need to get my program to answer a question like

Who is on the 5 dollar bill?

Input would be Lincoln and other inputs would be invalid the question will have 3 choices so the logic has to work.

Can you point me in the right direction on how to get this to work in Java? I want to understand the material but I have really tried all weekend.

Answer 1

If I understood your question properly, then this should point you in the right direction:

Import the Scanner:

import java.util.Scanner;

Then, here is the method you'd want to call:

public void myScanner () {
     Scanner scan = new Scanner(System.in); //Creates a new scanner
     System.out.println("Who is on the 5 dollar bill?"); //Asks question
     String input = scan.nextLine(); //Waits for input
     if (input.equalsIgnoreCase("Lincoln")) { //If the input is Lincoln (or any case variant of Lincoln)
          System.out.println("Correct!");
     }
     else { //If the input is anything else
          System.out.println("Incorrect!");
     }
}

Answer 2

If you don't want to encode all the actual word solutions (like "Lincoln") you can also just ask the user to pick a number/letter solution since you only have 3.

 Scanner input = new Scanner(System.in);
 System.out.println("Who is on the 5 dollar bill?  1. Lincoln 2. Somebody 3. Someone");
 String userChoice = scan.nextInt();    //get a number from user
 if(userChoice == 1)
       System.out.println("Correct answer!");
 else
       System.out.println("Wrong answer!");

This would make it easy to keep track of the answer key.

Answer 3

Scanner input = new Scanner(System.in);
     System.out.println("Who is on the 5 dollar bill?");
     String userinput = input.nextLine();    //get a name from user
     if(userinput.equalsIgnoreCase("Lincoln"))
          { System.out.println("Answer is correct");}
     else
          { System.out.println("Answer is wrong");}
}}