Question

我正在为一个学校作业编写一个程序来创建一个包含3个谜语的字符串数组，并为每个谜语创建另一个3个答案的字符串数组。但是当我输入正确的答案时，它会继续显示if-else语句的else部分。这是我的代码：

import java.util.Scanner;
import java.util.Random;
public class riddleProgram {
public static void main (String[]args) {
Scanner input = new Scanner(System.in);
Random rand = new Random(); 
int index;
int chosenRiddles = rand.nextInt(2); 

//declares the riddles in the program as well as choosing a random riddle from the three presented
String[]riddle = new String[3]; 
riddle[0] = "What starts with a T, ends with a T, and has T in it?";
riddle[1] = "The day before two days after the day before tommorrow is Saturday. What day is it today?";
riddle[2] = "What grows up while growing down?";

//declares the answers to the riddles
String[]answer = new String[3];
answer[0] = ("teapot"); 
answer[1] = ("friday");
answer[2] = ("goose");

//asks user to enter guessed answer for the randomly presented riddle
for (index=0; index<3; index++); {
  System.out.println(riddle[chosenRiddles]);
  System.out.print("Enter your answer for the presented riddle (lowercase): ");
  String inputtedAnswer = input.nextLine(); 

 //if user inputs right answer, congratulates user
 //if user inputs incorrect answer, tells user the correct answer
  if (inputtedAnswer == answer[chosenRiddles]) { 
    System.out.println("Congratulations, you have gotten the right answer!"); }
  else {
    System.out.println("Sorry you had the wrong answer. The right answer is " + answer[chosenRiddles] + ".");}
} 
} 
}

Answer 1

永远不要将字符串与==

进行比较

你应该总是使用.equals（）

if (answer[chosenRiddles].equals(inputtedAnswer)) {

您还应该尝试在这些值的左侧使用常量值（将始终存在的值），以防止可能的NullPointerExceptions。

在评估字符串时，Else-if语句无法正常工作

1 个答案: