do-while循环中变量的范围 [英] Scope of variable inside do-while loop

问题描述

如果用户在程序末尾提示时输入 y或 Y，我试图遍历整个程序，但出现找不到符号-变量响应错误由于我声明的变量位于do-while循环内，因此我想我不能在do-while循环的条件下使用它。如果用户输入 y或 Y，有什么方法可以解决此问题，并且仍然可以遍历该程序？这一切都在main方法中，而getFileRunStats是包含程序中所有其他方法的方法。

I'm trying to loop through an entire program if the user inputs "y" or "Y" when they are prompted at the end of the program, but I'm getting a "cannot find symbol - variable response" error since the variable I declared is inside the do-while loop, therefore I suppose I can't use it in the condition of the do-while loop. Is there any way to get around this problem and still be able to loop through the program if the user inputs a "y" or "Y"? This is all in the main method and getFileRunStats is the method that contains all other methods from the program.

以下是相关代码：

public static void main(String[] args) throws IOException {
    System.out.println("A program to analyze home field advantage in sports.");
    System.out.println();        
    Scanner keyboard = new Scanner(System.in);

do{   
    getFileRunStats(keyboard);

    System.out.println("Do you want to check another data set?");
    System.out.print("Enter Y or y for to analyze another file, anything else to quit: ");
    String response = keyboard.nextLine();
}while(response == "Y" || response == "y");


}

推荐答案

您可以删除该语句，并将其添加到循环条件中。

You can just remove the statement, and add it to the loop condition.

do {
} while (keyboard.nextLine().equalsIgnoreCase("y"));

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