java - if 语句没有采用我的字符串值并将它们评估为 boolean 值(java初学者问题)

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已关闭。这个问题是 not reproducible or was caused by typos 。目前不接受答案。

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这个问题是由拼写错误或无法再重现的问题引起的。虽然类似的问题可能是 on-topic在这里，这个问题的解决方式不太可能帮助 future 的读者。

已关闭 6 年前。

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//程序总是打印if语句中写入的行。 //此外，每次我尝试添加 else 语句时 eclipse 都会返回错误

import java.util.Scanner;
import java.util.Arrays;
public class Practice {

public static void main(String[] args)


Scanner input = new Scanner(System.in);
System.out.println("Enter the number of artists you would like to search: ");
int number = input.nextInt();
String junk = input.nextLine();
String []artist = new String[number];

for(int i=0; i < number ; i++)
{
    artist[i]= input.nextLine();
}
System.out.println("Here is the list of artists you searched for: " + Arrays.toString(artist) + ". Is this correct?");

String check = input.nextLine();
if((check.equalsIgnoreCase("yes") || check.equalsIgnoreCase("y")) == false); //this continually returns both print statements in and out of the if statement even if I input something other than yes or y and I have no idea why
{
    System.out.println("Cool! Enjoy your search!"); //this always prints no matter what
} 

System.out.println("Please try again! Sorry for the inconvenience!"); //won't let me add an else statement

Answer 1

条件末尾有一个悬空的 ;

if((check.equalsIgnoreCase("yes") || check.equalsIgnoreCase("y")) == false) // ; was here
{

}

删除它。这称为空语句。您可以将其重写为

if((check.equalsIgnoreCase("yes") || check.equalsIgnoreCase("y")) == false)
    ; 

{
    System.out.println("Cool! Enjoy your search!"); //this always prints no matter what
} 

由于 block {/* ... */} 是有效代码，因此无论如何它都会被执行。