爲什麼我的while循環條件不起作用？

Question

當我嘗試使用while循環時，它不會遵循我在此設置的條件。就好像我把while s1 != "n")它會繼續，即使s1 = n。當我嘗試使用while s1 == "y")時，情況正好相反，它非常刺激。我試圖製作一個因子計算器，提示用戶是否想要繼續或停止。

下面是完整的代碼：

package factorial; 

import java.util.Scanner; 

public class Factorial { 

    public static void main(String[] args) { 
    int factorial = 1; 
    int number = 6; 
    int i = 1; 
    String s1 = "y"; 

    Scanner keyboard = new Scanner(System.in); 

while(s1 != "n") { 
    System.out.println("Enter an N:"); 
    number = keyboard.nextInt(); 
    while(i <= number) { 
     factorial *= i; 
     i++; 
    } 
    System.out.println("Factorial = "+factorial); 
    System.out.println("Would you like to continue? (y/n)"); 
    s1 = keyboard.next(); 
} 
keyboard.close(); 
System.out.println("Have a nice day!"); 
} 
} 

Answer 1

由於@Debabrata說使用等於字符串，替換：

while(s1 != "n") { 

與

while(!s1.equals("n")) {