Question

因此，对于我的代码的最后一部分，我试图根据用户正确的问题数量发表评论。如果用户有3个或更多正确，我想留下恭喜。但是如果用户得到的比较少，我想留下评论来研究一下。我知道我应该使用关系运算符来解决这个问题，但我对如何实际操作感到困惑。

import java.util.Scanner; 

public class quizcreation
{
   public static void main (String [] args)
   {
   Scanner input = new Scanner (System.in);

   System.out.println ("If your answer is not one of the options, it will be considered incorrect.");
   System.out.println();

   //Question 1
   System.out.println ("T/F: Harry Potter was an only child.");
   String answer1 = input.next();

   if (answer1.equals("True"))
   {
      System.out.println("That is correct! Harry was an only child.");
      }   

   else if (answer1.equals("true"))
   {
      System.out.println("That is correct! Harry was an only child.");
      }
   else if (answer1.equals("TRUE"))
   {
      System.out.println("That is correct! Harry was an only child.");
      }
   else if (answer1.equals("t"))
   {
      System.out.println("That is correct! Harry was an only child.");
      }

   else if (answer1.equals("T"))
   {
      System.out.println("That is correct! Harry was an only child.");
      }

   else 
   {

      System.out.println("Sorry that is incorrect. Harry was an only child.");
    } 

   System.out.println();

   //Question 2
   System.out.println ("T/F: Ron Weasley has more than one brother.");
   String answer2 = input.next();

   if (answer2.equals("True"))
   {
      System.out.println(" 100% correct! Ron has 2 twin brothers.");
      }
   else if (answer2.equals("true"))
   {
      System.out.println("100% correct! Ron has 2 twin brothers.");
      }

   else if (answer2.equals("TRUE"))
   {
      System.out.println("100% correct! Ron has 2 twin brothers.");
      }
   else if (answer2.equals("t"))
   {
      System.out.println("100% correct! Ron has 2 twin brothers.");
      }
   else if (answer2.equals("T"))
   {
      System.out.println ("100% correct! Ron has 2 twin brothers.");
      }
   else 
   {
      System.out.println ("Sorry that is incorrect. Ron has 2 twin brothers.");
      }
   System.out.println();   

   //Question 3
   System.out.println("What was the first name of Harry's uncle?");
   System.out.println("a) Remus");
   System.out.println("b) Snape");
   System.out.println("c) Sirius");

   String answer3 = input.next();

   if (answer3.equals("a"))
   {
      System.out.println ("Sorry that is incorrect. ");
      }

   else if (answer3.equals ("A"))
   {
      System.out.println ("Sorry that is incorrect.");
      }

   else if (answer3.equals ("b"))
   {
      System.out.println ("Sorry that is incorrect. ");
      }

   else if (answer3.equals("B"))
   {
      System.out.println ("Sorry that is incorrect. ");
      }

   else if (answer3.equals ("C"))
   {
      System.out.println ("That is correct! ");
      }

   else if (answer3.equals ("c"))
   {
      System.out.println ("That is correct! ");
      }

   else 
   {
      System.out.println ("THAT WASN'T EVEN AN OPTION YO. This is incorrect.");
      }
   System.out.println();   

   //question 4

   System.out.println("What is the name of one of the houses at Hogwarts");
   String answer4 = input.next();

   if (answer4.equals("Gryffindor"))
   {
      System.out.println ("You are correct! Students from Gryffindor are known for their bravery.");
      }

   else if (answer4.equals("gryffindor"))
   {
      System.out.println("You are correct! Students from Gryffindor are known for their bravery.");
      }
   else if (answer4.equals("Slytherin"))
   {
      System.out.println( "You are correct! Slytherin are known for being cunning and ambitious.");
      }
   else if (answer4.equals("slytherin"))
   {
      System.out.println(" You are correct! Slytherins are known for being cunning and ambitious.");
      }
   else if (answer4.equals("Ravenclaw"))
   {
      System.out.println("You are correct! Ravenclaws are known for their intelligence.");
      }
   else if (answer4.equals("ravenclaw"))
   {
      System.out.println("You are correct! Ravenclaws are known for their intelligence.");
      }
   else if (answer4.equals ("Hufflepuff"))
   {
      System.out.println("You are correct! Hufflepuffs are known for their kindness.");
      }
   else if (answer4.equals ("hufflepuff"))
   {
      System.out.println("You are correct! Hufflepuffs are known for their kindess.");
      }
   else 
   {
      System.out.println(" Sorry that is incorrect :(");
      }
   }
}

