java - 方法的重复

Question

如果我想重复该方法，如果没有输入 yes 或 no，我该怎么做？我尝试过:

while (!answer.equals("yes") && !answer.equals("no")) {

但它只是一直输入“请回答是或否”，而没有提供再次写入的选项。

谢谢

import acm.program.*;

public class YesOrNoQuestion extends ConsoleProgram {
	public void run() {
		println("This program asks you whether you want instructions");
		String answer = readLine("Type your answer here: ");
		YesOrNo(answer);
	}

	private void YesOrNo(String answer) {
		if (answer.equals("yes")) {
			println("Alright here you go");
		} if (answer.equals("no")) {
			println("Alright fine");
		} else println("Please type either yes, or no: ");
		
	}
}

Answer 1

• 您缺少else if!!
  
• 此外，使用 String::toLowerCase() 将用户输入转换为小写得到NO、nO、No和no。
• 要在控制台中打印，请使用 System.out.println()

private void YesOrNo(String answer) {
    if (answer.toLowerCase.equals("yes")) {
        System.out.println("Alright here you go");
    } else if (answer.toLowerCase.equals("no")) {
    //↑ here!!!
        System.out.println("Alright fine");
    } else {
        System.out.println("Please type either yes, or no: ");
        run();
    }

}