Answer 1

您可以在

行的代码顶部声明一个变量

int correct = 0;

然后，一旦进入您的正确答案之一，请通过向其添加一个来更新变量，即correct++;

然后在代码的底部，输入一个新的if语句。

if (correct >= 3) {
            //message here
        } else {
            //other message
        }

您还可以使用equalsIgnoreCase和||（或）

大幅缩短代码

例如：

if (answer1.equalsIgnoreCase("True") || answer1.equalsIgnoreCase("T")) {
            System.out.println("That is correct! Harry was an only child.");
            correct++;
        } else {
            System.out.println("Sorry that is incorrect. Harry was an only child.");
        }

Answer 2

首先，我建议您使用equalsIgnoreCase方法比较Strings，以避免丑陋的多重equals。您可以阅读更多相关信息in the official documentation。

此外，要确定正确答案的数量，请使用简单的int变量。对于每个正确的响应，递增它。最后，根据计数器最终值的值做出决定。

这是您的代码的简化版本：

Scanner input = new Scanner(System.in);
int correctAnswersCounter = 0;

System.out.println("If your answer is not one of the options, it will be considered incorrect.");
System.out.println();

//Question 1
System.out.println("T/F: Harry Potter was an only child.");
String answer1 = input.next();

// equalsIgnoreCase() works for all variations like 'true', 'TRUE', 'TrUe', 'truE' etc. for example

if (answer1.equalsIgnoreCase("true") || answer1.equalsIgnoreCase("t")) {
    System.out.println("That is correct! Harry was an only child.");
    correctAnswersCounter++;
} else {
    System.out.println("Sorry that is incorrect. Harry was an only child.");
}

System.out.println();

//Question 2
System.out.println("T/F: Ron Weasley has more than one brother.");
String answer2 = input.next();

if (answer2.equalsIgnoreCase("true") || answer2.equalsIgnoreCase("t")) {
    System.out.println(" 100% correct! Ron has 2 twin brothers.");
    correctAnswersCounter++;
} else {
    System.out.println("Sorry that is incorrect. Ron has 2 twin brothers.");
}
System.out.println();

//Question 3
System.out.println("What was the first name of Harry's uncle?");
System.out.println("a) Remus");
System.out.println("b) Snape");
System.out.println("c) Sirius");

String answer3 = input.next();

if (answer3.equalsIgnoreCase("a")) {
    System.out.println("Sorry that is incorrect. ");
} else if (answer3.equalsIgnoreCase("b")) {
    System.out.println("Sorry that is incorrect. ");
} else if (answer3.equalsIgnoreCase("c")) {
    System.out.println("That is correct! ");
    correctAnswersCounter++;
} else {
    System.out.println("THAT WASN'T EVEN AN OPTION YO. This is incorrect.");
}
System.out.println();

//question 4

System.out.println("What is the name of one of the houses at Hogwarts");
String answer4 = input.next();

if (answer4.equalsIgnoreCase("Gryffindor")) {
    System.out.println("You are correct! Students from Gryffindor are known for their bravery.");
    correctAnswersCounter++;
} else if (answer4.equalsIgnoreCase("Slytherin")) {
    System.out.println("You are correct! Slytherin are known for being cunning and ambitious.");
    correctAnswersCounter++;
} else if (answer4.equals("Ravenclaw")) {
    System.out.println("You are correct! Ravenclaws are known for their intelligence.");
    correctAnswersCounter++;
} else if (answer4.equals("Hufflepuff")) {
    System.out.println("You are correct! Hufflepuffs are known for their kindness.");
    correctAnswersCounter++;
} else {
    System.out.println(" Sorry that is incorrect :(");
}

// now make a decision based on the value of correctAnswersCounter
if(correctAnswersCounter > 3) {
    System.out.println("Congrats!");
}
else {
    System.out.println("Try harder next time!");
}

使用关系运算符查找分数

2 个答案: